The circuit shown in the figure below is from the 1993 Linear Technology Applications. The operational ones used are uncommon and the use of equivalents can be analyzed.
This integrator circuit uses the junction FETs which can also be the BF245 or MPF102. The...
This 6 V battery charger was found on a 1987 Hands On Electronics. Rc determines the charging...
Found in an American publication from 1968, this circuit aims to keep the torque of a DC motor...