Found in a 1965 General Electric Hobby Manual, this timer was originally created to operate with photo magnifiers of the time. The circuit can be adapted for other purposes.
Several configurations equivalent to this can be found in this section. This was found in a 1970s...
This circuit is the traditional 555 oscillator that produces a hum in the piezoelectric...
This circuit converts signals from the longwave band of 350 kHz to 500 kHz to 4.35 to 5MHz. The...