Here you will find a range of functioning circuits. Choose one below.


» Binary to 7 Segment Decoder
        This circuit converts a 4 bit binary number and displays the Hexadecimal equivelant on a 7 Segment LED display.

» Telephone Ring Detector
        This circuit indicates visually via an LED when the telephone line is ringing (incoming call). The LED can be replaced by an optocoupler to interface to another circuit to maintain isloation from the phone line.