Mini amplifier (CB21697E)

The indicated fraction watt amplifier has good gain, requiring only 100 mV input for full power excitation.

People detector (CB22134E)
With this name, the English publication where we found this circuit indicated a sensitive touch...
Product Detector (CB13313E)
This circuit is from 1976 documentation, but it can be assembled with more modern transistors like...
Pierce Oscillator (CB9650E)
This circuit was obtained in an American documentation from the 80's. The transistors can be...