2 A photo relay (CB8260E)

This circuit is from a 1970 General Electric documentation. It can be found with variations on this website. The components used are common today.

| 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...