Hall current monitor (CB7384E)

Found in an EDN from the 90's this circuit makes use of unusual components today.

| Clique na imagem para ampliar |

Sound Effects Center (CB17485E)
The transformer for this project found in a 1986 documentation is an output type, found on old...
Temperature controller (CB9306E)
This circuit was found in a Popular Electronics from the 90s. It is based on components still...
Astable with starting circuit (CB21099E)
We found this circuit in an American documentation from the 90's. The circuit makes use of general...