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Old 8th September 2005, 06:35 PM   #1
Magura is offline Magura  Denmark
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Default How to make a solid state relay?

How can I make a solid state relay? Is there more to it than a big mosfet and an opto coupler?

Cheers

Magura
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Old 8th September 2005, 06:43 PM   #2
oPossum is offline oPossum  United States
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Additional parts would be required for...
- Overvoltage protection
- Overcurrent protection
- Overtemperature protection
- ESD protection
- Zero crossing switching (AC relays)
- etc...

If you don't need these features, then an opto, transistor and a few resitors would probably work fine.
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Old 8th September 2005, 06:49 PM   #3
mzzj is offline mzzj  Finland
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Default Re: How to make a solid state relay?

Quote:
Originally posted by Magura
How can I make a solid state relay? Is there more to it than a big mosfet and an opto coupler?

Cheers

Magura

1mA or 100A? 1v or 1000V
from big mosfet i could assume...something
What do you want to do with your SSR?
Just want to do it by yourself or is there some reason not to use standard products from companies like cp-clare or phoenix?

And yes, thats about what is needed in real basic case. real-word working circuits may have plenty of other components also depending on application...
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Old 8th September 2005, 06:58 PM   #4
Magura is offline Magura  Denmark
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I need to switch 16VAC 20A. The SSR's I've seen so far will not work under 24V.

I also need to switch 60VDS 2A. This is not a problem to find an off the shelf part for though.

Cheers

Magura
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Old 8th September 2005, 07:02 PM   #5
Magura is offline Magura  Denmark
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Default Re: Re: How to make a solid state relay?

Quote:
Originally posted by mzzj



What do you want to do with your SSR?

I would like to switch between windings of PSU trafos in class A amps and the small one would be for the same purpose in a pre amp.

Cheers

Magura
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Old 8th September 2005, 08:59 PM   #6
Mark Kravchenko --- www.kravchenko-audio.com
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Default How about .....

A triac.

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Old 8th September 2005, 09:06 PM   #7
Magura is offline Magura  Denmark
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Default Re: How about .....

Quote:
Originally posted by mwmkravchenko
A triac.

Mark
Please explain.

Cheers

Magura
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Old 8th September 2005, 09:11 PM   #8
Mark Kravchenko --- www.kravchenko-audio.com
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Default Check out the link and see how he used it.

http://www.passdiy.com/pdf/a75p2.pdf


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Old 8th September 2005, 09:17 PM   #9
Magura is offline Magura  Denmark
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Hmm, almost too simple to be true.

Thanks a lot Mark.

Magura
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Old 9th September 2005, 12:41 PM   #10
Mark Kravchenko --- www.kravchenko-audio.com
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Talking I'm here for you

Happy to help.

You me and the eskimos go way back!

By the way nice job on those rotary switches.

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