Voltage reference (CB20820E)

This circuit was found in documentation from the 1980s. The circuit can be designed based on modern components.

Relaxation Oscillator with common Transistors (CB10211E)
We can say that this circuit is equivalent to a unijunction transistor in the relaxation...
Capacitor Tester (CB4443E)
This simple capacitor tester can be used for electrolytes from 1 uF. In one position of S1 the...
Electroscope (CB497)
Static charges in objects Dan be detected by this sensitive electroscope. The meter indicates when the...