This circuit, with printed circuit board included, is from a Radio Electronics magazine from July 1971. The SCR can be any equivalent of the 106 series.
We found this interesting effect circuit for LEDs in a 1993 publication. The circuit uses very...
This circuit was found in an American documentation from 1968. The configuration can be adapted to...
In the figure we show how to implement an audio oscillator with the 741 integrated circuit by...