Electronically Controlled Security Door Keyboard

The circuit was constructed to provide a simple electronic lock system based on a single integrated circuit and will require a code of seven digits.

45 Watts Audio Power Amplifier Using HEXFET Technology

The circuit was based on HEXFET technology to create a power amplifier that would produce an output power of 45 Watts.

Graphic Equalizer with 10 Bands of Frequency

The circuit was designed to be able to amplify or attenuate some regions of the acoustic spectrum with the use of a graphic equalizer.