20 MHz filter (CB6735E)

This 20 MHz bandwidth circuit was suggested by the National Semiconductor in 1970 documentation. Modern equivalent operational can be used.

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Low power regulator (CB20821E)
This simple voltage regulator with FET was found in American documentation from the 1980s....
Treble Booster (CB12322E)
We found this trebble booster circuit in a 1990 documentation. The components are current, and the...
Stable VFO (CB4050E
) This variable frequency oscillator was found in an old American documentation. Transistors allow more...