This circuit was found in a 1969 Mullard publication. The transistor may be the modern equivalent of BC548. Observe the relatively high supply voltage.
This circuit is from an Electronics World of 1967. The described calculations can be applied to...
This circuit uses three oscillators to produce a sound similar to a cricket chirping. Two...
Texas Instruments UCC21225A is available from Mouser Electronics. It is an isolated gate driver...