I did everything you mentioned.No changes in 250Hz. Still at - 85dB. Of course it was measured only by the application on the phone but my ears can hear the noise.
May be the problem is with edcor and needs to be shielding as mentioned by Avitkauskas. The power transformer is already in the steel casing.
How are your PSU boards wired?
You get +VDC, -VDC and Gnd out of both sides of the PSU boards. Normally one boards makes the + VDC and the other makes the - VDC. Is your transformer 2 x 18 VAC or so at the secondary's?
You get +VDC, -VDC and Gnd out of both sides of the PSU boards. Normally one boards makes the + VDC and the other makes the - VDC. Is your transformer 2 x 18 VAC or so at the secondary's?
My psu board is double rail/decoupled stereo by Jeff Young. Transformer is 2x 18 VAC. All wires are in post nr. 3973.
Exactly. I'll check Mountain View cards tomorrow and next mount it to amp. I'll see the noises
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Yes, the Staccato fits, I listened to the Sparkos on a friends system, so I don't know about that one. The Staccoto needs to be the single, the double won't work. The Burson needs to be cut out of it's little case to make it fit.
The bummer is, I didn't think about these tall boys when I designed the amp. I need to lower my M2X boards, or cut a hole, or run with tops off. The are 1/8 to high to put the covers on. I'm actually leaning toward some kind of access panel, so I can swap boards and chips without taking the cover off. It's doable with my setup.
One thing I noticed is the retention of the Staccato is a little weak. If I leave them in, I'm going to get a couple dabs of hot glue, or like to make sure they don't move.
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I did see that about the Burson.
Glad the singles are the ones that fit, saves a little cash.
I need to get going on these, have all of the parts, just need some time.
Glad the singles are the ones that fit, saves a little cash.
I need to get going on these, have all of the parts, just need some time.
No need to try other cards, it doesn't hurt, but if it's the same on both chances are ground issues or Edcore. The power supply is clean right? You don't see anything funky on the supply output?
I've been lucky, or good on my design as none of my 3 MX2 builds has ever had a whisper of hum...
I read where lots of people had issues, so I tried my best in placement. I even have an MX@ running mono config with flying leads and no problems. 😛
What frequencies are you seeing in that ripple. Also, the amount of ripple there seems high by a factor of 10.
Well ya, 2 of those views show around 17mVpp which it okay, but one shows 170mVpp which is way more than I see on mine, by a factor of about 10, so which is it now? Is it 17-18mVpp or 170-189Vpp?
If it's a 100hz then it's unlikely the issue behind your 250hz issue, but it's good to know what the PS ripple/noise is.
From what I see you have a ground or Edcore issue, show us the the supply wave and output waves under load.
If it's a 100hz then it's unlikely the issue behind your 250hz issue, but it's good to know what the PS ripple/noise is.
From what I see you have a ground or Edcore issue, show us the the supply wave and output waves under load.
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The Sparkos dual OpAmp will fit straight onto the dual dip socket. I did angle Q4 alway just a bit for air flow around it.
It was 170mV. 17mV was at probe x10.
As Jeff wrote, 170mV is a good value and if he says so, I believe him.
"Supply wave and output waves " - Please give me more information what you mean.
The photo from the oscilloscope with a visible wave of 170mV is from the power supply output under load
As Jeff wrote, 170mV is a good value and if he says so, I believe him.
"Supply wave and output waves " - Please give me more information what you mean.
The photo from the oscilloscope with a visible wave of 170mV is from the power supply output under load
Jeff knows his stuff for sure.... He's forgot more than I know, so I will turn you to those that know more than I, good luck.....
J
J
Is it a bad thing that I have not screwed the tops on my monoblocks for the longest time? Seems like every time I do, I’m undoing it within a week.
Am I alone?
Am I alone?
Same here although 1xStereo instead of 2xMonoblock.
I'm always swapping in different daughter cards.
I'm always swapping in different daughter cards.
