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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Peak voltage hold (CB21518E)
We found this circuit in an American documentation from the 60s. The circuit can be made with...
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High impedance transistorized stage (CB7468E)
This amplifier step with a transistor has an input impedance of 100k to 10 M. The transistor can be any...