Reverse polarity protection relay (CB8905E)

This circuit was found in a 90s EDN. It activates a protection relay in case of reversing the polarity of the supply of a load.

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Crystal unijunction oscillator (CB20679E)
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Variable Gain Instrumentation Amplifier (CB15876E)
This circuit, shown in the figure, consists of a variable gain amplifier with differential input...
Precision Shadow Alarm 741 (CB25479E)
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