This circuit was found in a 1967 Delco Radio documentation. The circuit has an input voltage of 250 V and the load current is 2 A. The transistors used are from that time.
This is one of the first circuits published on this component. We found it in the September 1950...
We found this circuit in the November 1974 Radio Electronics magazine. The frequency depends on C1...
We found this amplifier for hearing aids or hearing aid using only transistors in a documentation from the...