Audio Preamplifier (CB18331E)

This small audio amplifier uses germanium transistors and a 12 V supply. The circuit is from a Japanese technical documentation from the 1960s.

| Clique na imagem para ampliar |

Telephone Monitor (CB12655E)
This circuit of a 1978 American publication monitors a telephone line by triggering a relay. The...
FET Transconductance Meter (CB3932E)
This interesting FET-tester circuit was obtained from an old American documentation. The bipolar...
TV Booster (CB23771E)
This old VHF TV booster that also serves FM was found in Radio Electronics magazine from April...