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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Volume and Bass Control (CB19187E)
This partial circuit that must be added to a preamplifier output transistor as in CB19186E...
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Locking Touch Switch (CB1523E)
We find this circuit in an American publication of 1978. The integrated circuit is the CMOS 4013...