LM3900 Positive Differentiator (CB5054E)

The circuit shown in the figure has an output voltage rise time of 0.22 ms and an input time constant of approximately 1 ms.

Controlled Oscillator (CB12683E)
An oscillator that can be frequency controlled by a resistive sensor is shown in the figure. The...
Transistor Replacement Box (CB21670E)
The idea of this circuit from a 1960 publication is simple: we can switch the transistor being...
Tunnel diode curve tracer (CB23704E)
This circuit was found in a Radio Electronics from February 1966. With it it is possible to trace...