Optical Communicator Receiver (CB21021E)

Found in documentation from the 90s, this circuit makes use of components from the period. Equivalent components can be employed in a modern version.

| Clique na imagem para ampliar |

Water Level Alarm (CB13962E)
This circuit also detects leaks and rain. I found it in a 1967 English magazine, but it can be...
Touch Switch (CB10567E)
This circuit was published in a 1979 magazine, but it can still be easily assembled as the...
Signal Rectifier (CB13652E)
This precision signal rectifier was obtained in an American technical documentation from 1975. The...