We found this circuit for video games in a Radio Electronics magazine from August 1977. The transistor can be any common RF type that reaches the desired signal frequency.
In the presented circuit it is possible to vary the frequency of the rectangular signal produced. This...
We found this circuit in a European schematic manual from the 1980s. The circuit is still current, and...
This circuit has a logarithmic response sourcing signals to na analog meter. The meter is a 200 µA or...