Digital Counter with an Interval of Kilometers

The circuit has been designed for a person who loves to jog or walk while measuring the distance that have been covered during the activity.

Battery Powered Portable Amplifier for Headphone Use

The circuit was designed for high performance unit as it serves as a portable amplifier for headphones while being powered with 3 Volts.

Programmer and I/O Expansion Board for ATTiny2313

This small controller board allows you to program ATTiny2313, AT90S1200 and AT90S2313 microcontrollers via RS232 port and provides expansion slots for I/O pins.

Three Channel Fan Controller with Temperature Feedback

A PIC16F676 microcontroller based fan speed controller unit which is capable of controlling three groups of 12V DC fans with using temperature feedback.

Replicator Circuit of Cricket Chirping Sound

The purpose of the circuit is to imitate the chirping of the cricket for use as gadgets for amusement and props while being powered by 5V to 12V batteries.

Resistor Value Recorder by PIC16F819 and DS1267

This circuit reads values of an external analog potentiometer, stores them and playbacks continuously by using DS1267 digital potentiometer.