We find this circuit in an American 80's documentation. No further information about the transformer is given. The circuit serves as a reference for any repair work.
This circuit mimics the trill of a bird. We found it in an American documentation from the 90s. It is...
Found in Radio Electronics from the 90s, this circuit uses a 741 and can be changed to other...
This power supply with several transistors can supply a current of several amps and a voltage of...