This low power circuit was obtained from an American 80's documentation. The circuit indicates the voltage of a battery being trimmed by the trigger point. The transistors can be the BC549.
This circuit triggers a load that depends on the characteristics of the transistor when we touch...
We found this circuit in documentation from the 1970s; The circuit uses Japanese transistors of...
This Intersil circuit was found in a 1980s documentation. Operational are of the time, but current...