In the figure we have the way to implement a monostable with an operational amplifier LM393. The configuration applies to other operators and the power supply must be symmetrical.
This circuit is from a 1976 technical documentation. The FET can be MPF102 or BF245 and the coil...
This stage can be used in power supplies to increase the current capability up to 10 A. The...
Suggested by an old Popular Electronics, this circuit is based on an uncommon integrated today,...