Voltage regulator (T455E)

This positive feedback voltage regulator was found in the 1950s MIT documentation. The circuit allows you to adjust the output voltage.

Zero Crossing Switch (CB6009E)
This is a circuit of an 80's American documentation and can be implemented with modern components....
Integrator with bias compensation (CB3939E)
We found this circuit in an old publication. The circuit can be implemented with modern equivalent...
Monostable Using the 4528 (II) (CB133E)
A version of a monostable that uses the 4528, but is triggered by negative transitions of the...