This circuit, which can be found elsewhere on this site, detects positive pulses of a signal. The circuit was suggested in Texas Instruments documentation from the 1980s.
With this circuit it is possible to use a low current switch to switch on and off a high current...
Found on Popular Electronics this circuit has variations found throughout this site and section....
This circuit was obtained in a 1978 publication. The operational amplifier must use a symmetrical source....