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Digital
- Build Your 7 Segment LED Counter with a 74LS90
- Build Your Pocket Distance Counter!
- Build Your Classic MM5314N Digital Clock Circuit
- Build a 4069 Frequency Doubler Circuit Diagram
- Frequency Doubler: Build Your 4011 Circuit Diagram
- Build Your 7490 Frequency Divider: A Powerful 2-10 Circuit
- Build a 50Hz to 25Hz Frequency Divider Circuit
- Build Your Own 4017 LED Traffic Light Circuit Diagram
- Set/Reset Flip Flop: Build Your 1-Bit Memory Circuit
- Bistable Flip Flop Circuit: Build Your Stable Electronic Switch
- Monostable Flip Flop Circuit: Build Your Timing Delay
- Relay Control with Logic Levels: Resistor Guide
- Step Km Counter Circuit Design

For home
- Build Your Own Melody Door Ringer Circuit – 7413 & BC550
- DIY Doorbell Memory Circuit: Build Your Own 3V Tale-Tale
- Build Your Automatic Light-Off Circuit – 1V-3V

Fun and games
- Build a Magnetic Circuit: The 1-2-3 Wand Trick
- Build Your Magnetic Gun: A 18V Circuit Design
- Build Your 4 Input Quiz Circuit Diagram
- Build Your Own 4017B Electronic Dice Circuit Diagram
- Build Your Digital Roulette Circuit Diagram
- Build Your Own Electronic Dice: A 9V Circuit Design
- Build Your "Who's First" Game Indicator Circuit!
- Build a Brilliant 30-Socket Circuit Game Schematic

General electronics
- LM11 Voltage Follower: 1G Ohm Circuit Design & Building
- Op-Amp Inverting Amplifier Circuit Diagram: 1K & 10K Build Your Own
- Unlocking Electronic Designs: Transistor Diode IC Circuit Diagrams
- Op-Amp Booster Designs: Powerful Circuit Solutions
- 40x Gain with BC547: Achieve 10,000+ Amplification

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 Design

Metronome
- Build Your Own Mini Metronome: Circuit Diagram (40-208 BPM)
- One-Second Clock Circuit: Build Your Precise Timing System

Microcontroller
- Multitasking Pins: Clever Circuit Design with 5V
- Simple PIC Programmer: Circuit Diagram & Inspiring Build

Miscellaneous
- Build a Visual Doorbell: Circuit Diagram & "Please Wait" Illumination
- Mains Alert Circuit Diagram: 135KHz Build Guide
- 3V Bio-Stimulator Circuit Diagram
- Self-Powered Sine to Square Wave Converter Diagram
- Build Your Sleep Circuit Blueprint

PC related

USB devices

Power supply

Battery charger

Battery tester
- Build Your Own 30V Battery Tester Circuit Schematic
- Fast Battery Tester Schematic: 3V-15V Test

DC power supply

DC to AC inverter

DC to DC converter

Miscellaneous power

PWM and power control
- 12V DC Motor Control Circuit: Build Your Own!
- Build Your Own Fan Control
- Pulse Width Modulation DC Motor Control: A Simple 6V Circuit
- 555 PWM Speed Control: Circuit Diagram & Explanation
- Variable Power Controller with 555 Timers
- Build Your Own Stepper Motor Controller Circuit 1K
- Unipolar Stepper Motor Driver Circuit Diagram
- Varying Brightness AC Lamp Circuit Design
- DIY Temperature-Controlled Soldering Iron Circuit Diagram 400°C
- 12V Motor Speed Controller/Dimmer Circuit Design
- DC Motor Speed Controller: 1.4V Variable Voltage Circuit
- Discrete 8-Bit PWM Generator Circuit Design
- Stepper Motor Drive with TDA2030 Circuit Design

Radio

AM receiver

AM transmitter

Antenna
- Long Loopstick Antenna Circuit Diagram: 213uH Design

FM transmitter

Remote control
- Build Your 73 MHz Hallogene Lamp Remote Control Circuit
- 35KHz Remote Control Circuit Schematic

Signal meter
- Build Your Own Field-Strength Meter Circuit Diagram

Sensor

Fluid and humidity

Light sensor

Lightning detector
- Lightning Detector Circuit: Build Your Storm Warning Device
- Build Your Own Lightning Predictor Circuit – 300kHz

Magnetic sensor
- DIY EMF Detector Circuit: Build Your Own 50-100kHz Sensor
- Build Your Own Magnetic Field Detector – Circuit Diagram

Metal detector
- Build a 5.5MHz Metal Detector Circuit Diagram

Miscellaneous sensor

Sound sensor

Temperature sensor

Touch sensor

Voltage and current

Solar power
- Build Your 5W Solar Charger & LED Lamp Circuit
- Simple Solar Cell Voltage Regulator Circuit Diagram

Sound and oscillator

Animal repellent

Miscellaneous oscillator

Sound generator

Switches
- Build Your Own Toggle Relay Circuit – 5 to 15V Power
- Build Your 8-Source Electronic Selector Circuit Diagram
- Build a Robust MOSFET Toggle Switch Circuit – 12V, IRFZ44
- 555 Timer Relay Toggle Circuit Diagram 100uF Capacitor
- Relay Toggle Circuit: 556 Timer Delay Design
- Build Your 12V Single Transistor Relay Circuit
- MOSFET Relay Circuit: Build Your 6V Toggle System
- CMOS Flip Flop Toggle Relay Circuit Diagram 4013
- CMOS Toggle Flip Flop: Laser Pointer Circuit Diagram
- 230V AC Toggle Switch Circuit: Build Your Own!
- Dual Relay Driver: Boost Sensitivity with BC547 Circuit

Telephone related

Intercom
- Build Your Robust Intercom System: A 2W Powerhouse!
- Build Your 22V Intercom Circuit: A Practical Guide

Line monitor

Miscellaneous telephone

Telephone bug
- Build Your Own FM Bug: Circuit Diagram & Parts

Timer
- Amplifier Timer Circuit Diagram 15 Minute Auto-Off
- 30 Minute Bedside Lamp Timer Circuit Diagram
- Build Your Precise 9-Minute Jogging Timer Circuit Diagram
- NE555 Monostable Circuit: 1.1msec Timing Explained
- Build Your 4017 Decade Counter Sequence Circuit
- 24-Hour CMOS Timers: Build Your Own Circuits
- Build Your Interval Timer: Precise Timing Control
- Astable Oscillator Timer Circuit Diagram (1-30 Min)
- Astable Timer Circuit Diagram: Light-Sensitive Timing
- Repeating Timer No4: Build Your Dark-Activated Circuit
- Astable Timer Circuit Diagram – Build Your Own!
- Build Your 6-38 Minute Periodic Timer Circuit Diagram
- Build Your 100uF Photo Timer Circuit – Precise Timing!
- Adjustable Interval Timer: Build Your Precise Timing Circuit
- Build Your Own: 100s Delayed & Multi-Range Relay Timers
- Build Your 1min-20hr Wide Range Timer Circuit
- Tan Timer Circuit: Build Your Perfect Sun-Kissed Schedule
- Build Your Own 20-Second Time Delay Relay Circuit
- Build Your Own Time Delay Relay Circuit - 6V Design
- Timed Beeper: Build a 7.5s Delay Timer Circuit
- 74HCT4017 LED Clock Timer Circuit Diagram
- 60 LED Clock Circuit: Build Your Stunning Time Display!
- Build Your Solar-Powered Digital Clock Masterpiece
- Build Your 9-Second LED Timer & Relay Circuit 9V
- Build a Powerful 1300W AC Heater Circuit Design
- Time Delay Circuit: 5A Output from Low Voltage Batteries
- Build Precise Time Delays with a 12-Stage Binary Counter
- 555 Timer Mono Stable Circuit Design & Build Guide
- Building a 1-Second Delayed Pulse with the 555 Timer
- Build a Powerful 1300W Space Heater Circuit Diagram
- Delay Relay Circuit: 12V, 15s
- Midnight Security Light Circuit: A 1:00 AM Intrusion Defense
- Time Delay Circuit: Build Your Appliance Protector
- Build Your 30-Minute Bedside Lamp Timer Circuit
- Timed Beeper Circuit: Build Your Precise Timer!
- Build Your Amplifier Timer Circuit – 15 Minute Delay
- Build Your Custom 3-9 Minute Beep Timer Circuit
- Long Delay Timer Circuit: 35 Minute Battery-Powered Design

Tools and measuring

Component tester

Conductivity tester

Current and voltage

Miscellaneous tools

Thermometer
- Precision Temp Frequency Meter Schematic

Video
- Boost Your Video Clarity: A 3-Transistor Circuit
- Build Your Own LH0032 Video Amplifier Circuit Diagram
- LM359N Video Amplifier Circuit Diagram: Build Your 1Kohm Design
- DIY Video Isolator Circuit: Eliminate Hum & Interference

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