Integrator with JFET (CB6229E)

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

Charge Pump (CB20749E)
No information was given on the inductor enrolled in the common core of this circuit two years 80. The...
Two-Transistor Oscillator (MSB019E)
The circuit is a multivibrator version using two NPN general purpose transistor. This circuit can...
Equalizer RIAA with the 741 (CB7530E)
Found in an English Maplin magazine in 1983, this circuit has an RIAA equalization. We suggest its...