4-tube reflex (T1662E)

This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.

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2 to 10 LED flasher (CB7589E)
Found in American documentation from the 90s, this circuit is ideal for wearables and can be...
Audio Limiter (CB24757E)
This low distortion circuit was shown in the July 1983 issue of Radio Electronics magazine. The...
Current to voltage converter (CB9608E)
Using an operational and a transistor according to the maximum desired current, this circuit...