Integrator with JFET (CB6229E)

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

Power Supply from -16 V to +16 V x 2 A (CB1190E)
This interesting source, obtained in a 2001 catalog, can vary the output voltage between -16 and...
Playback amplifier (CB7335E)
Found in Mallory documentation from 1968 this circuit uses an integrated circuit from that time. The...
22.5 V Power Supply Multimete (CB1570E )
Some old multimeters have a high resistance scale including an internal circuit powered by a 22.5...