Automotive tachometer (CB7107E)

We found this circuit in an American documentation from the 90s. The circuit applies to vehicles with contact breaker.

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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...