PC Sound Card with Stereo Microphone Line Mixer

The circuit is aimed to build a computer sound card with input line in order to use a two mono stereo microphone.

Digital Clock Based on Sam Gordon Theory

The circuit was designed to implement the concept of Sam Gordon in making a digital clock with visible components from the viewer of the clock.

Digital Roulette Circuit with 7-Segment Display

The circuit was designed to produce a digital roulette that will display the result using a 7-segment LED display.

Center Brake Lamp on Car Rears

The circuit was designed to create a brake indication mechanism for cars that will be located at the center rear side and does not only function along with the classic brake lamps, but also when the car is switched ON.

Negative Ion Generator Circuit

The design of the circuit is aimed to produce a device that would remove microscopic particles from the air instead of using fans and filters, by generating negative ions or ionizing the air.

Monitoring Circuit for Telephone Line Usage

The circuit was designed to provide a monitoring scheme for a telephone line where several phones are installed, to indicate when one is being used.