This circuit was obtained in the 1990 Motorola Linear Databook. The circuit uses a 139 series comparator, but other series can be used. The power source need not be symmetric.
This circuit activates a relay with a delay that can be adjusted in a range of values that depends on...
EZP-Q metallized polypropylene capacitors from Panasonic's can be purchased from Mouser...
This circuit was found in a 1964 Electronic Design. The components are of the time, and modern...