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.
The circuit suggested by National Semiconductor mows signals from a peak determined by the...
Photoelectric cells can be used as sensitive light sensors. However, the low voltage they generate...
The LM150, 250 and 350 series of 3 A are manufactured by several semiconductor industries that...