This circuit for audio signals was found in the March 1990 Radio Electronics magazine. The circuit uses a unusual optocoupler that can be replaced with an equivalent one.
August 2017 - Mouser Electronics is offering a new range of Ohmite ceramic heat sinks. The new...
This is a typical point scale or moving bar circuit with the LM3915. We found it in old American...
This Wein bridge oscillator provides a sinusoidal 3 to 4 kHz signal. The circuit was found in a...