This General Electric circuit is from the 80's. The PUTs used in this meter are not common components today.
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...