In the figure we have 3 oscillators with logic gates that can be triggered by external logic signals. The circuits were found in the Radio Electronics magazine of April 1987.
This amplifier uses the LM358, this operational amplifier with excelents characteristics for this...
The outputs of each switch position are determined by the zener voltage plus the drive voltage of each...
This circuit is found in many LM339 manufacturer's manuals. This is from the SGS manual of...