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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Digitally controlled sawtooth generator (CB8199E)
This circuit, which can act as a shield, was found in an American documentation from the 90s. The...
Notch Filter 3 to 20 dB Bandwidth (CB6714E)
This circuit was found in a 1964 Electronic Design. The transistor may be a current equivalent of...
Three-phase motor control (CB7268E)
Suggested by Sprague in the 1980s documentation, this circuit can control three-phase AC motors....