Temperature regulator CIR21824S (CB21289E)

This zero-crossing switch circuit was found in documentation from the 1990s. GE's PA424 is the main element of the circuit, uncommon today.

| Clique na imagem para ampliar |

Fast logarithmic converter (CB9613E)
Found in old documentation, this circuit makes use of amplifiers of the time, uncommon today. Next...
Doorphone and Doorbell (CB18111E)
Although quite simple, the usefulness of this circuit is great. It can even mean gains for those...
Direct Read Inductance Meter (CB12437E)
This circuit converts inductances on two scales into voltages. The circuit was obtained from a...