Low voltage dimmer (CB7855E)

This circuit was found in a 90s 303 Circuits. The circuit operates in a 200 Hz switching mode and the output current reaches 5 A.

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Solar Battery Test (CB1355E )
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In figure we have an interesting circuit in which an LED is used as a photoelectric sensor. When...
Microphone preamp (CB22045E)
This circuit is from an old English documentation. It is intended for coupling a microphone to the...