Found in Philips documentation from the 1970s, this circuit uses components from the era. The stability is 0.045% per centigrade degree.
This circuit is from an English publication from 1978. The transistors can be the BC548 and the...
This circuit was obtained from a Radio Electronics issue from January 1989. The indicator is a...
This frequency modulated light transmitter is from a 1990s documentation. The circuit may use...