The expansion rate of this circuit is determined by R. The circuit can use any operational amplifier and the power supply must be symmetrical. Resistor R must be less than 10k.
This configuration appears elsewhere on this site. This is from a 90’s Popular Electronics and is valid for...
This circuit was found in a 1980s documentation from the manufacturer of the integrated. The...
Found in an Electronic Design of 1964, this circuit can control up to 20 SCRs in a trigger system...