This circuit was found in a Signetics documentation from the 1980s. The integrated is a PLL and the SCR is a general purpose type The pitch frequency is given by R1 and C1 as formula next to the diagram.
This circuit, from a 1976 National Semiconductor manual, is intended for current in a load using an...
With each clock of the 555 (negative transition) the 4013 (flip-flop) changes state by activating the...
This windshield wiper interval was found in old documentation. The NPN transistor is general...