Isolate SMPS from input signals

Frosteh · 17th November 2011, 11:26 PM

I am adding a subwoofer amp and SMPS into my all-in-one switch/dsp/amp and have a small problem. I have no choice but to place the SMPS right next to the inputs. I'm using the SMPS500R from Connexelectronic, which has a very high frequency, so will I ever notice noise or interference from it? If so, would building a small faraday cage around it work to isolate it from the low voltage input signals (I'm worried the SMPS will interfere with the inputs, not the other way around). The amp will be underneath the bundle of input wires and the SMPS will behind the minidsp's and in front of the speakon connectors (up is rear in the picture).

Frosteh · 19th November 2011, 05:07 PM

Anyone?

jitter · 06:06 PM

Putting a shield around the SMPS obviously won't harm the input signals. Make sure the SMPS doesn't get too hot, though...

I can't help but think that cleaning up the mess of wires in your amp will also be beneficial. I'd use shielded wires for the low level signals.
And what's up with the puny wires on the mains entrance? I'd use at least 0,75 mm2 (~ 19 AWG) in the correct colour coding with shrink tube on the exposed parts...

luka · 20th November 2011, 07:36 AM

yea, that is a wire mess... good antennas

darkfenriz · 20th November 2011, 03:46 PM

Putting any signal or power wire close to their respective returns, possibly twisting them in pairs is much more efficient

17th November 2011, 11:26 PM	#1
Frosteh diyAudio Member Join Date: May 2011 Location: Kirkland, WA	Isolate SMPS from input signals I am adding a subwoofer amp and SMPS into my all-in-one switch/dsp/amp and have a small problem. I have no choice but to place the SMPS right next to the inputs. I'm using the SMPS500R from Connexelectronic, which has a very high frequency, so will I ever notice noise or interference from it? If so, would building a small faraday cage around it work to isolate it from the low voltage input signals (I'm worried the SMPS will interfere with the inputs, not the other way around). The amp will be underneath the bundle of input wires and the SMPS will behind the minidsp's and in front of the speakon connectors (up is rear in the picture).

19th November 2011, 06:02 PM	#3
jitter diyAudio Member Join Date: Aug 2004 Location: Eindhoven, The Netherlands	Putting a shield around the SMPS obviously won't harm the input signals. Make sure the SMPS doesn't get too hot, though... I can't help but think that cleaning up the mess of wires in your amp will also be beneficial. I'd use shielded wires for the low level signals. And what's up with the puny wires on the mains entrance? I'd use at least 0,75 mm2 (~ 19 AWG) in the correct colour coding with shrink tube on the exposed parts... Last edited by jitter; 19th November 2011 at 06:06 PM.

20th November 2011, 07:36 AM	#4
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	yea, that is a wire mess... good antennas __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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19th November 2011, 05:07 PM	#2
Frosteh diyAudio Member Join Date: May 2011 Location: Kirkland, WA	Anyone?

20th November 2011, 03:46 PM	#5
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Putting any signal or power wire close to their respective returns, possibly twisting them in pairs is much more efficient

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