Peak Indicator (CB20736E)

This circuit triggers an LED when the input signal exceeds the peak, or the value set in RV1. The transistors can be the modern equivalents BC549.

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Reservoir Level Monitor and Controller (CB17448E)
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This traditional crystal oscillator configuration can use any CMOS gate configured as an inverter. R1...
Simple AC129 or OC80 stage (CB4266E)
This amplification stage circuit with a germanium transistor was found in a 1980s documentation. The...