We found this circuit in the August 1994 issue of Electronics Now magazine. The circuit is based on the now uncommon CMOS 4046. The frequency range is given by C1.
This circuit was found in an Electronics World of 1969. Transistors are general-purpose types. It...
This circuit is from the book Fun Projects for the Experimenter by Newton C. Braga, published in...
We found this alarm in an English publication from 1978. Although the original power supply is 3...