This circuit is from Dutch documentation from 1967. The circuit works with a component of the time, the BRY39, which is uncommon today.
In the figure we have the circuit of an amplifier for alternating signals with 10 times gain,...
Frequencies up to just over 100 kHz can be obtained with an oscillator based on one of the four...
With this circuit it is possible to regulate a source of up to 9 A using 3 LM350. The integrated...