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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Long-time 1 Hz flasher (CB25423E)
This circuit is powered by 1.5 V and has a long lifespan as it consumes only 320 uA. The circuit is...
Gain 150 000 amplifier (CB6636E
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With this circuit, from a 1991 publication, it is possible to regulate the output of a symmetric source...