Short circuit protection circuit (CB21197E)

This circuit was taken from a Popular Electronics from the 1990s. The circuit triggers a relay that disconnects the load.

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CMOS 4001 and 4011 Test (CB19073E)
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The power source shown for powering for small TTL circuits was found on a Radio Electronics...
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This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit...