This circuit provides a reference voltage for calibration. He uses a diode in a small thermal chamber. We found this circuit in an old american documentation.
The L200 integrated circuit consists of a 5-terminal current regulator in a TO-22O enclosure that...
The load on this amplifier is 8-ohm. We found the circuit in a 1972 Motorola amplifier manual. The...
Published in Radio Electronics magazine in March 1963, this circuit uses 4 transistors of the...