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 was found in a 1992 documentation and has excellent sensitivity, using components that...
January 2017 - Texas Instruments' new TLVx172 operational amplifiers with Rail-to-Rail outputs can now be...
June 2017 - Texas Instruments' new TPS61178x synchronized boost converters that already include...