2. amps-preamps
  3. 142369-117192

This question is aimed to TRUE Elec Engineers, not fuse or wire directionality believers.


Has any of you ACTUALLY worked with and recommend a SSR which does not introduce any audible distortion on the speaker line and which can operate with a large range of trigger voltages (12 - 48 VDC, may need to have on board voltage regulator for this range).  I am building a speaker DC protector and do not want to use electro mechanical relays becoz of DC arcing and contact erosion issues.  It needs to be capable of switching up to 15 amps at about 100 volts.

Only TRUE engineers reply please.

Thanks

128x128cakyol
cakyol's avatar
cakyol OP
940 posts
 
@ssg308, can u pls tell me the EXACT model/make of the device u used ?  Also, the KEY is, would it work/disengage in case of a DC fault ?
Thanks

cakyol's avatar
cakyol OP
940 posts
 
@ssg308, since some SSRs internally use back to back SCRs or triacs, they may NOT turn off when the trigger is removed and DC is flowing, which would destroy the speaker in a second under fault conditions.

Thanks
jrh1970
3 posts
 
Hi Cakyol

Darn, a legitimate question on this forum.  Ok, I'm a real EE.  I'm not aware of a high failure rate in amplifiers, but perhaps just that...unaware.  Are you concerned with a specific aspect of your system that you want to protect your speakers with something faster than a fast acting fuse?  I admit to not having used an SSR in your application, but like you, would be curious about any acoustic artifacts associated with putting even a low impedance semiconductor in series with the speaker wiring.  On the other hand, as infrequently as a mechanical relay would be switched hot, i.e., under heavy load, I wouldn't have any concerns about contact erosion or wear for one with contacts that are properly sized.  Also, I'm curious what you were going to use as a derived control signal for the relay of your choice.

Keep us posted on your progress and results!
imhififan's avatar
imhififan
2,181 posts
 
https://www.diyaudio.com/forums/solid-state/295884-speaker-protection-upc1237-mosfet.html
https://www.infineon.com/dgdl/Infineon-IPP_I_110N20N3G_IPB107N20N3G-DS-v02_03-en.pdf?fileId=db3a3043...
michaelgreenaudio's avatar
michaelgreenaudio
1,019 posts
 

Hi Cakyol

It might save some time and effort by going to (as suggested above) some engineering or diy audio sites to ask this question. Reason I say this is because finding someone here who is experienced at swapping out different solid state relays is more than likely to be over the engineering pay grade here.

Not saying there aren't some smart people here, just saying maybe not as specialized as what your hunting for.

good luck

Michael Green

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