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> Control A Triac From A Pc?
Wombat
  Posted: February 02, 2010 11:55 pm
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Hi all,

I'd like to control a Triac from a PC but I don't know where to start. Can anyone give me a pointer or two please?

Thanks very much.
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MacFromOK
Posted: February 03, 2010 12:10 am
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You need a program to provide an output signal, and then get that signal out of the computer thru a parallel/serial port, USB, or dedicated card. Additional circuitry is required for signal amplification and to isolate the computer from possible damage (some dedicated cards have provisions for these).

There are numerous triac tutorials and drive circuits online, but here's some basic info that many do not mention:
http://daycounter.com/LabBook/TRIAC-Tutorial.phtml

What device do you want to control, and what is your experience level? A triac may not be the best option.


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cdstahl
Posted: February 03, 2010 02:02 am
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There is a fairly common optotriac + power triac circuit.
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Sch3mat1c
Posted: February 03, 2010 02:18 am
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QUOTE (Wombat @ February 02, 2010 04:55 pm)
Hi all,

I'd like to control a Triac from a PC but I don't know where to start. Can anyone give me a pointer or two please?

Thanks very much.

user posted image

Joking aside,

Use an MOC3020 (an isolated photoTRIAC) to trigger a bigger TRIAC. A typical circuit is probably in the datasheet.

Tim


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