'Almost No Parts' 12/24hrs LED Clock

Transistor Tester Circuit
A simple transistor tester that identifies if the transistor is a NPN or PNP and indicates if it is working properly. (October 3, 2009)
Categories: circuits electronics - Updated: 2009/10/03

Logic Probe.

LED chaser using PIC 16F84A
A simple LED chaser with 8 LEDs and the PIC microcontroller 16F84A. Hex file and source code included. (August 10, 2009)
Categories: microcontroller circuits - Updated: 2009/08/10

Lie Detector
A simple and easy to make lie detector circuit. (August 3, 2009)
Categories: circuits audio diy science - Updated: 2009/08/03

Audio Oscillator 2-Transistors
A simple direct-coupled oscillator with two transistors. (August 3, 2009)
Categories: circuits audio - Updated: 2009/08/03

Resistors
How to read the color codes of the resistors and tips. (6/25/2006)
Categories: electronics circuits howto - Updated: 2009/08/02

LED Flasher Circuit - Flip Flop
The classic LED flasher flip-flop circuit. Two circuits using NPN and PNP transistors (August 2, 2009)
Categories: circuits light - Updated: 2009/08/02

Led Clock
12Hr Led clock using 16F84 or 16F628. Also, schematic to build a Jumbo clock is included. (6/05/2004)
16F84 version have a problem, pending to be fixed. Updated! (9/6/2006)
Categories: microcontroller circuits diy - Updated: 2009/07/25

Led Chaser II
Led Chaser Version 2, Improved. Use it as "Led chaser" or "Third Brake Light". (1/30/2005)
Categories: microcontroller circuits automobile - Updated: 2009/07/25

LCD Clock/Calendar
LCD Display with Date and Time, 12hr format. (12/12/2004)
Categories: microcontroller circuits diy - Updated: 2009/07/25

Water Level Control/Monitor.
A simple way to control the level of any liquid in any container. (05/20/2004)
Categories: diy circuits microcontroller - Updated: 2009/07/24

Tachometer/RPM II.
This is an improved version of the Tachometer created specially to measure up to 9,999 RPM. Uses a PIC 16F628. (04/24/2006)
Categories: microcontroller circuits automobile homemade - Updated: 2009/07/24

Tachometer/RPM.
Easy to build using only a few components. With some modifications, it can be used in an automobile. This Tachometer uses a PIC 16F628.(06/12/2004)
Categories: microcontroller circuits automobile homemade - Updated: 2009/07/24

Strobe from Flash.
After using a disposable camera, you can build a strobe light (flashing light) with one simple modification. (6/2/2006)
Categories: electronics circuits light diy homemade - Updated: 2009/07/24

Soundmeter
A simple soundmeter using the PIC 16F628 or 16F84 (5/20/2006)
Categories: microcontroller circuits audio - Updated: 2009/07/24

Security Keypad II
An improved version that can be used on security vaults, Doors with electric latches, Alarms, Safety devices and many other uses. It uses an HITACHI LCD (16x1 or 8x1) and a matrix keypad. The HEX code is available for 16F84A and 16F628. (5/27/2006)
Categories: microcontroller circuits diy - Updated: 2009/07/24

Security Keypad.
This Electronic Code Lock uses a 12-keys keypad is used to enter a password and open an electrick lock or any other device with a signal. Uses an 8-pin PIC 12F629. (11/17/2004)
Categories: microcontroller circuits diy - Updated: 2009/07/24

Displays: LED Matrix
Information for the Common Anode LED Matrix Display for SA04-11EWA, NFM-12882BEG-11, LEDM88RG (Updated 7/3/2006)
Categories: electronics circuits - Updated: 2009/07/24

Traffic Light.
A two-way Traffic light using a PIC 12F629. As bonus, a traffic light that doesn't use a PIC is included. (05/13/2004)
Categories: microcontroller circuits homemade automobile - Updated: 2009/07/24

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