Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be replaced with equivalents. MOSFET is the critical component of the circuit.
This circuit detects noise peaks at the source of a logic system and is reset by pressing SW2. The...
This circuit was found in a 1980s US publication. It indicates when the phone is off-hook by...
These two circuits are of regulators for currents of the 500 mA order and can be assembled with modern...