Build Your Own VU Meter: LM3915 Circuit Diagram

Description

The circuit is connected in parallel with the output of the power amplifier and provides signal level measurement from the amplifier’s output. Adjusting the resistance value, R1, within the input circuit allows for adaptation of the power reading measured by the loudspeaker resistance utilized.

LM3915

The LM3915 is a versatile operational amplifier (op-amp) commonly employed in various electronic applications. This integrated circuit offers high gain, low input bias current, and excellent stability, making it suitable for amplifying weak signals, building instrumentation, and implementing precision circuits. It typically features three operational amplifier stages, offering multiple gain options and flexibility in circuit design. It is a popular choice for audio amplifiers, sensors, and general-purpose analog circuits.

Circuit diagram

Part list