Tunnel diode trigger (CB21468E)

This circuit was taken from old American documentation. With it, it is possible to generate pulses like a Schmitt trigger, but using a tunnel diode.

| Clique na imagem para ampliar |

Audible Thermometer (CB5017E)
This interesting multivibrator was found in an Italian magazine that no longer exists. This is...
Unijunction Oscillator (CB471)
These days the unijunction transistor (UJT) is not common, but IF you have one you can mount this...
Absolute Value Comparator (CB19482E)
We found this circuit in an old operational amplifier manual. The operational amplifier can be of...