Thermostatic control with mercury sensor (CB21388E)

This former temperature sensor with a mercury sensor was found in a General Electric documentation from 1967. The SCR must match the load.

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Symmetric Power Supply (CB16761E)
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Found in 1980s Electronic Engineering, this circuit uses common phototransistors as sensors. The...
Simple Symmetrical 6 V Power Supply (CB20207E)
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