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.
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We found this circuit in a 1972 documentation. The transistor, in fact, is a unijunction that can...
This circuit for modeling was found in a 1980s documentation. The SCR can be the TIC106 and the...