Blown Fuse Alarm (CB6109E)

We found this circuit in a 1967 Electronic design. However, it can be easily implemented even today as it uses only common diodes.

| Clique na imagem para ampliar |

Crystal Doubler Oscillator (CB13866E)
This circuit was obtained in a documentation for radio amateurs from 1975. With it we can use a...
Commercial Reflex Receiver (CB958E)
Only for reference this is a circuito f a commercial receiver of the year 1958. The circuit uses...
Exposure Flash Meter (CB5445E)
This circuit is from an old American publication. The indicated transistor is oversized as the 15 V...