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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Oscilloscope calibrator (CB8292E)
This circuit is suitable for calibrating old oscilloscopes. It was found in a 1980s documentation. It...
Regulator with Slow Turn On - TL317 (CB1248E)
This source gently applies the voltage to the load, causing it to rise slowly, thus avoiding...
40 W Amplifier LM1875 (CB6985E)
The integrated circuit used in this Electronics Now amplifier is not very common today. However,...