This flasher for incandescent lamps was found in Radio Electronics magazine from July 1968. The frequency and duration of the pulses are adjusted in R1 and R3 depending also on C1.
Based on an integrated circuit CA31062 which consists of a photosensor, this circuit was obtained from...
This ultra-simple meter uses an output transformer and a small speaker as a microphone. The...
The frequency of this oscillator depends on the crystal used and the transistors. The circuit was...