This circuit was found in a 1965 US documentation. The circuit converts a DC signal to a 400 Hz AC signal. Transformer data was not provided.
In the figure we have the simple way of controlling a load or having a signal from an optical...
This circuit activates a relay that has a lamp as a load. The circuit is from a Radio Electronics from...
Connected to the output of a small amplifier or receiver, this circuit triggers a relay in the...