Integrator with JFET (CB6229E)

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

Voltage Reference LM3900 (CB25174E)
This variable voltage reference uses a Norton operational amplifier. The voltage is adjusted at...
Commercial Radio TR26 (CB18383E)
This 6 transistor TR26 commercial radio was sold in Japan in the 60s. It is a super heterodyne circuit...
Transistor Intercom (CB1382E )
n be assembled with BC558 transistors for low power transistors and a BD136 for the output. The...