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Guest
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 Posted: Fri Sep 14, 2007 12:14 am Post subject: Need to design a small disconnect circuit |
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I need a small circuit that can disconnect AC power (means will have a
relay) when it detects freezing on coil. I have a non working
appliance that I want to power up but also include a antifreeze
circuit design so that when it senses ice or freezing on the coils it
powers off/disconnects the relay/power. can anyone help ? is there any
such circuits
available that can do this job ? |
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Bill Jeffrey
Guest
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| Posted: Fri Sep 14, 2007 12:14 am Post subject: Re: Need to design a small disconnect circuit |
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electsrc@gmail.com wrote:
| Quote: | I need a small circuit that can disconnect AC power (means will have a
relay) when it detects freezing on coil. I have a non working
appliance that I want to power up but also include a antifreeze
circuit design so that when it senses ice or freezing on the coils it
powers off/disconnects the relay/power. can anyone help ? is there any
such circuits
available that can do this job ?
Sounds like you need a small moisture sensor driving a FET. Moisture |
sensors usually are looking for (ahem) moisture, but there is no reason
one shouldn't work for detecting frost or ice. The sensor is easy to
make - two electrical contacts in close proximity but not quite
touching. Put a small DC voltage across the contacts, and look for the
small current that results when they are bridged by moisture. I'm sure
Google will turn up hundreds of sensor designs.
Bill |
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