Field strength meter (CB7358E)

This tuned circuit was found in a 1966 Electronic Circuit Handbook. The transistor can be any modern general-purpose equivalent.

| Clique na imagem para ampliar |

Biorhythm Circuit (CB24531E)
Found in a November 1977 Radio Electronics magazine, this digital circuit was described in an...
Precision Current Source (CB5139E)
This circuit is from a manual of linear integrated circuits of the 80s. The operational is of the...
Sliding tone doorbell (CB20647E)
The tone generated by this bell changes when we press and release the switch. The circuit is from...