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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Negative supply from positive source (CB8843E)
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We find this circuit in an old American documentation from the 80's. The integrated is from the...
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Found in Radio Electronics from the 90s, in the figure we have conventional voltage doubler with...