Circuit Wiring Solution

This schema is a sound level meter, very simple, but very effective for your sound system or test bench. This type of schema is also called a VU meter. Abbreviation means "unit volume" is used to express that the average value of a music signal over a short period of time.

The VU meter described here is what is called a type "passive". This means that does not require a separate power source, since the power is supplied by an input signal. This makes it easier to use:. Just connect it to the speaker terminals (polarity does not matter) and is ready to use.