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.
ROHM Semiconductor is featured in a new line of IR LEDs, Proximity Optical Sensors and Ambient...
Found in a documentation by Hugo Gernsback from 1960, this receiver uses germanium transistors of the time...
In the figure we have the way to connect several 555 to obtain sequential operation. The component...