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 was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
The circuit shown in the figure below is suggested by ON Semiconductor (www.onsemi.com), based on...
This old circuit is from the era of analog televisions, serving for technicians to make...