1-quadrant logarithmic converter (CB7333E)

This temperature compensated circuit was found in a Popular Electronics from the 90s. Integrated circuits and transistors are from that time.

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Battery Low Indicator (CB4796E)
This circuit triggers the LED when the monitored battery voltage drops below 9 V for 12 V...
Instrumentation Amplifier (CB7825E)
Suggested by National Semiconductor, this circuit can be applied to almost any operational...
Doubler Crystal Oscillator (CB20664E)
This circuit was found in Radio Electronics from the 90s. The circuit can generate signals up to...