Integrator with JFET (CB6229E)

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

Low Power Transistor Amplifier (CB18329E)
This old amplifier, with germanium transistors, was found in a Japanese technical magazine in...
Electronic Tornado (CB25108E)
This is the well-known lightning lamp that was published in the March 1988 issue of Saber...
Variable Frequency Oscillator (CB4050E)
This VFO was found in a 1980s documentation. The central frequency is given by the crystal and the...