This circuit is intended for detecting 3 levels power grid voltage, and it can be adapted to operate with the most diverse voltages. The circuit uses neon indicator lamps.
This circuit provides a signal that is twice the frequency of the input signal. The circuit was...
This unusual amplifier configuration is from 1986. The circuit has a high resting current given the...
This circuit is from an 80's American documentation. The circuit uses components of the time which...