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.
We found this anti-theft circuit in a 90's English publication. The circuit uses common components...
This circuit is from a 1967 publication. The configuration holds true for modern transistors having...
We found this circuit in an old Linear Technology manual. It makes use of the LTC1329 and can be...