4W Amplifier (CB6205E)

This high gain circuit is from 1969 General Electric documentation. The transistors are of the time, but equivalent types can be tested.

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500 mW push-pull amplifier (CB21795E)
This circuit was found in a Mullard transistor manual from 1960. Note the symmetrical power...
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With the shadow over the sensor, it is possible to interrupt the sound of your amplifier using this...
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This circuit puts the battery in the circuit when the voltage of a source is cut, preventing it...