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 has some differences from the conventional types of control in which the delay in the...
This interesting AC / AC converter is only indicated for resistive loads and was obtained in a...
This circuit consists of an electret microphone amplifier powered by a 12 V voltage. A regulator is...