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.
This low current parallel or shunt type regulator was found in documentation from the 60's. The...
We show in the figure how to implement a current monitor circuit using only an operational...
Using circuits from Analog Devices, this circuit does not need a symmetrical power supply. It is...