This circuit assumes that a pulse produced by S1 has a constant duration determined by R1 and C1.
Here we show a configuration in which we have a control voltage applied from a voltage divider, which...
Other series operational amplifiers, such as MC34072, MC34074, MC35071, MC35072, MC35074 d MC33071...
This “zero crossing detector” was found in a manual of operational amplifiers from the 1980s....