We found this circuit in an English publication from the 60's. The transistors are of germanium of the time and the headphones must be high impedance magnetic.
In the figure we have the circuit of a sweep generator obtained in an old publication. The central...
The circuit is from an Electronics Hobbyst Handbook from the 90s, being valid for panels of the...
This circuit provides a signal that is twice the frequency of the input signal. The circuit was...