Low Current Detector (CB6667E)

This circuit is from a 1967 documentation. It makes use of varicap and diode tunnel in addition to currently uncommon FET. It serves as a reference.

| Clique na imagem para ampliar |

Low noise preamplifier (CB12987E)
This low noise audio amplifier stage uses only one transistor and has a high enough gain to...
Audio Preamplifier (CB957E)
This circuit is a from publication 1980, but still can be mounted with BC548 transistors for Q1...
Unit Gain Stage (CB6157E)
This high impedance step suggested by an English publication can operate up to 1 MHz with 1 V rms...