- 1-line telephone status indicator powered from a 3V battery (PDF)
- 4-line telephone status indicator that is polarity independent (PDF)
- 8-line intercom system using 89C51 microcontroller
- 900MHz cordless phone bug
- Assorted telephone circuits (ring generator, in-use indicator, audio interface)
- Audio Visual Indicator for Telephones
- Caller ID decoder (requied Postscript file viewer and/or Ordcad schematic capture)
- Cellular Phone calling Detector
- Cellular Phone calling Detector
- Cellular Phone calling Detector
- Cellular Phone calling detector (detects RF field)
- Cordless phone backup power source using LM317L
- Cut Phone Line Detector
- Cut Phone Line Detector
- Cut Phone Line Detector
- Cut phone line detector
- Cut telephone line detector
- Detecting a telephone ring signal
- Digisound ring modulator
- Digital/Standard Phone Line Tester
- DSL / ADSL phone line filter
- FM Telephone Bug
- FM Telephone Bug
- FM Telephone Bug
- FM telephone line bug transmitter (88MHz to 94MHz)
- Greek telecard reader
- High Quality Intercom using LM380 amplifier IC
- Hold function for Telephone
- Home made PBX / PABX
- Incoming call indicator (ZIP file)
- Infinity bug for remote telephone surveillance
- Isolated Telephone Interface
- Isolated Telephone Interface (phone tap) for tape recorder, PC sound card etc
- Line in use indicator that handles two independent phone lines (PDF)
- Low cost intercom using transistors
- Off line Telephone tester
- Phone "Hold" With Music
- Phone Broadcaster / telehone bugging device circuit diagram
- Phone Busy Indicator
- Phone Busy Indicator
- Phone Busy Indicator
- Phone In Use Indicator circuit diagram
- Phone in-use (manually activated)
- Phone In-Use Light
- Phone line in use indicator
- Phone line indicator
- Phone line to audio interface
- Phone Off-Hook Indicator using CD4049 hex inverter
- 'phone rang' indicator light
- Phone ring circuit schematic using a piezo buzzer for sound output
- Phone to audio interface for SSI202 input
- Phone-In-Use indicator
- Remote Telephone Bell Ringer
- Ringing Phone Light Flasher
- Ringing Phone Light Flasher
- Ringing Phone Light Flasher using optocoupler and relay
- Simple alarm with telephone dialler interface
- Simple circuit to connect telephone equipment to audio mixer
- Simple intercom
- Simple Phone Tap
- Simple Phone Tap Circuit
- Simple Phone Tap circuit diagram
- Simple Skype VoIP analog adapter
- Simple speakerphone
- Simple telephone line tap for intercepting telephone calls
- Smart Phone light
- Soft Musical Telephone Ringer
- Soft musical telephone ringer
- Talking phone dial monitor (PDF)
- Taxi phone automatic dialler
- Telephone amplifier
- Telephone amplifier
- Telephone auto-dialler (useful for an alarm dialler)
- Telephone Hold Button
- Telephone Hold Button
- Telephone Hold Button circuit
- Telephone in use light
- Telephone Line Filter / Protector
- Telephone Line Monitor
- Telephone line monitor
- Telephone line monitor
- Telephone line simulator
- Telephone music on hold interface
- Telephone privacy adapter
- Telephone Record Control using 2N4360, 2N2222 and 2N2102
- Telephone Recorder
- Telephone Recorder
- Telephone recorder to record phone conversations automatically
- Telephone ringing circuits
- The 89C51 PABX
- The Link 4+0 - Internal Intercom (Doesn't offer external line access)
- The Link A2B+1 (the Link Telephone Intercom - DTMF version)
- The Original 2 Phone Intercom Link Design
- Universal telephone hold
- Use old telephones as an intercom
- Wireless Telephone Bug
Sunday, April 4, 2010
Telephone & Intercom related schematics
Posted by B.Tech Live projects for ECE,EEE,EIE,ICE at 5:15 AM 0 comments
Test Equipment & Circuit schematics
- 10Hz - 100KHz D.D.S. Function Generator
- 2.5 GHz Frequency counter
- -20 dB Couplers for use with a with a spectrum analyzer or other sensitive detector
- -20 dBm, 14.060 MHz Precision Signal Source
- 220V live wire-in-wall scanner
- 250MHz RF Generator with 1kHz display resolution
- 3 in one tester (audio, tone generator, diode/circuit tester)
- 555 go / no-go tester
- 555 Timer IC Tester
- 5Hz to 500KHz frequency meter
- AD9850 DDS daughterboard
- Alarm circuit to remind you to turn off your DMM (digital multimeter)
- Audible Logic Probe based on LM339 operational amplifier
- Audio Millivoltmeter
- Audio Test Oscillator
- Automatic heat limiter for soldering iron
- Battery Tester for 1.5 and 9V
- BCD readout frequency counter
- Beeper to find short circuits
- Beeper to find short circuits (continuity tester)
- Build an inexpensive Hall effect Gaussmeter
- Capacitance meter
- Capacitance meter - precision meter for small capacitors
- Capacitance meter that connects to multimeter
- Connection tester for checking solder joints and other connections
- Conrad Electronics MM3610D multimeter cable pinout
- Contactless Mains Voltage Indicator
- Contactless Mains Voltage Indicator
- Continuity tester
- Continuity tester
- Continuity tester 2
- Continuity Tester based on 4 x 2N3904 and 1 x 2N3905 transistors
- Continuity tester using transistors
- Crystal tester
- Crystal tester that covers a range of 32kHz to 24MHz
- DCC Ammeter using ZXCT1009 current monitor
- DDS from 1-60 MHz with built-in amplifier and variable output level using Analog Devices AD9851
- Design for a slightly more expensive Gaussmeter
- Digital SWR / Power Meter
- Digital voltmeter (DVM)
- Digital Voltmeter using ICL7107
- Digital Wattmeter, measures from nanowatts to kilowatts using AD8307, PIC16F876, LCD Display
- Dip Oscillator for HF
- Distortion Analyser
- Elecraft XG2 receiver test oscillator (PDF)
- Electric field & leakage detector
- Electronic Circuit for Crystal Parameter Measurement
- EMF field probe (electromagnetic field probe) covering up to 100kHz
- ESR Meter
- Exclusive 2.5 GHz Frequency Counter with Blue 2x16 LCD display
- Field Strength Meter (FSM) covers 2Mhz - 1Ghz with peak reception at 3-200Mhz
- Field strength meter for the 137 kHz band
- Fixed Frequency "Tuner Dipper"
- Fluke 8010 / 8012 Interface
- Frequency and capacitance meter
- Frequency Counter / Timer / Logic Tester
- Frequency counter measures to 2.5 GHz and offers LCD display
- Full Featured Transistor Tester
- Function generator based on 555 timer and three 2N2222 transistors
- Function generator based on 8038PCD function generator IC
- Function generator based upon 8038 waveform generator IC
- Grid dip meter
- Ground Fault Indicator
- Heathkit signal generator user manual and circuit diagram
- High Impedance Voltmeter
- High Resistance Voltmeter
- Homebrew signal generator tunable from 3 to 30 Mhz
- Improved DCC Ammeter (2009) using Zetex ZXCT1009 current monitor
- In-circuit electrolytic capacitor checker
- In-circuit electrolytic capacitor tester
- Inductive meter adapter to measure inductance using a frequency counter
- Latching Continuity Tester to help find intermittent faults, has quite a few innovative features
- Latching continuity tester using 4093
- LC meter with LCD display for readout
- LCD Frequency Counter
- LCD frequency counter (PIC16F84)
- Led display digital Voltmeter using ICL7107
- Line Output / Flyback transformer tester
- Linear Resistance Meter
- Linear Resistance Meter
- Linear scale analog watt meter / RF power meter
- Live line detector
- Logic probe
- Logic probe
- Logic probe based on CMOS 4001 chip
- Logic probe with 7-segment display based on 74LS00 and 74LS47
- Logic probe with pulser
- Low Power Antenna Analyzer and ATU Tuning Aid
- Low-Cost Phase Noise Measurement
- Microphone Circuit Test Oscillator
- Mini DDS (direct digital synthesizer) using an Analog Devices AD9832 (12MHz maximum frequency)
- Mini tester: Handles continuity testing, resistor testing, capacitor testing and diode testing
- Miniscope - simple all-valve 1-inch CRT oscilloscope
- MOSFET tester for N-type MOSFET transistors
- MOSFET transistor tester
- Multi wire cable tester that handles up to eight conductors
- Multi-trace scope display that allows up to 4 channels to be viewed on a single oscilloscope channel
- Opamp Design and Test Board
- Optical ballistic chronograph for measuring projectile velocity
- Oscillopscope triggering circuit for recording long transients at fast sweep speeds (PDF)
- Oscilloscope testing module (huntron circuit)
- Oscilloscope testing module (Huntron circuit) that shows Lissajous patterns
- Panel Mounting Radio Frequency Counter
- PCB board tester and RF detector circuir diagrams
- PCB VSWR bridge
- Philips SB-6668 frequency counter upgrade
- PIC based frequency counter
- PIC logic probe with pulser
- PIC16F84 based diode tester
- Picoammeter circuit schematic with 4 ranges using CA3420
- Pink Noise Generator for Audio Testing
- Poor man's frequency counter
- Precision audio millivoltmeter
- Precision Frequency Marker
- Precision VXO for Crystal Characterization & Matching
- Pulse Reading Logic Probe
- Pulse Reading Logic Probe
- Quickie servo tester for testing servo motors (based on Atmel AT90S2343)
- RCM710 electronic scale, technical manual including schematic
- Resistor decade box
- Return Loss Bridge
- RF field strength meter
- RF Power Meter for the QRP measures up to 25 watts
- RF probe circuit diagram and Autotrax PCB layout
- Schematics and C code for a 0-5V PIC LCD volt meter
- Schematics and C code for a PIC frequency counter operating up to about 50 MHz (7 segment)
- Schematics and C code for a PIC frequency counter operating up to about 50 MHz (LCD)
- Self Oscillating Amplifier for Distortion Testing
- Self-powered Fast Battery-Tester - Tests 1.5 to 15 Volt cells
- Sensor to display, built with thermistor, 12-bit ADC, 89S52 and LED display
- Service monitor / deviation meter circuit
- Servo Motor Test Circuit (LM555)
- Signal Tracer and Injector
- Simple diagnostic tool for use on repeaters in the field
- Simple electronic S meter
- Simple Frequency Counter
- Simple Ground Loss bridge for Ground Loss Measurement at LF
- Simple Inductance Meter
- Simple light sensor adapter for oscilloscope
- Simple Ph Meter
- Simple polarity detector
- Simple Polarity Tester
- Simple test equipment to build
- Simplified Measurement of Output Impedance for Audio Circuits
- Single chip digital voltmeter using ICL7129
- Soft Power On Tester for Amplifiers
- Sound pressure level meter
- Spectrum analyzer Mk 1
- Spectrum analyzer Mk 2
- Square wave oscillator (555) for test applications
- Stereo Test Tone Generator
- Stereo Test Tone Generator
- SWR Bridge 1 to 1000 Mhz (1GHz)
- TDR cable reflection tester (Time Domain Reflectometer)
- TDS/PPM Meter for measuring of the amount of salts in a solution
- The u-counter, a PIC based programmable frequency meter (PDF)
- Thermistor Thermometer: LCD version
- Time Domain Reflectometer (TDR)
- TinyScope - simple all-valve 1-inch CRT oscilloscope
- Transistor tester and signal injector
- Transistor tester using 555 timer and 4027
- Triple Stroboscope
- True RMS Watt Meter
- TTL pulse counter/logic probe
- TTL Pulse Reading Logic Probe
- TXTVb - 70cm ATV Test Generator (PDF)
- UHF signal generator
- Ultra-simple Voltage Probe
- Ultra-simple voltage probe
- Universal frequency counter & voltage meter
- UTP Cable Tester
- VCR Tuner Based RF Spectrum Analyzer Schematic
- VHF signal generator
- Wire tracer
- Wireless Frequency counter
- XTal Tester for testing quartz crystals based on a pair of BC550C PNP transistors
- Z80 controlled Viscometer project
- Zener diode tester based on a 555 timer
Posted by B.Tech Live projects for ECE,EEE,EIE,ICE at 5:15 AM 0 comments
Radio frequency projects
- 1 Watt 2.3 GHz RF Amplifier Using a MRF2001
- 1.5 W RF Power Amplifier type class-C
- 10 meter (28MHz) band RF amplifier
- 10 MHz WWV Receiver
- 10.7MHz FM detector
- 10W HF linear amplifier
- 136 kHz direct conversion receiver
- 14MHz SSB 10mW Transceiver
- 15M CW Transceiver Design
- 160m mini portable End Fed Half Wave Tuner - MkII
- 175KHz inductive pulse receiver (PDF)
- 18 dB LT1253 DDS Amplifier
- 2.3 GHz Power Amplifiers
- 20 Meter CW Transceiver
- 20 meters CW QRP Transceiver (PDF)
- 20 Watt GaAaFET Power on 2.3 GHz
- 200-400 MHz voltage controlled oscillator (PDF)
- 20dB VHF Amplifier
- 222 MHz Transverter
- 23 dB Bipolar DDS Amplifier
- 2304 and 3456 MHz Power Amplifiers
- 27MHz transmitter
- 2M - 20M transverter
- 2m (144MHz) Dual Gate FET Low Noise Amplifier
- 2N2222 40 Meter CW/DSB Transceiver
- 30 Meter, Discrete Component CW Transceiver Built Manhattan-style
- 30 W Digital Wattmeter for RF (0-500MHz)
- 30 watt FM linear amplifier
- 300 baud RF modem circuit schematic
- 30M Direct Conversion Receiver Project
- 30M PSK31 Transceiver
- 3W HF QRP linear amplifier
- 4 channel 433MHz remote control transmitter / receiver based on SM5162 and SM5172 chips
- 40 Meter Band Direct Conversion experimental receiver
- 40 Meter Popcorn Superhet Receiver
- 40 Segment LED S-Meter
- 40 to 6 Meter "No Tune" Transverter
- 40m band direct conversion receiver
- 42 Mc Band to 88 Mc Band (retrofit converter) Project
- 450-2000KHz AM receiver (ZN414)
- 455 Khz MF to AF converter used for DRM reception in a Yaesu FRG-100 receiver
- 45-860MHz Radio receiver based on UV916-tuner
- 49MHz walkie-talkie
- 5 tubes SSB QRP Transceiver for 20m Ham band
- 5 watt, 80 meter QRP CW Transceiver
- 50 MHz Receiver based on MC3372
- 500mW HF linear amplifier
- 500W HF linear amplifier
- 50MHz converter project based on a NE602/SA602/NE612
- 50MHz RF Power Amplifier using BFG97
- 56K RF Modem
- 6 Meter SSB transceiver
- 60-120MHz FM receiver with AFC
- 60W Linear amplifier using IRF840 power MOSFET
- 60W RF linear amplifier using IRF840
- 6m SSB & CW QRP transceiver
- 73MHz remote controller hallogen light
- 75 Meter QRP SSB Transceiver
- 78-80 MHz Superfast Scanner using a DDS (direct digital sythesizer)
- 7MHz SSB Transceiver
- 80 Meter CW ARDF receiver
- 80 meter direct conversion receiver
- 80m band direct conversion receiver
- 80m SSB & CW QRP superhet transceiver
- A compact L-match ATU for portable use
- A Multimode Phasing Exciter for 1 to 500 MHz from ARRL (PDF)
- Active antenna 1 to 20dB, 1-30 MHz range
- Active Antenna AA-7 HF/VHF/UHF, 3-3000MHz
- Active Antenna Experiments
- Active Antenna for AM-FM-SW
- Advanced VHF power meter (PDF)
- Aircraft Radio Communications Receiver
- AM BCB radio receiver
- AM receiver circuit diagram
- AM receiver for aircraft communications
- AM Short Wave Broadcast Receiver circuit diagram
- AM to FM conveter
- AM/FM/SW active antenna
- AM-Receiver for Aircraft communication (118.250MHz)
- An end-fed antenna, L-match coupler and resistive bridge for HF
- An Inexpensive Tone Encoder
- Assorted RF circuits
- Audible S-Meter
- Aviation band receiver
- Basic 10GHz / 24GHz gunplexer / gunn diode control circuit (PDF)
- Basic RF oscillator
- Basic Vox Circuit
- Bi-Directional 2.4 GHz One Watt Amplifier
- Bi-Directional 900Mhz One Watt Amplifier
- Bipolar transistor RF mixer
- Bootstrapping a Phase Locked Loop for Better Performance
- Broadcast-Band RF Amplifier
- Bug detector / countersurveillance monitor
- Bug detector with beep using 7413 or 74LS13
- Build a COS Detector to detect the presence of a carrier on a receiver
- Build a good GaAs FET preamp for 2 meters, 222MHz or 440MHz
- Car radio tunes the amateur bands
- Cascode 7 Experimental Receiver
- Cascode Hybrid-Based WWV Receiver for 5 MHz
- CB (27MHz citizens band) 2.5W transmitter
- CB (27MHz citizens band) receiver
- Class B series modulator
- Class E Power Amplifier Design (136KHz operating frequency)
- CMOS RF PLL sythesizer
- Compact 20 - A 14 MHz Direct Conversion Receiver
- Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio
- Converter to Hear Amateurs on your FM Radio
- Converter to yune six metres on your two metre receiver
- COR Carrier Delay timer / Hang Timer
- Crystal Radio
- Crystal radio circuits including diode performance comparison
- DC40 - 40M Direct Conversion receiver
- Deluxe Direct Conversion Reciever
- Demodulator Schematic/Design using Gilbert Cell Mixer
- Digitally tuned radio board to create an embedded FM radio controlled by a Mega128
- Direct Crystal radio receiver examples
- Direction finder system
- Dopler RDF (radio direction finder) circuit
- Electroluminescent Receiver Kit includes circuit diagram
- Electronic Eavesdropping Devices Detector
- Electronic Eavesdropping Devices Detector (bug detector)
- Experimental DSB/CW QRP rig for 20 and 40 meter bands (PDF)
- External antenna for the GPS-38, Magellan 2000, or Eagle Explorer GPS receivers
- FM radio active antenna
- Four channel RF remote control
- Four Channel Wireless Transmitter and Receiver using RF modules (PDF)
- Galvanic isolated CAT & audio interface for amateur radio
- Generic VHF power amplifier
- GPS jammer
- Harmonic oscillator
- HF 10 watt amplifier for 18MHz using a 2SC1969/2SC1944 transistor
- HF/6M Antenna Tuner Preselector and Antenna Switcher
- HF/VHF mini portable antenna tuner
- HF/VHF portable antenna tuner
- High quality AM through your FM stereo
- High-Performance Direct-Conversion Receivers from ARRL (PDF)
- High-Performance, Single-Signal Direct-Conversion Receivers for ARRL (PDF)
- Homebrew 20m CW Transceiver
- Homebrew 30m CW Transceiver
- Homebrew 40m CW Transceiver
- Homebrew 6m DSB Transceiver
- Homebrew 6m SSB/CW Transceiver
- How to Build a 300MHz AM, RF Remote Control System
- ICOM CI-V interface with RS232 RTS to PTT
- Improved AM-Receiver for Aircraft communication
- Improved CMOS RF PLL sythesizer
- Improved FM Stereo Modulator
- inexpensive high speed microwave data link using an Alpha Gunnplexer for 10 Mbps data rate
- Junk Box NDB Low Pass Filter
- K8IQY's Original 2N2/40 CW Transceiver Rig
- Kenwood TR-7950 manual & schematics (PDF)
- KL 400 RF linear amplifier
- LF to HF Converter
- Linear FM 50 watt amplifier with BLY90
- Linear FM 50Watt with BLY90
- Low Frequency Circulator/Isolator Uses No Ferrite or Magnet (PDF)
- Low Power RF ID Transponder (PDF)
- MC13136 based narrow band receiver
- Medium Frequency TRF Receiver
- MF and HF Receive Antenna Splitter
- Morse Code Beacon Keyer
- Multiplier Generates Odd Harmonics (PDF)
- MW Enhanced Crystal Receiver using 741 IC
- MW/SW Radio receiver
- Novel crystal set requires no antenna, earth
- One transistor FM receiver
- One transistor regenerative receiver
- One Watt 2.45 GHz Linear Amplifier using RF Micro Devices RF2126
- One watt class-C RF amplifier (PDF)
- Op Amp Radio
- Op-amp based radio receiver
- Op-Amp Radio
- Phase Locking and Tuning
- Phase-Locking ULNs for Optimum Performance
- Phasing SSB exciter
- PLL synthesized FM radio that can decode DTMF
- Pocket sized 20m (30m) CW QRP transceiver
- Popcorn Direct Conversion Main Frame
- PSK Transceiver - Unique transceiver design does not use a SSB transmitter
- Q-multiplier
- QRP - Circuits for measuring RF Voltage, RF Current, RF Power, SWR
- QRP Antenna Tuner
- R2T2 Haywire Home Station
- Radio Wave Alarm
- Receive Loop Preamplifier for LF reception
- Receiver based on NE602
- Receiver building blocks
- Regenerative receiver for the AM broadcast band using two transistors
- Regenerative Short Wave Radio
- Regenerative shortwave receiver
- RF Actuated Keying Monitor
- RF front-end for triple conversion GPS receiver (PDF)
- RF Isolator Uses Differential Amplifiers
- RF noise bridge for HF
- RF Power Amplifier Module using Toshiba S-AV10H
- RF Power meter / dummy load
- RF preamp circuit diagrams
- RF Sniffer under 0.5MHz to above 500MHz
- RTTY terminal unit
- RX3302 receiver module schematic
- SA602, SA612 RF Mixer
- SCA Adapter - listen to advertisement free background music on FM broadcast radio
- SCA Subcarrier Demodulator for FM broadcast stations
- Send Morse on your VHF Rig
- Sensitive LW/MW/SW Shortwave general coverage receiver
- Simple 40 meters CW QRP Transceiver (PDF)
- Simple CW identifier for a FM repeater (PDF)
- Simple Dual Band SSB Transceiver (20/40 meters)
- Simple RIT circuit based on a 2N7000 FET
- Simple wireless radio data link
- Smooth Tone Clickless CW Sidetone Generator
- Some experiments with active or voltage probe antennas (VPA)
- SOP direct conversion receiver
- SOP receiver (PDF)
- SSB linear amplifier made from a bunch of 2N2218 transistors
- SSB Receiver / Exciter and Linear amp
- Stacked Torroid VFO Experiments 2008
- Subcarrier adapter to listen to hidden subcarrier signals on FM radio
- Super 80 ultra-simple SSB receiver for 3.5 MHz a basic superhet
- Super improved AM-Receiver for Aircraft
- Super Scanner 45-860MHz with 0.01Hz stepsize
- Superior TV-tuner receiver 45-860MHz in 2500Hz step
- Superregenerative 27MHz receiver
- SW30+ 30 Meter CW Transceiver
- Switching Diode Frequency Doublers (PDF)
- SWR bridge covering HF to VHF
- Synthesized HF receiver
- TBA120 narrowband FM receiver
- TDA7000 receiver
- The MRX-40 Mini Receiver (PDF)
- TR1001 868.35 MHz Hybrid transceiver schematic
- Two Diode Odd-Order Multiplier
- Two Transistor Reflex Radio
- TX Module Combiners (copied from commercial circuits)
- UHF Preamplifier covers 450MHz - 800MHz based on MPSH10 / BF180 / BCY90
- Universal USB digimode interface supports CAT (Yaesu), CI/V (Icom) and RS-232 (Kenwood) units (PDF)
- USB / CAT (CI-V) adapter tested with FT-8900, FTB-9800, VX-7R, VX-7, FT-817 and IC-706MkIIG
- Variable Bandwidth CW Filter
- Variety of receiver converter projects
- VFO from 2001 ARRL Handbook, page 14.20
- VFO from 2001 ARRL Handbook, page 17.74
- VHF 6 Meterband RF amplifier
- VHF receiver converterer
- VLF radio receiver schematic
- VLF Upconverter for Shortwave Receiver
- Wave Bubble - A design for a self-tuning portable RF jammer
- Wave Bubble self-tuning portable RF jammer
- Wee Willy 75 Meter DSB Transceiver Project
- Wideband SWR meter
- Wideband VHF/UHF/SHF 22dB RF preamp with MAR-6 or MAR-8 (MSA-0885)
- WLW 500KW Transmitter Schematic
- Yaesu band decoder schematic
- Yaesu FT-736R doppler compensation
- ZN414 receivers
Posted by B.Tech Live projects for ECE,EEE,EIE,ICE at 5:14 AM 0 comments
Solar Power schematics & projects
- 12 Volt 20 Amp Solar Charge Controller
- 1381 solar engine
- AA Battery Solar Charger
- AA battery solar charger
- Buck Mode Switching Regulator for Solar Applications
- Build a DIY solar iPod charger
- Converter that enables long cable wiring for pyranometer
- LED7 solar tracker
- Measure solar radiation on an Ubuntu Server
- Photovoltaic Solar Battery Regulator and Load Controller
- Portable solar battery charger
- Remote Solar LED light
- SCC2 10 Amp Solar Charge Controller
- SCC2 10 Amp Solar Charge Controller
- Self Powered Solar Box Furnace
- Sensor Electronic Tracker with H-Bridge Drive
- Sensor Electronic Tracker with Simple Solar Charge Controller
- Shunt-mode Solar/Wind Charge Controller
- Solar cell battery charger circuit diagram
- Solar cell Nicad charger using Maxim MAX639
- Solar charge controller
- Solar Charged LED Flashlight
- Solar energy meter
- Solar Panel Charge Controller / Low Voltage Disconnect Circuit
- Solar Panel Charge Controller / Low Voltage Disconnect Circuit
- Solar Panel Charge Controller / Low Voltage Disconnect Circuit (SPC1)
- Solar Panel Current Meter
- Solar Panel Current Meter
- Solar Powered Night Light
- Solar Powered Reading Lamp
- Solar robots
- Solar switching regulator as published in Silicon Chip Magazine January 1994 Part 1/2 (PDF)
- Solar switching regulator as published in Silicon Chip Magazine January 1994 Part 2/2 (PDF)
- Solar Tracker
- Solar tracker
- Solar tracking control system
- SPC2 6 Amp Solar Power Center
- SPC2 6 Amp Solar Power Center
- SPC3 9 Amp in / 10 Amp out Solar Power Center
- Zener-based solar engine
Posted by B.Tech Live projects for ECE,EEE,EIE,ICE at 5:14 AM 0 comments
Photography & Camera related collection
- A home-made light-operated camera trigger using the stamp microprocessor
- A simple home-made light-operated camera trigger
- AI-1 ("All-in-one") Remote - photographic accessory that you can build
- Camera remote control system using Basic Stamp
- CamTrig - A home-made light-operated camera trigger
- Canon DSLR cable shutter release usin 4N25 for optical isolation
- Computer controlled EOS camera shutter trigger
- Computer Sound Port Shutter Tester
- Computerized Shutter Control of Canon DSLRs
- Control your camera (Canon DSLR) with your Palm PDA
- Darkroom camera shutter timer
- Densitometer & Intervalometer projects
- Densitometer & Intervalometer projects including hand-drawn block diagrams only
- Digital cameras (AGFA, Olympus) to PC (COM) cable pinout
- DIY Intervalometer for a Canon SLR camera
- Dual cable (serial + USB) for Nikon Coolpix cameras
- Electronic shutter release with ultrasonic remote control
- Flash Slave Trigger
- Flash slave trigger
- Flash Slave Trigger for Digital Camera
- High speed flash photography for amateur photographers
- High-speed flash photography for amateur photographers (includes several circuit diagrams)
- Homebrew Wired Remote for Canon EOS 350D Camera
- How to Build Your Own Light Meter (PDF)
- Infrared remote control with intervalometer function for Nikon cameras
- IR Remote Control for Nikon cameras, standard version
- Kodak DC-20 camera interface (PIC12C509)
- Kodak DC-20 camera interface (PIC16F84)
- kShutter: Simple remote shutter for Nikon Coolpix camera
- kShutter2: Advanced remote shutter for Nikon Coolpix cameras
- Large collection of strobe / photoflash circuit diagrams
- Lightning Activated Camera Shutter Trigger
- Lightning activated camera shutter trigger
- Lightning Activated Camera Shutter Trigger
- Making your own RS-60E3 Remote Control for Canon EOS cameras
- Nikon Coolpix 950 / 990 / 995 Flash-adapter
- Nikon IR-Remote Control based on Atmel ATtiny13
- Nikon programmable memote / intervalometer
- Programmable Hi Speed Flash & Camera Trigger
- Programmable Optical Slave Flash Trigger for Digital Cameras using PIC12F675
- Remote shutter (or 'cable release') for SLR and DSLR cameras
- Sea & Sea TTL (Motormarine II, SX-1000) Flash Interface (underwater photography flash)
- Serial cable for Casio QV-200 digital camera
- Simple sound syncronizer / sound activated shutter trigger for amateur photography
- Slave flash trigger
- Slave Flash Trigger Circuit
- Slave flash trigger with counting logic (Silicon Chip Mazine article)
- Stop Action 3D-Photography using an audio flash trigger
- Timelapse photography with the Canon 10D using a 555 timer based circuit
- Universal Exposure Timer and Event Counter
- Universal sound and optical slave flash trigger
Posted by B.Tech Live projects for ECE,EEE,EIE,ICE at 5:13 AM 0 comments
Powersupply circuits for everyone & Most applications
- +9V *and* -9V from one battery
- 0-14 volt, 0-2 amp current limited variable power supply regulator
- 12 Vdc - 120 Vac Inverter Schematic
- 12 volt battery monitor
- 12 Volt Gel Cell Charger
- 12 volt power supply
- 12 Volt Switching Power Supply circuit diagram and PCB layout
- 12V 30A power supply
- 12V Lead-Acid Battery Monitor using LM3914
- 12V to 120V Inverter
- 12V, 4-AA Cell Differential Temperature Charger
- 13.8V 30-40A Power Supply (PDF)
- 1A Variable Regulated Power Supply
- 200 Watt Modified PC Power Supply 13.5 Volt 14 Amp
- 3rd harmonic distortion meter for measuring the quality of AC supply
- 5 volt power supply
- 500W low cost 12V to 220V inverter
- 6V to 12V Converter
- 6V to 12V Converter
- AC Power Meter
- Active Power Zener
- Adjustable power supply using LM317
- Adjustable Voltage Regulator using a 7805 or other fixed linear voltage regulator instead on LM317
- Advanced High Voltage PSU circuit
- Alkaline battery charger
- Alternative power source for Magellan GPS receivers
- Amplified zener regulator
- Assorted power source and control circuits
- Automatic 12V Lead Acid Battery Charger
- Automatic 9V NiCad battery charger
- Back And Forth - Bidirectional Bipolar Stepper Motor Driver
- Basic 78xx series regulator mains power supply circuit diagram
- Basic Power Supply
- Basic Solid State Relays
- Basic UPS Power Supply
- Battery Characterizer
- Battery charge for 12V SLA batteries
- Battery Charger Ideas
- Battery Charger, Current and Voltage Regulated for Sealed Lead Acid batteries
- Battery Low Voltage Beeper
- Battery Low Voltage Beeper
- Battery voltage monitor
- Bench power supply
- Bench power supply that allows a number of varying output voltages to be preset. Includes PCB layout
- Breadboard supply - very low dropout adjustable power supply
- Build A 10 Amp 13.8 Volt Power Supply
- Build a breadboard power module for integrated circuits
- Build A High Performance Voltage Regulator From Discrete Components
- Build A Simple Rechargeable CMOS Battery
- Car Ignition Coil Driver from 110V AC
- Car Ignition Coil Driver from 12V DC - Can be used as an electric fence
- Charge Monitor for 12V lead acid battery
- Charger for gel lead acid batteries
- Cockcroft-Walton voltage multipliers (PDF)
- Compressor-mate power protection for refrigerators, freezers and air conditioners
- Controller for hybrid (photovoltaic- wind turbine and diesel engine) power plant
- Current booster for 78nn series voltage regulators
- DC to AC inverter using a 555 timer
- DC Voltage and Current Source
- Dual (postive and negative) 12V power supply
- Dual Polarity Power Supply
- Dual Polarity Power Supply
- Dual power supply
- Dual regulated power supply
- Dynamo Current and Voltage Regulator
- Easy power supply
- Efficient unipolar stepper motor driver (only uses power when it makes a step)
- Expanded Scale Battery Volt Meter
- Expanded Scale Battery Volt Meter
- Fast NiMH / NiCd Battery charger
- Filtering PC bus POWER
- Fixed Voltage Power Supply
- Fixed Voltage Power Supply
- Flyback transformer driver
- Fuse blown indicator
- Fuse monitor / alarm
- General purpose portable DC power supply using rechargeable C cells
- Generating -5VDC from +5VDC
- Gyrator circuit
- High Current Power Supply
- High Current Power Supply
- High current regulated power supply
- High Side Current Monitors (LM358, Zetex - ZXCT-1009)
- High voltage DC generator
- High Voltage High Current Power Supply
- High Voltage High Current Power Supply
- High-Voltage Pulse Generator
- HV supply: 12VDC in, 12KV out
- Inverter, 12 volt unit, MOSFET design
- Inverter, A 12 volt unit, Very Basic type
- Lead acid battery charger with float
- Lead/acid battery charger
- Lead-Acid Battery Monitor
- LED battery voltage monitor. A fuel gage for your gel cell battery.
- Lithium Battery Rejuvinator
- LM311 Thermostat circuit diagrams
- LM317 Regulator Circuit
- LM3914 battery monitor
- Low Battery Voltage Cutout Circuits
- Low Power LED Voltmeter
- Low Power LED Voltmeter
- Low Voltage Alarm for batteries and other volatile DC power sources
- Low-dropout 12V regulator (LM324)
- Machine power loss beepter (PDF)
- Multiple voltage power supply
- N.O. Magnetic Reed Switch ON /OFF Circuit (SCR equivalent)
- Nagative voltage generation using 555 timer
- Negative Supply from single positive Supply using 555 timer
- Negative voltage generator
- Nicad battery charger
- Nicad battery charger
- NiCad Discharger for Tx & Rx Packs
- NiCd Cell Charger
- Nine Volt Battery Eliminator
- One 9V battery gives +18, +25, +33V
- Power reminder beeper (PDF)
- Power supply metering circuits for measuring both voltage and current
- Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
- Preselect Twin Coil Switch Machine Circuit
- Pulse Charger for reviving tired Lead Acid batteries
- PWM DC Motor Speed Control
- PWM Motor Speed Controller / DC Light Dimmer
- PWM Motor/Light Controller
- PWM Motor/Light Controller
- PWM Motor/Light Controller variants
- Regulated 12V supply
- Regulated Power Supply Circuits
- Simple +5V power supply circuit
- Simple Capacitance Multiplier Power Supply For Class-A Amplifiers
- Simple constant current source
- Simple DC Adapter Power Supply
- Simple NiCad battery charger using LM317
- Simple power supply
- Simple switching power supply
- Simple switching power supply (mains operated)
- Simple switching regulator (experimental)
- Simple voltage booster based on Linear Technologies LT1372, includes PCB design
- Single to 3-phase power conversion
- Small battery-powered USB charger including circuit diagram and PCB layout
- Snowmobile GPS power adapter
- Solid state relay circuit
- Solid State Tesla Coil/High Voltage Generator
- Team digital - SCR16 - Twin Coil Switch Machine Adapter
- Temperature Controlled Nicad Charger
- Temperature Controlled NICD Charger
- Tesla coil / HV generator
- Transformer Secondary Voltage Reduction
- Transformerless Power Supply
- Transformerless Power Supply
- TTL power supply with crowbar protection
- Turn an ordinary wall wart / plug-pack into a regulated device
- Unplugged power cord alarm
- Unregulated power supply
- USB charger
- Using Pass Transistors Beef Up Voltage Regulator current output
- Valve power supply
- Variable Dual Lab Power Supply
- Variable power supply
- Voltage and current regulated power supply
- Voltage converter
- Voltage doubler
- Voltage Inverter
- Voltage Inverter
- Voltage inverter
- Voltage Inverter using 555 Timer
- Voltage Inverter using LM380 audio amplifier IC
- Voltage Monitor using UA741 operational amplifier
- Voltage monitor with LED indicator
Posted by B.Tech Live projects for ECE,EEE,EIE,ICE at 5:13 AM 0 comments
Combining PC with electronics. SCADA
- 160 Baud ALDL Hardware Interface
- 300/1200 baud BAYCOM MODEM (revision and improved)
- 3-axis stepper motor controller for PC parallel port
- 7 segment rolling display using PC
- 8-way relay interface board for PC parallel printer port
- 9-pin null modem cable
- A Serial Infrared Remote Controller
- Analog Signal Acquisition for PC Printer Port
- Apple II/II+/IIe IDE Drive Interface
- Assorted computer interface circuits
- Basic Stamp I & PC Relay Controller
- Bell 202 and CCITT V23 Compatible FSK Modem Circuit
- Build your own iRDA SIR Transceiver (Dongle) using MCP2120
- Building an Infrared Transmitter for Your PC
- CCD linear image sensor to PC parallel interface
- Circuit for interfacing a relay / solenoid to a PC based on a 2N7000 FET
- Circuits to computerize your room/house
- Commodore 64 24-bit parallel port interface with 8255
- Computer Controlled Frequency Counter/Logic Probe
- Computer microphone
- Connect other circuits to PC joystick port
- Connect two CD-ROM drives to one soundcard
- Convert Atari-style joystick to PC joystick port
- Dallas DS1620 based USB Digital Thermometer
- DB-9 Connector to DB-25 (both RS-232)
- DCF77 receiver to PC RS232 serial port interface
- Ericsson phone to PC serial port interface
- Ethernet interface for Commodore 64 computer
- Extremely simple ADC for the PC (parallel port interface)
- Fake Joystick circuit
- Fax to modem interface
- FM radio for a PIC (uses TDA7000 IC which is now obsolete)
- FM radio with PC parallel port interface
- Game boy camera PC serial interface
- General purpose ISA interface card for PC
- Get power out of PC parallel port
- Get power out of PC RS-232 port
- Getting power from RS-232 interface
- GPS receiver (Gamin, Eagle etc) to PC interface cables
- HAMCOM & SoundCard MODEM using serial- or soundcard audio
- HAMCOM (SSTV, RTTY, FAX...) modem using PC-speaker for TX
- HAMCOM (SSTV, RTTY, FAX...) modem using serial audio for TX
- Headphone driving circuit for soundcards
- Hi-Fi PC Speaker System
- Homebuilt RS232 LCD Interface
- Homemade Serial to Nokia MBus Interface on a PCB, without using Zener diodes
- How to construct Garmin GPS receiver interface cables
- How to get power from PC to your circuits
- I2C printer port adaptor
- i2c-tiny-usb, a simple i2c interface for the usb port
- iLINK Interface
- Interfacing 16x2 character :LCD to parallel port
- Interfacing PC sound card to SSB rig
- iRDA interface for motherboard using Vishay TFDS4500
- Isolated Full Duplex RS232C Interface
- Jasmin floppy disk controller schematics
- Laptop Computer Serial Port Power Booster
- LCD2LPT with LIRC (LCD to LPT printer port) interface
- LCD2USB, cheap open source text LCD interface
- Linux Infra-red Remote Control (LIRC)
- Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
- Mac to HP48 cable pinout
- Machine Independent Parallel Interface
- MIDI cable for Sound Blaster cards
- More accurate PC/AT clock
- MS-DOS EEPROM Programmer
- New and Improved Sound Card Packet Interface tested with PSK31 and APRS
- Null Printer Adapter
- Parallel (Printer) Port Interface
- PC based digital thermometer based around a Dallas Semiconductor DS1621
- PC based Frequency Meter
- PC based thermometer based on Dallas DS1621
- PC electrically isolated RS422 interface using SN75176B or MAX485
- PC electrically isolated RS485 interface using MAX487 or SN75176B
- PC interface for point controller
- PC ISA board containing a Z80 microprocessor (coprocessor card)
- PC ISA Card Random Number Generator
- PC parallel port eight DC power switch cam driver two unipolar stepper motors, lights etc
- PC speaker volume control circuit
- PC thermometer using PC game (joystick) port
- PC-based ISA data acquisition and control board
- PG31 GPS RS232 GPS development board
- PG31 GPS RS232 USB development board
- Pic-Plot GPIB to RS-232 converter
- Pic-Plot2 GPIB to USB converter
- PTT and soundcard interface for the TM255/455
- PTT and/or soundcard interface
- Radio clock for PC's
- Relay interface add-on board for PC
- RFID evaluation kit for PC serial port (PDF)
- RS232 - Lowe HF-225 interface
- RS232 DB-9 switch to flip between two serial ports
- RS-232 line monitor and loopback cables
- RS-232 Protocol Analyser
- RS232 RS485 USB Converter Board
- RS232 serial to USB converter cable circuit schematic
- RS-232 surge protection
- RS-232 to TTL cable
- RS232C Level Converter
- Sanyo 20EZ monitor circuit diagram
- SB-Bus Drivers Introduction and Circuit Diagrams
- Schematic of a standard PC joystick
- Sega 3D glasses interface circuit diagrams
- Serial port temperature datalogger
- Serial servo controller for interfacing hobby servos via RS232 to a PC
- Serial to parallel converter - connect a large number of digital outputs to a PC parallel port
- Short circuit protected power supply from PC 12V supply
- Simple Hankel USB oscilloscope for a PC
- Simple music synthesizer for an ATARI
- Simple Parallel (Printer) Port Interface
- Simple PC SmartCard reader
- Simple PC thermometer for serial port but using R/C network for measurement
- Simple RS-232 serial port buffer circuit
- Simple stepper motor driver for PC parallel port
- Small circuit and PCB layout for recording to PC Sound Monitor / Pre-amp
- SmartCard PC Emulator
- Sound Blaster Microphone Preamplifier
- Stepper motor controller for PC parallel port
- SWTP PR-40 Printer Interface Schematics
- The Great Z80 Computer Project
- The KD2BD Pacsat Modem
- Thermal fan control circuit designed for overclocked PCs
- TiltStick, a motion sensing device (USB interface to accelerometer)
- TM-441 9600bps packet modification
- Transceiver to PC interface with a hardware DTMF detector and galvanic isolation (PDF)
- Transceiver to PC soundblaster interface for digital operating modes (PSK-31, RTTY, SSTV etc)
- USB camera circuit
- USB LCD/VFD Controller Hardware
- USB to parallel port converter using Cypress CY7C68013A-56PVXC
- Using a PC power supply as a benchtop power supply
- Using the joystick port as general purpose input
- Various sound card interfacing circuit diagrams
- Yaesu FT-897 - PC interface (PDF)
- Yaesu VX-7 / VX-7R to PC interface
- Z80 Computer
Posted by B.Tech Live projects for ECE,EEE,EIE,ICE at 5:12 AM 0 comments
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