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Alarms and security

Alarm

Automotive alarm
- A Cmos Based Vehicle Anti-Theft Alarm
- Vehicle Anti-Hijack Alarm No3

Lock

Miscellaneous security
- PIC Security System Dials Your Cell Phone
- Emergency Light and Alarm

Motorcycle alarm

Audio

Audio amplifier

Audio filter

Audio mixer

Audio preamplifier

Sound level meter

Speaker protection

Tone and volume control

Automotive

Automotive light

Automotive miscellaneous

Car battery related

Digital
- 7 Segment LED Counter
- Digital Step-Km Counter
- Digital Clock with MM5314N
- Frequency doubler with 4069
- Frequency Doubler with 4011
- Frequency Divider with 7490
- Frequency Divider
- LED Traffic Lights
- Set/Reset Flip Flop
- Bistable Flip Flop
- Monostable Flip Flop
- Controlling a relay with a digital logic level.
- Digital Step-Km Counter Circuit Schematic

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

Fun and games
- Magic Wand Conjuring Trick
- Magnetic Gun
- Quiz Circuit
- Electronic Dice
- Digital Roulette with Display
- Electronic Dice
- Game Show Indicator Lights (Who's First)
- 123 Game - All MCU-free

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

High voltage

Miscellaneous HV

Infrared

IR remote control

Miscellaneous IR

LED and light

LED driver

Light dimmer

Light flasher

Neon lights driver
- IC Controlled Emergency Light With Charger Circuit

Metronome
- Mini Metronome
- One second Audible Clock Circuit Schematic

Microcontroller
- Multitasking Pins
- Simple Universal PIC Programmer

Miscellaneous
- Doorbell for the Deaf
- Mains Remote-Alert
- Muscular Bio-Stimulator
- Self-powered Sine to Square wave Converter
- Sleeping-Aid

PC related

USB devices

Power supply

Battery charger

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

DC power supply

DC to AC inverter

DC to DC converter

Miscellaneous power

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

Radio

AM receiver

AM transmitter

Antenna
- Long Loopstick Antenna

FM transmitter

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

Signal meter
- Field-strength meter

Sensor

Fluid and humidity

Light sensor

Lightning detector
- Lightning Detector
- Thunderstorm Predictor

Magnetic sensor
- Electromagnetic field detector
- Geomagnetic field detector

Metal detector
- Metal Detector

Miscellaneous sensor

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
- 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
- 220V AC Lamp Toggle Switch Circuit
- Dual Relay Driver Board Circuit Schematic

Telephone related

Intercom
- High Quality Intercom
- Intercommunication (Intercom)

Line monitor

Miscellaneous telephone

Telephone bug
- FM Telephone Bug

Timer
- Amplifier Timer
- Bedside Lamp Timer
- Jogging Timer
- NE555 Basic Monostable
- 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
- Periodic Timer
- Photo Timer Circuit
- Repeating Interval Timer
- Relay Timer switch
- Wide Range Timer
- Timer with buzzer and optocoupler
- Tan Timer
- Time Delay Relay
- Time Delay Relay II
- Timed Beeper
- 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 Tan Timer Circuit Diagram
- A Very Useful Timed Beeper Circuit Schematic
- Amplifier Timer Circuit Schematic
- Jogging Timer Circuit Diagram
- Long Delay Timer Circuit Diagram

Tools and measuring

Component tester

Conductivity tester

Current and voltage

Miscellaneous tools

Thermometer
- Digital Remote Thermometer

Video
- Video signal emphasis
- Video amplifier 1
- Video amplifier
- Video Isolator Circuit Diagram

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