Building a symmetrical psu B1 buffer - Page 116

sutantoroy · 19th March 2010, 02:01 PM

What is that mean? BG N better or MKP better? I think an elco is an elco, distortion always appear, am I wrong?

Salas · 19th March 2010, 03:42 PM

Where you don't need the many uF and the space is OK to fit, a film is inherently better. Especially film & foil.

samoloko · 19th March 2010, 04:19 PM

the question Is how many we need
If 0,1 uF Is good then mkp1837 Is best

qusp · 19th March 2010, 04:23 PM

indeed salas, but no-one ever believes me when I say this, so much so that I have given up trying. so many people seem to think that BG is magic electro and is even better for bypassing than films, even in digital circuits in dacs and power supply bypassing in digital circuits, BG is good anywhere it seems and they defy the rules of physics. IMO mundorf M-lytic are better than blackgate anyway if you must have an electro. but super E will take all comers so i'm told hehe

I much prefer evox/rifa or wima PET/PPS to vishay MKP, but vishay are also good

Salas · 19th March 2010, 04:35 PM

Quote:

Originally Posted by samoloko

the question Is how many we need
If 0,1 uF Is good then mkp1837 Is best

Wima 0.22 uF proved OK in the tests. That was the lowest. Try just one or two 1837s in parallel and see for yourself. Nobody has used 1837 there yet so to tell.

woodturner-fran · 20th March 2010, 01:20 AM

I'm busy at work photographing my build of the dcb1 - ill post full details in a day or so. I've also decided to send it out to a reviewer for a proper hifi type review. I think this would be most useful down the line a bit for those trying to decide what preamp to build. Just look at how many of us have looked at the f5 review on 6moons....

So more in a day or so.....

Salas · 20th March 2010, 01:26 AM

Is that for the site in your sigline?

windowman99 · 20th March 2010, 01:47 AM

I just checked my Voltages at the R1 p.s. locations. The plus supply is exactly at 2.0 V. However, the minus is slightly out of spec at 2.55 V. It's only 0.25V off and I'm wondering if it's anything to really worry about. DC offset is under 5mV and supplies are +10.7, -10, so everything else looks good.
Should I be concerned?

woodturner-fran · 20th March 2010, 01:54 AM

Quote:

Originally Posted by Salas

Is that for the site in your sigline?

Yes, indeed it is. Myself and few buddies put the site together for fun so we are only in the early days yet... be gentle with us!! (The story behind it is that we had a local forum hosted by a hifi retailer who fairly unceremoniously dumped the forum with no warning, so we decided to go independent with the forum and the review site followed on from that)

The idea is that we will review both equipment and music - maybe host a few podcasts etc etc.

One of my ideas is that I would like to send out some of the DIY designs we see here for a review by a non-DIYer, but someone who is an experienced listener. That way we can get a pretty unbiased review of the trus sonic worth of some of the designs available here. Very often I see reports here (and elsewhere - classic place for this is headfi!) of "oh wow this XXX amp sounds sooooo gooood" then read on to see "I can't believe how good my 128kbps files sound through this thing". I would like to aim these things a bit higher, reviewed against a better benchmark. For example if you read the review of the BlacksheepKables speaker cable, the reviewer uses Wadia, Kharma, Kubala Sosna etc etc etc. Now you and I might think that such equipment is hyped beyond its value, but it does generally serve as an excellent benchmark.

Despite all the hocus-pocus bullsh!t written over at 6moons, I found the review of the F5 useful when trying to decide whether to build it or not.

Anyway, thats my idea and this DCB1 will be a kind of test bed for it.

I'd be interested to hear your thoughts, but don't want to go to OT in this thread....

Fran

Salas · 20th March 2010, 02:07 AM

Quote:

Originally Posted by windowman99

I just checked my Voltages at the R1 p.s. locations. The plus supply is exactly at 2.0 V. However, the minus is slightly out of spec at 2.55 V. It's only 0.25V off and I'm wondering if it's anything to really worry about. DC offset is under 5mV and supplies are +10.7, -10, so everything else looks good.
Should I be concerned?

No, everything is OK. Those differences are due to semis. Let us know more when you will put it to the listen. Is it normal or hot rod?

20th March 2010, 01:20 AM	#1156
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	I'm busy at work photographing my build of the dcb1 - ill post full details in a day or so. I've also decided to send it out to a reviewer for a proper hifi type review. I think this would be most useful down the line a bit for those trying to decide what preamp to build. Just look at how many of us have looked at the f5 review on 6moons.... So more in a day or so..... __________________ Visit www.tirnahifi.org!!

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19th March 2010, 02:01 PM	#1151
sutantoroy diyAudio Member Join Date: Dec 2008	What is that mean? BG N better or MKP better? I think an elco is an elco, distortion always appear, am I wrong?

19th March 2010, 03:42 PM	#1152
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Where you don't need the many uF and the space is OK to fit, a film is inherently better. Especially film & foil.

19th March 2010, 04:19 PM	#1153
samoloko diyAudio Member Join Date: Jun 2006	the question Is how many we need If 0,1 uF Is good then mkp1837 Is best

19th March 2010, 04:23 PM	#1154
qusp Sometimes a square peg fits a round hole just fine diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	indeed salas, but no-one ever believes me when I say this, so much so that I have given up trying. so many people seem to think that BG is magic electro and is even better for bypassing than films, even in digital circuits in dacs and power supply bypassing in digital circuits, BG is good anywhere it seems and they defy the rules of physics. IMO mundorf M-lytic are better than blackgate anyway if you must have an electro. but super E will take all comers so i'm told hehe I much prefer evox/rifa or wima PET/PPS to vishay MKP, but vishay are also good

20th March 2010, 01:26 AM	#1157
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Is that for the site in your sigline?

20th March 2010, 01:47 AM	#1158
windowman99 diyAudio Member Join Date: Jan 2008	I just checked my Voltages at the R1 p.s. locations. The plus supply is exactly at 2.0 V. However, the minus is slightly out of spec at 2.55 V. It's only 0.25V off and I'm wondering if it's anything to really worry about. DC offset is under 5mV and supplies are +10.7, -10, so everything else looks good. Should I be concerned?

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