Found in Philips documentation from the 1970s, this circuit uses components from the era. The stability is 0.045% per centigrade degree.
Published in Popular Electronics with the curious name of Obnoxious Noisemaker, this 1968 circuit...
We found this circuit in the July 1992 issue of Radio Electronics magazine. An optical system...
This circuit was found in an English magazine from 1978, but it is still current, just change the...