555 Circuits

Basic circuits and information about this timer/oscillator. (11/6/2006)
Category: electronics circuits - Updated: 2009/07/23

555 Circuits II

Some useful circuits using the LM555 IC. (11/26/2006)
Category: electronics circuits homemade - Updated: 2009/07/23


Some useful Circuits with LEDs using the AC voltage. (5/28/2006)
Category: circuits electronics - Updated: 2009/07/23
ANP 16F84A 16F628A microcontroller PIC LED clock with display control

'Almost No Parts' 12/24hrs LED Clock

A 12hr/24hr LED Clock with display control, uses a microcontroller PIC 16F84A or 16F628A and a few parts. (August 25, 2009)
Category: microcontroller projects circuits - Updated: 2014/03/02
Two transistor audio oscillator

Audio Oscillator 2-Transistors

A simple direct-coupled oscillator with two transistors. (August 3, 2009)
Category: circuits audio - Updated: 2009/08/02
CGA video card

Computer to TV adapter.

Simple adapter to connect an old computer with CGA video graphics card to any TV. (11/26/2007)
Category: homemade diy circuits computer - Updated: 2009/07/23
diodes circuits - Dual voltage circuit with silicon diodes

Diode Circuits

A collection of simple but useful circuits made with silicon diodes. (6/14/2006)
Category: electronics circuits - Updated: 2009/07/23
Piezoelectric from a Watch clock

Electricity from Piezoelectric materials

Easy experiment that shows how to get electricity from Piezoelectric materials, a clean source of electricity. Also, some interesting applications. (11/13/2008)
Category: science projects circuits discover - Updated: 2009/07/24
emergency light

Emergency Light.

A simple circuit that activates a light when the power is out. A version with a lightbulb and another with white LED light included. (6/25/2006)
Category: electronics circuits light homemade - Updated: 2009/07/23

Fluorescent Light.

How to build a 4-Watts Fluorescent light using a disposable camera, powered by one 1.5 Volts battery. (5/29/2006)
Category: light diy homemade projects circuits - Updated: 2009/07/23
mini micro fm microphone transmitter circuit schematic

FM Microphone.

A micro-transmitter is so small and sensitive, it have only 8 easy-to-get parts and can be assembled in one hour. (6/3/2006)
Category: electronics circuits homemade - Updated: 2009/07/23
Pinout information of LCD Hitachi

Hitachi LCD Displays

LCD displays Hitachi Compatible, Data and Tips how to use the display.
Category: electronics circuits howto - Updated: 2009/07/23
Circuit of the ColdHeat soldering tool

Homemade COLDHEAT.

My first attempt to build a homemade "ColdHeat" soldering tool. (7/8/2006)
Category: howto circuits diy homemade - Updated: 2009/07/23
Colheat soldering tool

How COLD HEAT Works?

This "Hi-tech" soldering tool looks like a miracle. Does it Really Work? (7/13/2005)
Category: howto circuits how_it_works - Updated: 2009/07/23

How Battery-free Flashlights Works.

It sound too good to be true. Let's see how these battery-free flashlights works. (5/20/2006)
Category: light circuits electronics - Updated: 2009/07/23

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