Integrator with JFET (CB6229E)

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

High frequency generator (CB20615E)
The integrated circuits used in this oscillator are not very common today, as we obtained it in...
Relativity Converter (CB24751E)
This circuit is suitable for applications in medical, research and industrial equipment. The...
250 kHz Adder Amplifier LM108 (CB3997E)
This amplifier with the LM1098 and LM101 by Motorola from a 1990 manual can be designed with more...