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Is it possible to construct a simple circuit (sans transistors) that would cause a short circuit between two points when a switch is opened? My intuition says no, but I don't have any proof for such a claim.

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    \$\begingroup\$ Does simple include a relay and a DC supply? If so, it's easy as long as the relay has a normally-closed contact... \$\endgroup\$ – Adam Lawrence May 13 '11 at 19:40
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    \$\begingroup\$ what's the reason to have the short circuit when the switch is opened? because, you know, a switch creates a nice short circuit when it closes. \$\endgroup\$ – JustJeff Aug 26 '11 at 0:10
  • \$\begingroup\$ Sounds like an SPDT switch would check the boxes. \$\endgroup\$ – Dampmaskin Aug 17 '16 at 13:13
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Put an inductor in the circuit, and some device that fails as a short circuit on overvoltage.

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    \$\begingroup\$ why not add a circuit to show an example? \$\endgroup\$ – Kortuk May 14 '11 at 7:22
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No. Not without a transistor, relay, or something similar.

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    \$\begingroup\$ Why not add a bit of explanation of why it requires an amplifying element? \$\endgroup\$ – Kortuk May 14 '11 at 7:23

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