This circuit was found in the September 1992 issue of Radio Electronics magazine. The circuit does not use a transistor to drive the relay and has no adjustments.
This circuit was found in Philips documentation from 1965. No information was given about the...
This sophisticated decade of benchtop resistors was found in the November 1989 issue of Radio...
This configuration based on a conventional astable multivibrator was found in a 1982 publication. The...