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Old 9th December 2007, 11:04 PM   #1
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Default Trigger switched outlet

I would like to build an AC power outlet that would be switched from the 12V trigger of my preamp/processor. I am not an engineer in any way, but after reading and searching for a while I thought using an optocoupled triac would be a good solution with low parts count.

But... the optocoupled triacs can't handle much current, so it really has to control another bigger triac, but for some reason I don't like the idea of triacs handling big loads.
Then I thought of controlling an AC controlled relay instead. If this design would work I could get away with three parts (including the relay) to get it to work. And I could also control a really big relay if I want to and still only draw something like 10mA of the control signal.

The big question, would this design work at all (as I said, I don't know what I am doing, this circuit is more or less a guess)?

Thanks!
Robert
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Old 11th December 2007, 05:58 AM   #2
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SSR-solid state relay is readily available, however continuous dc will be needed to keep it on.

Gajanan Phadte
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Old 12th December 2007, 08:07 AM   #3
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Thanks for your answer, but the whole idea is to keep parts at minimum and not having to use any external transformer.

Anyone else, would this circuit work?

Regards
Robert
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Old 12th December 2007, 08:45 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
does the Triac datasheet give a glue?
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regards Andrew T.
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Old 12th December 2007, 08:46 AM   #5
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U don't need an external transformer for the SSR. It just replaces what u have drawn and has zero crossover firing.

your ckt then becomes two components i.e. if u want to use the relay otherwise one.
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Old 12th December 2007, 09:02 AM   #6
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what is the part number of the opto isolator triac?

Gajanan Phadte
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Old 12th December 2007, 09:27 AM   #7
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Oh, thanks for all your replies!

I don't have a specific part number yet, if I decide to go ahead I would look at these:

RapidElectronics

Any comment is of course appreciated

Regards
Robert
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Old 12th December 2007, 11:57 AM   #8
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That is an optoisolated triac driver and cannot drive a relay directly.
It is a solid state substitute of a gate driver pulse transformer

I would still suggest u to google for 'ssr' and get some basics.

Gajanan Phadte

-----------------____________---------__--_--_-_-_
I find I have poor convincing power, good I am not selling anything
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Old 12th December 2007, 12:49 PM   #9
paulb is offline paulb  Canada
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An optoisolated triac is a solid state relay. If you have no experience building with high voltage, choose the (pre-packaged) SSR. It might even be cheaper, certainly if you include the cost of your time.
If you look up datasheets and application notes on the optoisolators you'll find enough information to build one. My reference was the Motorola handbook from several years ago.
There's nothing wrong with triacs handling big loads.
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Old 13th December 2007, 04:09 AM   #10
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ssr triggers at zero croosover point. Not sure about optoisolated triac.
Zero crossover triggering is necessary to reduce RFI.

Gajanan Phadte
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