High Power Alarm (CB20475E)

We found this circuit in a Popular Electronics from the 90's. The circuit uses three SCRs to trigger the loads.

Temperature Controller (CB6016E)
We find this circuit in an American 80's documentation. It makes use of IC sensor which is mounted...
Remote Volume Control (CB4476E)
This circuit controls the passage of the signal from an input to an output using a DC signal from a...
RC Coupled One Transistor Stage (CB965E)
This one transistor stage for audio signals was found in an old publication of the year 1958. The...