amp with very low ground noise

kenny12 · 16th June 2009, 12:19 AM

Hi, im going to need an amp for my desktop speakers, a pair of JBL Monitor 4200, which is an 8ohm load.

I've currently got a digitech amp thats based on a TDA7294 chip, its really noisy when no music is playing. I'm planning on ripping out all the eq bits and just use it as a power amp.

I'm considering placing a whole new amp board in there, what designs have pretty much no noise when no music is playing?

The speakers will be about half a meter from my ears.

ray bronk · 16th June 2009, 05:52 AM

Why don't you go up to Greg ball's site, and either buy the boards, or the assembled boards, or the whole kit for his amplifier. Go to www.ska-audio.com. Done right, it is a killer amp, and it's dead quiet. He separates the grounds.

Ray Bronk

kenny12 · 16th June 2009, 06:43 AM

i'm working with a budget of about 200AUD for everything

pacificblue · 16th June 2009, 07:27 AM

Rip out all the eq parts and see, where that gets you. The TDA7294 is not noisy on its own.

ray bronk · 16th June 2009, 07:38 AM

Hi, Well I would suggest you buy the PCBoards, and then work on getting the parts together yourself. This amp is really a killer, and when done right, it is dead quiet. Trust me on this one, it's worth the build. He had two amps, and one more on the way. I've have mine for awhile now, and I love it a lot. I got the smaller version/lower wattage version. I don't want to sound to much like a commercial, but just go check it out.

Ray Bronk

peranders · 16th June 2009, 07:49 AM

Most amps have very little noise if they are designed properly. Can't see the problem.

theAnonymous1 · 16th June 2009, 08:36 AM

Quote:

Originally posted by kenny12
....its really noisy when no music is playing....

This could be normal depending on how you're utilizing your setup.

Is the volume on the amp all the way up when this happens and are you using the PC as the volume control? Is the noise still there if you turn the volume of the amp all the way down?

If the amp has fairly high gain and you are in fact using the PC as the volume control, then the amp is just amplifying the noise floor of your PC's sound output.

Solution: Don't use the PC as the volume control.

Ted205 · 16th June 2009, 09:03 AM

my guess is the noise is generated by the computer not the amp. You would be better off running a dac before the amp

try the amp with another source.

kenny12 · 16th June 2009, 09:40 AM

its not the soundcard, i've got a headphone amp with no noise, I'll rip out all the eq first and take it from there,

theAnonymous1 · 16th June 2009, 10:10 AM

Quote:

Originally posted by kenny12
its not the soundcard, i've got a headphone amp with no noise, I'll rip out all the eq first and take it from there,

Most headphone amps have much lower gain compared to a power amp.

You didn't answer the question as to how you are controlling the volume.

16th June 2009, 12:19 AM	#1
kenny12 diyAudio Member Join Date: Apr 2004 Location: Aust	amp with very low ground noise Hi, im going to need an amp for my desktop speakers, a pair of JBL Monitor 4200, which is an 8ohm load. I've currently got a digitech amp thats based on a TDA7294 chip, its really noisy when no music is playing. I'm planning on ripping out all the eq bits and just use it as a power amp. I'm considering placing a whole new amp board in there, what designs have pretty much no noise when no music is playing? The speakers will be about half a meter from my ears.

16th June 2009, 05:52 AM	#2
ray bronk diyAudio Member Join Date: Aug 2005	amp with very low ground noise Why don't you go up to Greg ball's site, and either buy the boards, or the assembled boards, or the whole kit for his amplifier. Go to www.ska-audio.com. Done right, it is a killer amp, and it's dead quiet. He separates the grounds. Ray Bronk

16th June 2009, 07:27 AM	#4
pacificblue diyAudio Member Join Date: May 2008	Rip out all the eq parts and see, where that gets you. The TDA7294 is not noisy on its own. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

16th June 2009, 07:49 AM	#6
peranders Electrons are yellow diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 1	Most amps have very little noise if they are designed properly. Can't see the problem. __________________ /Per-Anders (my first name) or P-A as my friends call me BPA300 Group Buy Round 4, SMD-kit and DRV134 pcb, checking interest Sign up HERE Rectifier bridge RFB03 Group Buy Round 2, checking interest Sign up HERE

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16th June 2009, 06:43 AM	#3
kenny12 diyAudio Member Join Date: Apr 2004 Location: Aust	i'm working with a budget of about 200AUD for everything

16th June 2009, 07:38 AM	#5
ray bronk diyAudio Member Join Date: Aug 2005	Hi, Well I would suggest you buy the PCBoards, and then work on getting the parts together yourself. This amp is really a killer, and when done right, it is dead quiet. Trust me on this one, it's worth the build. He had two amps, and one more on the way. I've have mine for awhile now, and I love it a lot. I got the smaller version/lower wattage version. I don't want to sound to much like a commercial, but just go check it out. Ray Bronk

16th June 2009, 09:03 AM	#8
Ted205 diyAudio Member Join Date: Jun 2008	my guess is the noise is generated by the computer not the amp. You would be better off running a dac before the amp try the amp with another source.

16th June 2009, 09:40 AM	#9
kenny12 diyAudio Member Join Date: Apr 2004 Location: Aust	its not the soundcard, i've got a headphone amp with no noise, I'll rip out all the eq first and take it from there,

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