Temperature control (CB10167E)

This circuit controls a direct current heating element. Power transistors must be load dependent. The components support modern equivalents.

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Digital Voltage Reference (CB24682E)
The reference voltage for this circuit can be selected digitally. The circuit is from Radio...
RC coupling stage (CB21791E)
This basic circuit for a germanium transistor at the time was taken from a Mullard Manual from...
Square Root Extractor (CB25585E)
Found in the July 1993 Electronics Now magazine, this circuit provides an output voltage whose...