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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6V battery charger (CB6400E)
This circuit was found in a 1967 RCA manual. The transistors are of the time. The adjustment is made to...
Field Intensity Meter (CB17599E)
The L coil of this field strength meter depends on the frequency range in which it must operate. The...
3 to 30 V x 1 A Adjustable Regulatoru 741 (CB16262E)
This adjustable regulator uses the 741 and power transistors and can supply a current of up to 1...