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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Hum filter (CB13031E)
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Driving a 7-Segment Display - 4026 (CB177)
The 4028 CMOS IC not only contains the complete decade counter, but also the 7-segment decoder...
MOSFET Driver (CB7035E)
This circuit was found in an Electronic Design from the 80's. It shows how to use a MOSFET driver with...