Switch to power a switch


Old 09-26-08, 10:28 PM
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Question Switch to power a switch

Hi, I'm wiring up something that uses a magnetic reed switch. The system I'm building has too much current for the reed switch to handle and has blown it up. Luckily I bought a couple of reed switches (took a month to receive) and don't want to blow that one up too.

An alternative solution to running the current through the reed switch is to have the reed switch just connected to a regular AA battery of 1.5 volts and when the reed switch is switched on it actually turns on another switch (of some sort) that can handle the current. I've got no idea at present on how to wire this up... anyone got any ideas on how to do this?

Thanks. M.
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Old 09-27-08, 09:08 AM
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You need a relay with a low voltage coil. Check electronic supply houses for one with a low voltage coil that does not exceed the capacity of your reed switch and contacts rated to handle your load.

An electronic circuit with a switching transistor might also work but a relay (aka magnetic switch) would be simpler in my opinion.

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