Integrator with JFET (CB6229E)

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

Programmable Gain Operational (CB18630E)
This circuit was obtained in an American documentation translated in the 80's. The circuit can be...
Astable CMOS (CB10493E)
This circuit is from a 1998 Electronics Now and can be easily assembled since it uses a common...
90 W Amplifier (CB14272E)
This circuit was suggested by National Semiconductor in its Linear Application Handbook. The...