My M3 (or Jazper's M3 Monster)
Jun 15, 2005 at 9:53 AM Post #16 of 73
thats fair enough then
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i hate how there are just those few things RS and Farnell and Xon don't have, they always end up being the ones u need and incorporating shipping theyre the priciest
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Jun 15, 2005 at 9:57 AM Post #17 of 73
Quote:

Originally Posted by skyskraper
thats fair enough then
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i hate how there are just those few things RS and Farnell and Xon don't have, they always end up being the ones u need and incorporating shipping theyre the priciest
etysmile.gif




well there are two things with it, first of all I wanted to use vishay dale resistors throughout, and second I wanted panasonic FM or nichicon UPW caps for the power supply. I bought overseas mainly because of brands/quality/performance. I want the best I can get within reason.
 
Jun 15, 2005 at 10:17 AM Post #18 of 73
u can get those caps locally RS and Farnell have them. the only pita is the vishay dale's. but i use philips resistors, theyre quite nice, i couldnt hear a difference with them to VD's.
 
Jun 15, 2005 at 10:33 AM Post #19 of 73
at this point I'm considering a 1u rackmount and fitting an acrylic window in the top .. it'd be easier to cut if nothing else
 
Jun 15, 2005 at 11:00 AM Post #20 of 73
Quote:

Originally Posted by Jazper
at this point I'm considering a 1u rackmount and fitting an acrylic window in the top .. it'd be easier to cut if nothing else


And you could show off the pretty p-o-r-n inside.
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Jun 15, 2005 at 11:27 AM Post #21 of 73
i was thinking about getting a nice honeycomb mesh for mine, could be an option for you, havent been to the local Al supplier lately but im sure they'll have something suitable
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Jun 15, 2005 at 11:34 AM Post #22 of 73
Quote:

Originally Posted by amb
And you could show off the pretty p-o-r-n inside.
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if I did that I'd have to play waka waka 70s p-o-r-n style music on it, it's too good for that.
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Jun 15, 2005 at 11:43 AM Post #24 of 73
Quote:

Originally Posted by peranders
Don't forget that you have one week at the most because you have a time limit on editing.



no big deal, I can make posts here
 
Jun 15, 2005 at 12:30 PM Post #25 of 73
Quote:

Originally Posted by Jazper
As for rectifier diodes, diyaudio people seem to like the MUR820, which is overkill but cheap enough to use, so I plan to use a reasonable clone of it.


This diode isn't especially good. The type is known and this is enough I think. I'll believe you have 1000's of different types to choose from. Compare the situation of recommended opamps. We have AD8610, AD797, OPA134, OPA627 and a couple of more but in real life there are 100's of more or less suitable types.. so this isn't any absolute science.
 
Jun 15, 2005 at 1:00 PM Post #27 of 73
Quote:

Originally Posted by Jazper
Now P-A's design is beautiful, but it doesn't include a bridge rectifier or smoothing caps, My default choice for caps is nichicon UPW, but it turns out that panasonic FM are cheaper and I'll be ordering from digikey anyhow so they'll be what I use. I'll put these together with the rectifiers on protoboard. 6x1000uF 50v


In a not too far future I will have a complete super power supply, some time in the fall maybe.
http://www.sjostromaudio.com/hifi_fi...0schema_p1.pdf
http://www.sjostromaudio.com/hifi_fi...0schema_p2.pdf
http://www.sjostromaudio.com/hifi_fi...0schema_p3.pdf
 
Jun 15, 2005 at 1:16 PM Post #28 of 73
/edit: Nope simply wrong button
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New thread I wanted
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Jun 16, 2005 at 7:11 AM Post #30 of 73
Quote:

Originally Posted by Jazper
The voltage reference given in P-A's stock part list is LM431, he says the LM329 is better, so based on that, that's what I'm going to use.


First we are talking about industrial parts so if the industry wants to pay more for something it must add a certain value.

So in the case LM329 and LM431 there are differences'

LM329, 199, 399 is no precision part when it comes to absolute accurecy. The major good parameter is low noise and it's also mentioned and specified in the datasheet although pretty rough, 7-100 uV! The very good thing about LM329 is very low temperature coefficient which is rather unimportant in audio.
The bad thing (sometimes) is that it can't be adjusted.

LM431 hasn't got any noise data but it is higher, still in real life with LP-filter the regulator has pretty low noise, way better than needed in most cases.

So if you want more than 6.9 volt and a very temperature stable output voltage LM329 is OK. If you want to save same money and in the same time want voltages från 2.5 V and up and also want to be able to tune the voltage in an easy way LM431 is to prefer.

Strict technically LM431 together with some additional parts is way better than any regular 3-pin regulator which is normal in high-end!

.... so if you want more than 6.9 volt LM329 is excellent but LM431 is quite enough.
 
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