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 is from a simple TTL sequential system using 4 LEDs. The experimental circuit must be...
This amplifier provides up to 15 W of output when powered by a simple 12 V source. The integrated...
This sophisticated timed sonic switch was found in a 2001 documentation. It has a timer with a...