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 appears elsewhere on this site. The CMOS gate can be any one, including NAND and NOR...
LEDIL provides through Mouser Electronics a series of lenses for use in greenhouse horticulture....
This circuit adds a beep to turn on with car flashers that do not have this feature. A 47 ohm to...