This very complex circuit in terms of the number of transistors was found in Radio Electronics from March 1966. The circuit is for low impedance headphones. The transistors are from the time.
With the name of transitube we find this MW receiver in documentation from the 50's. It uses a...
This type of circuit is interleaved between a microphone and a transmitter in order to improve the...
We found this circuit in an Electronics Now magazine from June 1995. The transformer has a primary...