This circuit found in an American documentation from 1964, alters the duration of a pulse and can operate at frequencies up to 10 MHz. The transistors are from that time.
This is the basic configuration of an operational amplifier sample & hold circuit. The FET and...
The components of this filter are calculated using conventional formulas (see mathematics section of...
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...