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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Sensitive Field Strength Meter (CB14900E)
This sensitive field strength meter was found in 1993 documentation. The instrument may be the...
Differential Pair (CB6134E)
This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be...
Unijunction timer (CB21700E)
We found this circuit on the internet. The components are current, and the time depends on C1...