Multimeter protector C (CB8383E)

Found in a 1966 Electronics World, this circuit applies to the protection of any analog instrument. The diodes can be of any general-purpose type.

| Clique na imagem para ampliar |

Mechanical Oscillator (CB20496E)
This circuit can be used in decoration or to draw attention, in a “fake” assembly for example. What he...
Security Alarm (CB4866E)
This sophisticated alarm with traditional components was found in an ancient American...
1957 1-Transistor Radio (CB14728E)
We found this AM radio in a 1957 transistor application manual, published by Raytheon. The...