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 differential amplifier with high input impedance is used in instrumentation. Other...
This circuit was found in a 90s American documentation from the 90s. The components are from that...
This circuit is from an old documentation and can be used to generate signals in different...