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.
Circuits similar to this appear elsewhere in this section. The transistors can be BC549 (low...
Indicated to be used at the sensor input of a PC, this circuit was found in an English...
July 2017 - Mouser Electronics announced the availability of Littelfuse's GEN2 series Schottky...