Integrator with JFET (CB6229E)

This circuit was found in an 80s National Semiconductor documentation. The configuration holds true for modern JFETs.

Medium and Short Wave Tuner (CB19267E)
This circuit connected to the input of a good amplifier, with suitable coils can tune stations of medium...
Dynamic Compressor (CB20013E)
This circuit was obtained in an American documentation of 1975. The transistor can be the BC548, and...
Switching Regulator 555 (CB3989E)
The values of the components of this Mullard (Philips) circuit depend on the desired voltages. The...