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Old 5th December 2011, 11:30 PM   #601
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Talking I guess is natural

Cool wow well I didn't know much about editing is just natural for me I guess lol :
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Old 7th December 2011, 01:38 AM   #602
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I spent the whole evening tuning some buzzing noise issues... This amp is the only device of my system that's grounded. It created problem when connecting to "floating ground" devices. My biggest problem is when I connected the DVD player to my DAC using the coaxial cable, it gave quite a buzzing sound.

I finally found that the buzzing came from the coaxial video signal from my provider (that goes to the TV set, then my DVD player is connected to the TV, a nice ground loop here). I had to ground that cable both at the entry point in the house and behind the TV receiver. It's all good on that side now.

I know that I've grounded my amp for safety purpose, but why do the consumer integrated amps, TVs and all of this stuff doesn't have a ground? to avoid those loops and save on support? how can all of this be safe and not our DIY project without a ground?

Martin.
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Old 7th December 2011, 03:49 PM   #603
BMW850 is offline BMW850  Netherlands
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Default Single-Layer Air Coil Calculator

Here you have a Single-Layer Air Coil Calculator:
Pronine Electronics Design - Single-Layer Air Coil Calculator

Regards,
Rudy
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Old 8th December 2011, 01:14 AM   #604
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Old 11th December 2011, 06:51 PM   #605
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Unhappy problems with power supply, any suggestions?

I'm all finished building, meaning everything is put together. (see first picture) Two things are not working right, which may or may not be related.

One, is that I'm getting more voltage from one power supply than from the other. I have a dual power supply. Each uses 40-0-40 secondaries. But I'm measuring 43-0-43 on both. That's probably not a big deal, but after rectification I'm getting 110VDC across the positive and negative of one PS, and 161VDC across positive and negative of the other PS. This shouldn't even be possible (86*1.42=122). Furthermore, this voltage is not divided evenly between positive and ground (100VDC) and negative and ground (62.5VDC). I checked every diode (MUR860) and get exactly 0.403 ohms and no conductance in the two directions for all 8 diodes. Note that all these measurements were taken with no load - that is, positive and negative rails were open, so no current was flowing. They were also taken without filter caps in place. I don't know if that effects my measurements. Please see the second picture for a diagram of the PS, without filter caps.

The other problem is that I keep blowing mains fuses (5amp slo-blo) on start-up, even with my soft start. They don't blow as long as I don't have the filter caps hooked up. I don't know if my soft-start is not working properly, or if it is just not "soft" enough. Maybe it needs a larger timing cap?

Any help is greatly appreciated.
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File Type: jpg DX Blame MKIII Hx assembly 001.jpg (502.5 KB, 392 views)
File Type: jpg diagram of PS 2.jpg (50.0 KB, 347 views)
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Old 11th December 2011, 07:08 PM   #606
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Disconnect everything from the transformers.
Test the transformers individually with nothing connected to them.
Now connect mains power via a bulb tester and test the transformers individually again.

Once you know the transformers are wired up correctly, add a bridge rectifier. Test again. Add the other bridge rectifier. Test again.
Add one pair of smoothing caps. Test again.
Add a second pair of smoothing caps. Test again. Are you getting the message?
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Old 11th December 2011, 07:26 PM   #607
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Default Andrew T instructions are fine Byron

Give it a try ... follow his instructions.

regards,

Carlos
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Old 11th December 2011, 07:33 PM   #608
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Are you sure your polarity is right on both sides? By looking at your picture, it seems you got one amp card backwards. I'm not sure of the polarity of your srew-type caps, but you definitely got one amp card backwards. See pic below.
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Old 12th December 2011, 07:08 PM   #609
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The capacitor 2.2 uF (63V) what is a good capacitor for this position?
And is this capacitor important for the sound of the amplifier?


Regards,
Rudy
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File Type: jpg 2,2uF Cap.jpg (135.2 KB, 305 views)
File Type: jpg 20111212_204127.jpg (231.3 KB, 304 views)
File Type: jpg 20111212_203904.jpg (206.0 KB, 143 views)
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Last edited by BMW850; 12th December 2011 at 07:32 PM. Reason: Picture
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Old 12th December 2011, 07:27 PM   #610
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Byron, nice work! I can see why it took a little longer. Thx for posting a pic. I was looking at the same chassis and torids. I'm looking forward to your review after it breaks in. I'd love to have a set of these boards...........
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