Medium impedance stage (CB20563E)

We found this circuit in an English publication from 1963. The circuit uses germanium transistors of the time.

SCA Decoder (CB6199E)
This Radio Electronics circuit, in an 80's edition, decodes the 67 kHz signal used at the time to...
Voltage and Current Regulator (CB5876E)
We find this circuit in a manual of the 80's own used components. The circuit provides an...
Microphone Preamplifie (CB1404E)
This circuit is from an old publication of the 70's. It can be implemented with modern transistors like the...