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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Rain Detector (CB25963E)
We found this circuit in the May 1996 Electronics Now magazine. The relay must have a voltage...
TTL Optical Interface (CB14159E)
The shield circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor of 1994....
DC Motor Control with Direction Change (CB913E)
Up to 0.5 A DC motors can be controlled by this circuit. Direction change is achieved by a logic...