The presented circuit measures currents and voltages with precision that depends on the tolerance of the resistors used. The instrument is a microammeter and more scales can be added.
Another useful audio circuit using an operational amplifier is the one shown in the figure. It is a...
This metronome circuit was found in an American 1980s documentation. The circuit uses the 4001...
The circuit shown can be used on an infrared audio link. This circuit is from a Popular...