4-scale millivoltmeter (CB7389E)

Found in Radio Electronics from the 90's, this circuit can be implemented with other operational amplifiers. The power supply is symmetrical.

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500 mW push-pull amplifier (CB21795E)
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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...