This old circuit, from the 80's, uses an integrated circuit that is uncommon today. The circuit is intended for loads controlled by triac and the resistors depend on the desired control.
This circuit is suitable for isolating audio signals, as it has very low distortion. The used...
We found this circuit in a 1995 documentation. It drives 4 sets of colored incandescent lamps that...
To obtain variable frequency signals, the circuit in the figure is recommended. In this circuit, the...