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 was obtained in a 1975 filter cookbook. The circuit can use other operational...
This astable TTL with the 7400 integrated circuit appears elsewhere in this section. This version is...
We found this circuit in a 1960 Sylvania transistor manual. The relay can be 12 V and C1...