GENERAL/MIXED/MISC.
Circuit Exchange International (security, audio, radio...)
Digital Library (see left menu) - Circuit Cellar
Electronics - Aaron's Homepage
Electronics For Beginners & Intermediate Electronics
Electronics On A Budget - Basic Electronics.com
Electronics Tutorials
Electronics Tutorials and Kits - Iguana Labs
How Electronic Gates Work (& how to make one: logic gate) - How Stuff Works
How To (solder, desolder, read electric power meters) - The Electronics Area
How To Draw Schematic Diagrams - Paul Horowitz and Winfield Hill
How Van de Graaff Generators Work (& how to build one: charge pump) - How Stuff Works
Sci.Electronics.Repair FAQ
ALARMS, INDICATORS & SECURITY
Alarms & Indicators Circuit Diagrams (theft preventer, 4 in 1 burglar alarm, water level indicator...) - Electronics Zone
Alarm & Security Circuits (radio wave alarm, motorcycle alarm, 5 zone alarm system...) - Circuit Exchange International
Alarm Circuits (power loss beeper, doorknob alarm, electric field disturbance monitor...) - Discover Circuits
Fridge Door Alarm - Shirly's Schematics & Answers
IR Sensitive CCTV Camera & Light Source - Eddiem.com
CLOCKS & TIMERS
4 Bit Binary Clock Schematic And Parts List - CSGNetwork
A Digital Clock With 7 Weekly Alarms Using The OOPIC - Larry's Technology Web Site
Designing & Building An Interval Timer (555 timer) - Engineering Academy of Southern New England
How Digital Clocks Work (& how to make one) - How Stuff Works
My Nixie Clock Project (tube clock) - mcamafia.de
Propeller Clock: Mechanically Scanned Digital Clock (numbers appear to float in air) - Tjaco's Design Graveyard
Timing Circuits (555 monostable, 5 to 30 minute timer, periodic timer) - Circuit Exchange International
CONTROLLERS
AC Speed Controller - Shirly's Schematics & Answers
How Microcontrollers Work (& how to build some) - How Stuff Works
Motor Controller Circuits (speed controller for fans & coolers, stepper motor controller, direction controller...) - Electronics Zone
DETECTORS & SENSORS
A Good IR Detector - Dan Creagan's Robots
Build A Simple Bat Detector - Tony & Jackie Messina
Build Your Own Metal Detector - Saxons
Electronic Sensors & Related Circuits (dew sensor, color sensor, light barrier detector...) - Electronics Zone
Implementing Infrared Object Detection - Seattle Robotics Society
IR Body Heat Detector - CircuitoZ.net
Low Cost D.I.Y. Bat Detector - Pete's Home Page
OSCILLATORS
A Negative Differential Resistance Oscillator With A Negistor - JLN Labs
Insect Repellent - Circuit Exchange International
Oscillator Circuits (sawtooth wave, variable frequency) - Electronics Zone
Oscillators (audio, astable, crystal...) - Discover Circuits
POWER
+12V/-12V Power Supply Unit - Hobby Of Electronic Circuit Engineering
PCB Layout: Basic Printed Circuit Board Design Guidelines For SMPS Switching Power Supplies - Lazar's Power Electronics Corner
Power Circuits (L200 PSU, boosting regulator current, gyrator...) - Circuit Exchange International
Power Related Circuits (power supplies, battery monitors, voltage doublers...) - reconn's World.com
Power Supply Circuit Diagrams (self switching PS, over/under voltage cut-out, car battery charger...) - Electronics Zone
Power Supply Circuits (transformerless, high voltage/high current, voltage inverter...) - Aaron Cake
Simple 5V Power Supply for Digital Circuits - Tomi Engdahl's Electronics Pages
SOLDERING
Basic Soldering Guide (and desoldering) - Technick.net
The Basic Soldering & Desoldering Guide (includes step-by-step photos) - EPE
Help On Soldering - University of Pennsylvania, Department of Electrical Engineering
How To Solder Like A Pro - Page Wise
TRANSMITTERS, RECEIVERS & REMOTE CONTROL
Build A Simple InfraRed Remote Control - Reynolds Electronics
Experimental Data Transmitter For Fiber Optics - CircuitoZ.net
InfraRed/Radio Remote Control Transmitter/Receiver With PIC - Jap's Electronics Projects
Infra-Red Remote Control (transmitter & receiver) - Aaron Cake
IR Remote Control Jammer - Aaron Cake
Remote Control Circuit Diagrams (radio, ultrasonic, clap activated...) - Electronics Zone
Serial Port Controlled Infrared Transmitter With Pic (for PCs) - Jap's Electronics Projects
Simple IR Transmitter Circuit - Tomi Engdahl's Electronics Pages
Transmitters (radio, tracking) - reconn's World.com
UIR: Universal InfraRed Receiver (for PCs) - Brainy's Emoh Egap
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