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12/240v relay (DPDT) required for electric screen

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Old 16-04-2003, 9:34 AM   #1
Kramer
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Cool 12/240v relay (DPDT) required for electric screen

OK guys, I've recently acquired an 8' electric screen from an "esteemed" forum member.

Thing is I want to make this baby "remote controllable" using my Denon 3803 receiver.

The Denon has a customisable "12 volt" trigger for screens etc.. It only outputs 20mA at 12v though & most relays (12/240v) I've found have a 200mA coil voltage.

Anyone any ideas for a 20mA 12/240v relay (i.e. 12v 20mA coil switching a 240v "line"), preferably of the DPDT variety?

I can always get a 12/12v relay (with a low coil voltage requirement) & use this to feed a 12/240v relay (200mA), but one relay would be far more convenient.

Ideas anyone?
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Old 16-04-2003, 8:04 PM   #2
themadhippy
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you could use the 12v output via a resitor,to trigger an opto triac, which will switch a 240v relay coil,it would be a good idea to put a diode across the relay coil to protect the opto triac from back emf
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Old 21-04-2003, 12:47 AM   #3
Kramer
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Thanks for the reply

Still looking for a solution to this. I really want to use a relay to prevent any risk of damage to my Denon 3803. There must be a 12/240v relay somewhere with very low coil current

Any other suggestions
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Old 24-04-2003, 5:07 AM   #4
Kramer
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OK, not much info forthcoming on this...

Anyone know of any "electronic" forums etc... or sites with such relays???

Not the usual Farnell etc...I've trawled the usual places...

Would like to get this sorted real soon
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Old 28-04-2003, 3:06 PM   #5
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Have a look at this - not sure what the trigger current is - looks like it might be 50mA at 12V, unfortunately. Might be worth investigating?
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Old 30-04-2003, 12:57 PM   #6
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Have a look here too - a series of relay kits - there are a couple of mains rated vertsions. Give them a ring - I've enquired about things before, and they are very helpful.
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Old 07-05-2003, 12:43 AM   #7
Kramer
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Sorry Richard, meant to reply & thank you sooner

I actually sourced one last week, a DPDT one with a 100mA coil voltage. I tried it & it's A-OK.

Screen finished now - all cabling hidden & fully remote controlled - just need to go about masking it down to 16/9 now.

Thanks again
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