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Old 2nd November 2011, 01:52 AM   #1
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Default Switching loudspeaker with relay

I am looking for some design advice for the selection of an appropriate relay and design strategy.

I'm planning to build a circuit to intercept a remote trigger signal and use it to switch a pair of loudspeakers, before passing the signal on to a power amplifier so that I can silence a power off discharge pop that I find annoying.

Does it make sense to switch between the loudspeakers and a dummy load so that the amplifier has somewhere to discharge to ?

When switching, does it make sense to try to use a make-before-break relay so that the amplifier always sees some kind of load when switching ?
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Old 2nd November 2011, 04:32 AM   #2
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Use normal relay and connect as shown.

Gajanan Phadte
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Old 2nd November 2011, 01:33 PM   #3
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My recomendation would be not to put any contacts in the audio path as this would create more problems later, with relay contacts. I would suggest what Morden Short did with there speakers, and put a themistor across the input of the speakers. There will be some heat generated but you are less likely to blow your speakers up. will always be some sort of trade off. What Amp are you using, there may be a fix to stop the discharge. Are you able to turn the speakers off on the amp?
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Old 2nd November 2011, 01:44 PM   #4
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Quote:
Originally Posted by gmphadte View Post
Use normal relay and connect as shown.
Thanks for the diagram.

Would you recommend a make-before-break relay ?
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Old 2nd November 2011, 03:42 PM   #5
AndrewT is offline AndrewT  Scotland
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Look at the Thread where mosFETs replace the mechanical relay.
Look particularly at why the relay solution was being rejected.
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Old 2nd November 2011, 04:24 PM   #6
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If you are intent on using a relay to switch off the speakers, then I would suggest using a solidstate relay 34.81.7.024 SPST 2A relay. about 11.00
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Old 2nd November 2011, 04:52 PM   #7
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Quote:
Originally Posted by AndrewT View Post
Look at the Thread where mosFETs replace the mechanical relay.
Look particularly at why the relay solution was being rejected.
Thanks for the pointer. I'm not sure which particular thread you are referring to.

Do you mean this thread ?
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Old 2nd November 2011, 05:46 PM   #8
AndrewT is offline AndrewT  Scotland
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Yes.
The last post points to another.
http://www.diyaudio.com/forums/solid...ml#post1997422

You can also use these as rail fuses/switches and as crowbars.
Might be worth reading about crowbars as well, to get a feel for what can be done without a mechanical relay.
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Old 3rd November 2011, 04:46 AM   #9
Bonsai is offline Bonsai  Taiwan
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Relays are out. SSR based on Mosfets are in.

My PCB's arrive on Saturday, and I'll assemble and start writing the code hopefully by Sunday.
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