Proportional temperature controller (CB21277E)

This circuit is from an Electronic Design from the 90's. The main integrated circuit is uncommon nowadays.

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Integrated Digital Circuits Test (CB3895E)
We found this circuit in an American documentation of the 80's, being indicated for the test of...
Instrumentation Amplifier (CB20173E)
This amplifier for instrumentation with differential input is from the factory manual of the...
Battery Voltage Monitor (CB23669E)
This circuit is from old technical documentation, used to monitor the voltage of a 12 V battery. The...