This medium power circuit is from an English publication from 1989. The integrated circuits are of types that are still obtainable. The power supply must source at least 2A.
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A frequency divider for digital signals can be constructed based on a single 4018 integrated...
This transmitter emits a modulated signal at a frequency given by the first transistor in the...
The figure shows how to use an LM3914 with a variable range moving point. The circuit has an...