Signal inverter runs from a 5V rail

摘要

This circuit is designed to be a basic signal inverter. It takes a negative or positive-going voltage signal and inverts it.The circuit consists of a 741 op amp (IC1) and a 555 timer (IC2). IC2 runs as an astable multivibrator which drives a diode pump circuit consisting of diodes D1 & D2 and the 1mu F & 22 mu F capacitors. This generates the negative supply rail for the 741 op amp which otherwise could not deliver a negative polarity signal.