Manual Heater Control (CB21276E)

Found in an Electronic Design from the 90's, this circuit uses an SCR according to the controlled power. The circuit is for 12V heating elements.

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Automatic gain control for audio (CB20640E)
This circuit was found in an American publication called Ham Radio. The circuit uses still current...
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From an audio signal, this circuit gets two signals of the same amplitude and opposite phases....
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Found in an Electronic Design from 1968 this circuit generates a linear sawtooth signal modulated...