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Audio
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PC related
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RF circuit
Robotics
Security
Telephone
Test
Video and TV
Miscellaneous

  
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Audio
  1. 1.5W Audio power amplifier (12V)
  2. 10 Band Audio Equalizer
  3. 100W Audio Amplifier
  4. 100W Guitar Amplifier
  5. 100W RMS Amplifier
  6. 10W Audio Amplifier with Bass-boost
  7. 10W Audio Power Amplifier
  8. 10W Mini Audio Amplifier
  9. 16w Bridge Amplifier
  10. 18W Audio Amplifier
  11. 1W Bass Power Amplifier
  12. 200W audio amplifier
  13. 20W Power Amplifier
  14. 22 Watt Audio Amplifier
  15. 22W Stereo Amplifier
  16. 250 mW Audio Amplifier
  17. 25W Mosfet audio amplifier
  18. 3 Channel Spectrum Analyzer
  19. 3 Line Mixer
  20. 3 Transistor Audio Amp (50 milliwatt)
  21. 5 band graphic equalizer using a single IC/chip
  22. 5 Watt Class-A Audio Amplifier
  23. 50 Watt Amplifier
  24. 60W Bass Amplifier
  25. 60W Guitar Amplifier
  26. Amplified Ear
  27. Amplifier 2x30W with STK465
  28. Amplifier of acoustic frequencies with preamplifier
  29. Audio Distribution Amplifier
  30. Audio Visual Indicator for Telephones
  31. Automatic Loudness Control
  32. Bass-treble tone control circuit
  33. Bass-treble tone control circuit
  34. Baxendall Tone Control
  35. Classic Audio Mixer
  36. Digital Volume Control
  37. Digital Volume Control
  38. Digital Volume Control
  39. Electret Microphone Pre-Amplifier
  40. Electronics Attenuator
  41. FET Audio Mixer
  42. Guitar Amplifier
  43. Headphone Amplifier
  44. Improved 3 Transistor Audio Amp (80 milliwatt)
  45. Infrared Head Phones
  46. Low cost intercom using transistors
  47. Low impedance microphone amplifier
  48. Mini-box 2W Amplifier
  49. Musical Instrument (Expandable) Graphic Equaliser
  50. Phono Preamplifier
  51. Portable Headphone Amplifier
  52. Portable Microphone Preamplifier
  53. Portable Mixer
  54. Precision Audio Millivoltmeter
  55. Simple Intercom
  56. Sound Controlled Filp Flop
  57. Sound Level Meter
  58. Sound Pressure Level Meter
  59. Speaker Microphone
  60. Speech Recorder
  61. Stereo Channel Selector
  62. Stereo Preamplifier with Bass-boost
  63. Stereo Tone Control
  64. Stereo Tube Amplifier
  65. Surround Sound Decoder
  66. Three-Level Audio Power Indicator
  67. Two transistor audio amplifier circuit
  68. Two way cross-over 3500 Hz
  69. Ultrasonic pest repellent
  70. Ultrasonic Switch
Automotive
  1. Automatic Headlight Brightness Switch
  2. Capacitor Discharge Ignition Circuit (CDI)
  3. Car Battery Charger
  4. Charge Monitor for 12V lead acid battery
  5. Dome light dimmer for Cars
  6. Headlight Flasher
  7. Headlights Timer
  8. Intermittent wiper controller
  9. Lighting Third Brake Light
  10. Nite Rider Lights
  11. Park-Aid
  12. Pulsing Third Brake Light
  13. Simple but reliable car battery tester
  14. Speed-limit Alert
  15. Synchronized multi-spark module (SMSM) for Electronic Ignition Devices (EID)
  16. Ultrasonic Parking Sonar
  17. Wiper Speed Control
Games and entertainment
  1. 3V LED Chaser
  2. 6V Ultra-Bright LED Chaser
  3. Electronic Scoring Game
  4. Game Show Indicator Lights (Who's First)
  5. JAM(Just A Minute) Circuit
  6. Pinewood Derby Finish Line Lamps
  7. The flashing Heart
  8. The Millipede
  9. TV remote control Blocker
Microcontrollers
  1. "SimpleMouse" Smartcardprogrammer
  2. ATMEL 89 Series Flash Microcontroller
  3. EPROM adapter for ATMEL 89 Series Flash Microcontroller Programmer Ver 2.0
  4. Funcard Programmer by Diesel
  5. Gold wafer cards
  6. Phoenix Programmer
  7. PIC diode tester
  8. Ponyprog Circuit for ATMEL'S AVR
  9. Producing your own Decrypt Viewing Card Mk2
  10. Programmers for Jupiter Card
  11. Servo Motor Control with PIC16F84
  12. Telephone operated remote control using PIC16F84A microcontroller
Miscellaneous
  1. 7 Segment LED Counter
  2. Cellular Phone calling Detector
  3. Cuckoo sound Generator
  4. Digital Step-Km Counter
  5. Economical Pump Controller
  6. Economy radar detector
  7. Flyback Transformer Driver
  8. Intercommunication (Intercom)
  9. Keys Finder
  10. Nocturnal Animals Whisker
  11. One-IC two-tones Siren
  12. Pot plant water tester
  13. Programmable Digital Code Lock
  14. S-video to RCA
  15. Simple Lie Detector
  16. SmartCard PC Emulator
  17. Time Delay Relay
  18. Time Delay Relay II
  19. Ultrasonic Pest Repeller
  20. Whistle Responder
Models and model remote control
  1. Clap Activated Remote
  2. Deluxe Charge Rate Limiter for Small Capacity NiCad Batteries
  3. Discharger for Receiver Battery Packs
  4. Downed Model Locator
  5. Downed Model Locator II
  6. Infra Red Switch
  7. Infrared Remote Control
  8. Multi Rocket Launcher
  9. Precision Receiver Battery Low Voltage Alarm
  10. Radio Remote Control using DTMF
  11. Receiver Battery Low Voltage Alarm
  12. Remote control using telephone
  13. Remote control using VHF modules
Motor, light and power control
  1. 1.5 Hour Lamp Fader (Sunset Lamp)
  2. 12 Stage Neon Sequencer (NE-2 / NE-51)
  3. 12 Volt Lamp Dimmer
  4. 120VAC Lamp Chaser
  5. 12VDC Fluorescent Lamp Driver
  6. 16 Stage Bi-Directional LED Sequencer
  7. 18 Stage LED Sequencer
  8. 220 Volts Flashing Lamps
  9. 25 Light Sequencer using Xmas lamps
  10. 6 Channel Auto Reverse Sequential
  11. 60 Light Sequencer using a Matrix
  12. 73 MHz Hallogene Lamp Radio-Controlled
  13. Adjustable Strobe Light
  14. Alternating Flasher
  15. Audio Light Modulator
  16. Auto Heat Limiter for Soldering Iron
  17. Automatic 12 Volt Lamp Fader
  18. Automatic Dual output Display
  19. Automatic Room Lights
  20. Automatic Speed Controller for fans & Coolers
  21. Battery-powered Night Lamp
  22. Bicycle back Safety Light
  23. Black Light
  24. Brightness Control for small Lamps
  25. Brightness of multiple displays control circuit
  26. Christmas Star
  27. Courtesy Light
  28. Dancing LEDs
  29. Dark-activated LED or Lamp Flasher
  30. DC Motor Control Circuit
  31. DC Motor Reversing Circuit
  32. Digital Stopwatch 0-60sec
  33. Discrete component motor direction controller
  34. Discrete component motor direction controller
  35. Dome Lamp Dimmer
  36. Emergency Light
  37. Expandable 16 Stage LED Sequencer
  38. Fading LEDs
  39. Fancontrol
  40. Flashing Neons (NE-2 / NE-51)
  41. Flashy Christmas Lights
  42. High And Low Voltage Cut Off With Time Delay
  43. Infa-Red Remote Control
  44. Interfacing 5 volt CMOS to 12 volt/ 25 Watt Loads
  45. IR Remote Control Jammer
  46. Knightrider lights for model cars
  47. LASER Transmitter/Receiver
  48. LED Chaser
  49. LED or Lamp Flasher
  50. LED or Lamp Pulser
  51. LED Photo Sensor
  52. LEDs or Lamps Sequencer
  53. Light Activated Relay
  54. Light Flasher
  55. Optical toggle switch using a single Chip
  56. Pulse Width Modulation DC Motor Control
  57. PWM Motor/Light Controller
  58. Running Message Display
  59. Simple DC motor PWN speed control
  60. Solid State Power Controller
  61. Stepper Motor Controller
  62. Sunrise Lamp
  63. Super simple stepper motor controller
  64. Temperature-controlled Fan
  65. Touch Activated Light
  66. TRIAC Light Dimmer
  67. Triple Stroboscope
  68. Two-wire Lamp Flasher
  69. Unipolar Stepper Motor Controller
Oscillators and timers
  1. 1KHz Sinewave Generator
  2. 28 LED Clock Timer
  3. 28 LED Clock Timer
  4. 50 Hertz LED Clock Timebase
  5. 72 LED Clock
  6. 9 Second Digital Readout Countdown Timer
  7. 9 Second LED Timer and Relay Circuit
  8. Amplifier Timer
  9. Bedside Lamp Timer
  10. Headlights Timer
  11. Jogging Timer
  12. Low Frequency Sinewave Generators
  13. Low Voltage, High Current Time Delay Circuit
  14. Low-distortion Audio-range Oscillator
  15. Mini Metronome
  16. Photo Timer Circuit
  17. Precision Metronome and Pitch generator
  18. Pulse-Generator & Signal-Tracer
  19. Reverse Bias Oscillator
  20. Sawtooth wave generator
  21. Self-powered Sine to Square wave Converter
  22. Simple IF Signal Generator
  23. Simple variable frequency oscillator
  24. Tan Timer
  25. Timed Beeper
  26. Triangle and Squarewave Generator
PC related
  1. 3-Axis Stepper Controller
  2. 4 - Channel Digital Logic Analyzer and 5 Channel Digital Oscilloscope by using PC Parallel Port
  3. 7 segment rolling display using PC
  4. 8 Channel software controlled fanbus with PWM
  5. A Laboratory Control System for Cold Atom Experiments
  6. A Worked Stepping Motor Example
  7. An Improved Infrared Receiver with Status LED
  8. Build your own printer cable LCD Display
  9. Casio data logger
  10. Control electrical appliances using PC
  11. DS1620 based USB Digital Thermometer
  12. DS1621 pc thermometer
  13. Improved Infrared Receiver with status led
  14. IrDA interface for your mainboard
  15. LCD Module Control with PC
  16. LCD2LPT with LIRC
  17. Monitor Your PC's CPU Core Temperature
  18. Opto-Isolated Stepper Motor Controller
  19. Parallel Port Relay Interface
  20. PC based Frequency Meter
  21. PC Serial Receiver (57.6K Baud / TTL & CMOS)
  22. PC Thermometer V2
  23. Reading Data From The Parallel Port
  24. RJ45 Network card to IR communication
  25. RS-232 Laser Transceiver
  26. Simple Analog to Digital Converter
  27. Simple PC thermometer
  28. Stepper motor controller
  29. The 8Way Relay Board
  30. The Relay Sub Board
  31. The Simplified I/O Interface
  32. Use the CD-ROM drive as a audio CD player without the computer
  33. VGA to TV Scart
Power
  1. 0-30 vdc stabilized power supply with current control 0.002-3 a
  2. 0-50V 2A Bench power supply
  3. 10 Amp 13.8 Volt Power Supply
  4. 12 Volt 30 Amp PSU
  5. 120 VAC Lamp Dimmer
  6. 12V Inverter
  7. 13.8V 20A power supply
  8. 2 Watt Switching Power Supply
  9. 2W Switching Power Supply
  10. 3-30 V/2.5 A Stabilized power supply
  11. 500W low cost 12V to 220V inverter
  12. 5V/1A Power Supply
  13. 6V to 12V Converter
  14. A simple step-up converter (6V to 12V)
  15. AC Current Monitor
  16. Basic UPS Power Supply
  17. Batteries charger & PSU - ideal for digital cameras
  18. Constant Current Battery Charger
  19. DC to DC Converter
  20. Dual Polarity Power Supply
  21. Dual Regulated Power Supply
  22. Fixed Voltage Power Supply
  23. Fuse Monitor / Alarm
  24. High and Low Voltage Cutout with delay and Music
  25. High Current Power Supply
  26. High Voltage, Low Current Supply
  27. Instrument panel lamp dimmer control
  28. Inverter
  29. LASER Power Supply
  30. LM317 VARIABLE POWER SUPPLY
  31. Negative Supply from single positive Supply
  32. Ni -Cd Batteries Charger
  33. Ni-Cd Battery Auto Charger
  34. Nicad Battery Charger
  35. NiCd - NiMH Charger
  36. Over / Under Voltage Cut-Out
  37. Portable CD Player Adapter For Car
  38. Power-Off Time Delay Relay
  39. Power-On Time Delay Relay
  40. Pulse Charger for reviving tired Lead Acid batteries
  41. Regulated 12 Volt Supply
  42. Self switching Power Supply
  43. Self-powered Fast Battery-Tester
  44. Simple Car Battery Charger
  45. Solar charger for lead-acid batteries
  46. Solid State Tesla Coil/High Voltage Generator
  47. Transformerless Power Supply
  48. TTL Power Supply with ‘Crowbar’ protection
  49. Ultra low drop linear voltage regulator
  50. Variable 3 - 24 Volt / 3 Amp Power Supply
  51. Variable DC Power Supply
  52. Variable Voltage and Current Power Supply
  53. Varying brightness AC lamp
  54. Voltage Inverter
  55. Voltage Inverter II
  56. Whistle On - Whistle Off
RF circuit
  1. 1 Watt C-Class RF Amplifier
  2. 15W Fm-transmitter
  3. 2 Transistor FM Voice Transmitter
  4. 20dB VHF Amplifier
  5. 3W FM Transmitter
  6. 4 Band Double Tuned Preselector
  7. 4 Transistor Transmitter
  8. 4 Watt FM Transmitter
  9. 40 meter Direct Conversion Receiver
  10. 4W FM Transmitter
  11. 6 x 6 Loop Antenna
  12. 60W Linear amplifier
  13. A small FM transmitter (SMD)
  14. Active Antenna for Medium Wave
  15. AM FM Simultaneous Transmitter Using Digital IC
  16. AM Receiver
  17. AM To FM converter
  18. AM Transmitter
  19. Band 2 Preamplifier
  20. Bipolar Regenerative receiver
  21. CB receiver
  22. CB transmitter
  23. Coil-less FM Transmitter
  24. Coilless FM transmitter
  25. Economy short-wave receiver
  26. Electronic Eavesdropping Devices Detector
  27. Field Strength Meter
  28. FM Beacon Broadcast Transmitter (88-108 MHz)
  29. FM radio
  30. FM transmitter
  31. FM Transmitter Bug
  32. FM Transmitter with Opamp
  33. FM voice transmitter for Band 2 VHF
  34. Linear FM 30Watt
  35. Linear FM 50Watt with BLY90
  36. Long range FM transmitter
  37. Low Distortion Crystal Oscillator
  38. Low-Frequency Crystal Controlled Oscillator
  39. Medium range transmitter
  40. Micro Power AM Broadcast Transmitter
  41. MK414 SW Receiver
  42. MK484 Portable Receiver
  43. MPF102 FM Receiver
  44. One Transistor FM Radio
  45. Powerful AM transmitter
  46. Sensitive Field Strength Meter
  47. Simple FM Transmitter
  48. Simple Op-Amp Radio
  49. Small Radio Transmitter
  50. Surveillance Transmitter Detector
  51. SW RF Pre-Amplifier
  52. Transmitter FM 45W with valve
  53. TV Signal Amplifier
  54. VHF Audio Video Transmitter
  55. VHF Video Transmitter
  56. Video Signal Amplifier
  57. Video to RF Modulator
  58. ZN414 Portable AM Receiver
Robotics
  1. 12-way Input/Output Interface
  2. 5-motor walker circuit
  3. 90S2313 AVR Robot Board
  4. IR Detector for Robotics
  5. Line Robot
  6. RF Modem Robotics Project
  7. Walker Robot
Security and other sensors and detectors
  1. 4 channel Telemetry System
  2. 4 in 1 Burglar Alarm
  3. A simple electronic buzzer
  4. Beeper
  5. Big Ben Sound
  6. Brakelight Flasher
  7. Capacitive Sensor
  8. Car anti theft wireless alarm
  9. Color Sensor
  10. Combination Lock
  11. DayLight Alarm
  12. Dew sensor
  13. Digital Remote Thermometer
  14. Door Alarm
  15. Electronic detector of air flow
  16. Electronic Lock
  17. Electronics Telephone Talking Circuit
  18. Emergency Light & Alarm
  19. Factory Siren
  20. Field-strength meter
  21. Fire Alarm
  22. Fridge door Alarm
  23. Frost Alarm
  24. Heating System Thermostat
  25. Infra-red Level Detector
  26. Infrared Alarm
  27. Infrared beam barrier/ proximity sensor
  28. Infrared emitter and infrared Reciever
  29. IR Remote Control Extender Circuit
  30. IR transceiver 1.0
  31. Light Barrier Detector
  32. Light switch
  33. Light/Dark Detector
  34. Live-line Detector
  35. Low Voltage Alarm
  36. Magnetic proximity sensors
  37. Mains Remote-Alert
  38. Melody generator for greeting cards
  39. Metal Detector
  40. Metal Detector
  41. Police Siren
  42. Power supply failure alarm
  43. Proximity Alarm
  44. Rain Alarm
  45. Remote Doorbell Warning Switch
  46. Room Noise Detector
  47. Sound Operated Switch
  48. Temperature Sensor with Digital Output
  49. Theft preventer alarm
  50. Touch Switch II
  51. Tough switch
  52. Ultra-simple Voltage Probe
  53. UltraSonic Radar
  54. Ultrasonic switch
  55. Voice activated switch
  56. Water Level Indicator with alarm
Telephone related
  1. Audio Visual Ringer
  2. Conversation Recorder
  3. Cordless phone backup
  4. Cut Phone Line Detector
  5. Detector of cellular phone incoming call
  6. FM Telephone Bug
  7. Having secrecy in parallel telephones
  8. Multipurpose Circuit for telephone
  9. Off line Telephone tester
  10. Phone "Hold" With Music
  11. Phone Broadcaster
  12. Phone Busy Indicator
  13. Phone line indicator
  14. Ringing Phone Light Flasher
  15. Simple Phone Tap
  16. Smart Phone light
  17. Soft Musical Telephone Ringer
  18. Telephone amplifier
  19. Telephone Audio Interface
  20. Telephone call meter using calculator & COB
  21. Telephone Headgear
  22. Telephone Hold Button
  23. Telephone line based audio muting and light on circuit
  24. Telephone line monitor
  25. Telephone Line Vigilant
  26. Telephone Number Display
  27. Telephone Ringer using 556 dual timers
  28. The Link 4+0 – Internal Intercom
  29. The Link A2B+1 (the Link Telephone Intercom - DTMF version)
  30. The Link Telephone Intercom – Every Home Should Have One!
  31. The Original 2 Phone Link Design
  32. Two line intercom plus a telephone changeover switch
Test and measurement
  1. Inductive meter adapter
  2. 12V Lead-Acid Battery Monitor
  3. 1GHz Simple Frequency Counter
  4. A simple Remote control Tester
  5. AC Line Current Detector
  6. Audio level meter (vumeter)
  7. Beeper to find short circuits
  8. Capacitance Meter
  9. Car Water Temperature
  10. Contactless Mains Voltage Indicator
  11. Continuity Tester
  12. Crystal Tester
  13. Decibel Meter
  14. Digital Voltmeter
  15. Digital Voltmeter
  16. Electronic Thermostat and Relay Circuit
  17. Frequency Comparator
  18. Function Generator
  19. High Resistance Voltmeter
  20. IR Remote Control Tester
  21. Latching Continuity Tester
  22. Led display digital Voltmeter
  23. Linear Resistance Meter
  24. Mosfet TESTER
  25. Oscilloscope testing module (huntron circuit)
  26. Picoammeter circuit with 4 ranges
  27. Thermostat for 1KW Space Heater (SCR controlled)
  28. Transistor Tester
  29. Triangle / Squarewave Generator
  30. Voltage follower with 1G ohm input resistance
  31. Voltage Monitor
  32. XTal Tester
  33. XTal Tester
  34. Zener Diode Tester
Video and TV
  1. 4 Stage 555 Timer for Video Cam Control
  2. Audio / video switch
  3. Composite color video signal travels on twisted-pair cable
  4. Driver for Multiple VGMonitors
  5. Isolation between antenna network and TV/radio equipment
  6. LH0032 Video Amplifier
  7. S-video to composite video adapter
  8. The Video / Audio Distribution Amplifier
  9. UHF Preamplifier
  10. Video Clock and Message Generator
  11. Video Distributor Amplifier
  12. Video Line Selector
  13. Video monitor adapter enhances oscilloscope
  14. Video multiplexer uses high-speed op amps
  15. Video Signal Amplifier
  16. Video Switch
  17. Video/Audio Wireless Transmitter
Total 529 pages

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