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Digital
- Digital Step-Km Counter
- 7 Segment LED Counter
- Digital Step-Km Counter Circuit Schematic
- Digital Clock with MM5314N
- Frequency Divider
- Frequency doubler with 4069
- Frequency Doubler with 4011
- Frequency Divider with 7490
- LED Traffic Lights
- Set/Reset Flip Flop
- Bistable Flip Flop
- Monostable Flip Flop
- Controlling a relay with a digital logic level.
- Digital Radar Speedometer
- Digital Up/Down Selector for 8 Sources
- Frequency Multiplier X100 with Noise Rejection for low frequency
- Programmable Frequency Divider with 7490
- SamClock Ringer
- SamGordon Digital Clock

For home
- Put That Light Out
- Melody Door Ringer
- Doorbell Memory Circuit Diagram

Fun and games
- Magic Wand Conjuring Trick
- Quiz Circuit
- Magnetic Gun
- 123 Game - All MCU-free
- Electronic Dice
- Digital Roulette with Display
- Electronic Dice
- Game Show Indicator Lights (Who's First)
- The Millipede
- Multi Rocket Launcher
- Mini efficient coil launcher from disposable camera flash
- Downed Model Locator II
- Downed Model Locator
- Combinational Conjuring Trick

General electronics
- Operational Amplifier (Op-Amp) Basics
- Transistor / Diode / IC (DIP) Outlines
- Voltage follower with 1G ohm input resistance
- Op-Amp Booster Designs - PDF
- Upto 73 Op-Amp Circuit Collection - PDF
- 10,000x With One Transistor

High voltage

Air Ionizer
- Negative Ionizer
- Air Ionizer

Jacob's ladder

Miscellaneous HV

Tesla coil
- Solid State Tesla Coil/High Voltage Generator

Infrared

IR remote control

Miscellaneous IR

LED and light

LED driver

Light and music
- PIC16F84A discolight effect with bass beat control

Light dimmer

Light flasher

Neon lights driver
- IC Controlled Emergency Light With Charger Circuit
- Black Light

Metronome
- Mini Metronome
- One second Audible Clock Circuit Schematic
- Precision Metronome and Pitch generator

Microcontroller
- Multitasking Pins
- Simple Universal PIC Programmer
- Ponyprog Circuit for AVR & PIC16F84
- Ponyprog Circuit for ATMEL'S AVR
- PlayPIC®
- Phoenix Programmer
- Gold wafer cards
- Funcard Programmer by Diesel
- EPROM adapter for ATMEL 89 Series Flash Microcontroller Programmer Ver 2.0
- ATMEL 89 Series Flash Microcontroller
- "SimpleMouse" Smartcardprogrammer
- PIC Digital Clock Timer

Miscellaneous
- Quartz Crystal Synchronizer for Pendulum Windup Wall Clock
- Mains Remote-Alert
- Muscular Bio-Stimulator
- Self-powered Sine to Square wave Converter
- Sleeping-Aid
- Doorbell for the Deaf
- Producing your own Decrypt Viewing Card Mk2
- LASER Transmitter/Receiver
- Electronics Attenuator
- Low Ohms Adaptor For DMMs Based On An LM317 Regulator

PC related

Serial and parallel port

USB devices

Power supply

Battery charger

Battery tester
- Self-Powered Fast Battery Tester Schematic
- Battery Tester Circuit Schematic

DC power supply

DC to AC inverter

DC to DC converter

Miscellaneous power

PWM and power control
- Stepper Motor Controller
- Pulse Width Modulation DC Motor Control
- Simple DC motor PWM speed control
- Solid State Power Controller
- DC Motor Control Circuit
- Fancontrol
- Unipolar Stepper Motor Controller
- Temperature-Controlled Soldering Iron
- Varying brightness AC lamp
- Stepper Motor Controller
- Discrete PWM Generator Circuit
- DC Motor Speed Controller
- 12V Speed Controller/Dimmer
- PWM Motor/Light Controller
- Economical Pump Controller
- DC Motor Reversing Circuit

Radio

AM receiver

AM transmitter

Antenna
- Long Loopstick Antenna
- Loop Antenna for AM Radio

Detector receiver

FM receiver
- FM radio (may be used with PC)

FM transmitter

Remote control
- Magnetic-Radiation Remote-Control
- 73 MHz Hallogene Lamp Radio-Controlled

RF amplifier

Signal meter
- Field-strength meter

Sensor

Fluid and humidity

Light sensor

Lightning detector
- Lightning Detector
- Thunderstorm Predictor

Magnetic sensor

Metal detector
- Metal Detector

Miscellaneous sensor

Proximity sensor
- UltraSonic Radar

Sound sensor

Temperature sensor

Touch sensor

Voltage and current

Solar power
- Solar Panel Based Charger And Small LED Lamp
- Solar Cell Voltage Regulator

Sound and oscillator

Animal repellent

Miscellaneous oscillator

Sound generator

Switches
- 220V AC Lamp Toggle Switch Circuit
- Dual Relay Driver Board Circuit Schematic
- Electronic Toggle Switch No1
- Electronic Selector for 8 Sources
- Electronic Selector for 10 sources with Display-Relay Drive
- High Current MOSFET Toggle Switch with Debounced Push Button.
- Relay Toggle Circuit Using a 555 Timer
- Relay Toggle Circuit Using a 556 Timer
- Single Transistor Relay Toggle Circuit
- Single MOSFET Relay Toggle Circuit
- CMOS Toggle Flip Flop Using Push Button
- CMOS Toggle Flip Flop Using Laser Pointer
- Sel 8 Sources Relay

Telephone related

Intercom

Line monitor

Miscellaneous telephone

Telephone bug

Timer
- Bedside Lamp Timer
- NE555 Basic Monostable
- Repeating Interval Timer
- Periodic Timer
- Amplifier Timer
- Photo Timer Circuit
- Tan Timer
- Jogging Timer
- Time Delay Relay II
- Time Delay Relay
- Timed Beeper
- A Tan Timer Circuit Diagram
- Cmos 4017 Sequential Timer
- Two Cmos Based 24-Hour Timers
- A Regularly Repeating Interval Timer
- Repeating Interval Timer No2
- Repeating Timer No3
- Repeating Timer No4
- Repeating Timer No5
- Repeating Timer No6
- Relay Timer switch
- Wide Range Timer
- Timer with buzzer and optocoupler
- 28 LED Clock Timer
- 72 LED Clock
- Digital Clock with Timer and Solar Panel Regulator
- 9 Second LED Timer and Relay Circuit
- 9 Second Digital Readout Countdown Timer
- Low Voltage, High Current Time Delay Circuit
- Generating Long Time Delays
- 555 timer Mono stable (one shot) circuit
- Generating a Delayed Pulse Using The 555 Timer
- Power-On Time Delay Relay
- Power-Off Time Delay Relay
- Midnight Security Light Circuit Schematic
- Safety Guard
- A Bedside Lamp Timer Circuit Schematic
- A Very Useful Timed Beeper Circuit Schematic
- Amplifier Timer Circuit Schematic
- Jogging Timer Circuit Diagram
- Long Delay Timer Circuit Diagram
- Digital Stopwatch 0-99sec
- Digital Stopwatch 0-60sec
- Asymmetric Timer
- 5 to 30 Minute Timer
- 28 LED Clock Timer
- 24 Second Shot Clock
- 24 Hour Timer
- Binary Coded Decimal (BCD) Clock
- PIC Digital Multiple Clock Timer
- Electronic Switch with Delay Time For Lambs

Tools and measuring

Capacitance meter
- Capacitance Meter

Component tester

Conductivity tester

Current and voltage

Miscellaneous tools

Resistance
- Linear Resistance Meter

Thermometer
- Digital Remote Thermometer
- Digital Remote Thermometer

Video
- Video signal emphasis
- Video amplifier 1
- Video amplifier
- Video Isolator Circuit Diagram
- S-video to RCA