Integrator with JFET (CB6229E)

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

Double limit test (CB9593E)
This precision circuit can be implemented with other operational ones. We found it in a...
Bench Calibrator (CB19196E)
This circuit is tuned to produce pulses of 1.5 ms and 5.5 ms of separation for various settings with...
Tone Control Preamplifier (CB18561E)
This preamp with several inputs using germanium transistors from the time was found in Japanese...