Ringer Circuit Using Sam Clock Method

The circuit was designed based on the operation of a digital Sam clock with a programmed ringer attached to its output and made to function using a relay.

Command-Operated Acoustic Tone

The circuit was designed to create an acoustic tone that can be controlled by giving a command.

Relay-Operated Switch for Over Voltage and Under Voltage

The circuit was designed to provide a voltage over and under the specified value with the use of a switch that will be operated by a relay.

Monitor and Look Out Circuit for Infant/Baby

The circuit was designed for the sole purpose of making a way to watch over a baby while he is left alone in his room.

Programmable Frequency Divider Circuit

The circuit was designed to divide the frequency of a TTL compatible square wave signal which can be programmed with the use of three 7490 to perform the required operation.

Two LED Flasher by 555 Timer

The purpose of building this circuit is to create a LED flasher with alternating sequence from the two LEDs where the operation is based on the functionalities of a 555 timer integrated circuit.