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Project Dilemas

Posted 19th February 2010 at 05:41 PM by kevinkr
Updated 19th February 2010 at 05:50 PM by kevinkr

Isn't it odd how sometimes the things you intend to do first end up being the last things you actually get done? Or am I the only one with this problem??

I always have a few projects on the back burner, and few that are supposed to high priority and sometimes one or two that just appear because of an unforseen opportunity or a seemingly good idea.

In order of supposed priority I have been working on a new GM70 based SE amp design, an acrylic plinth TT, a pair of Half Chili Changs, and quite unexpectedly an FFT based audio measurement set up.

The turntable and the GM70 are more or less stalled. I need to purchase a mini-lathe, and a good metal cutting blade.

On the GM70 despite designing a choke coupled driver stage that really performs well I am still waffling over whether I want to use IT coupling instead. And the kicker is I need the above tools to fabricate the chassis for these amplifiers which ultimately will be 4 chassis...
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Past and Present Reflections

Posted 17th February 2010 at 01:17 PM by smoketest

[originally written in May 2009]

Hello, my name is Brian and Im a user. A Magnepan user. I, like perhaps many of you, have a mixed relationship with my Maggies. This is, in a way, a sad story of more than 20 years of listening dissatisfaction. At least until recently, but before we discuss that please indulge me the time to bore you with some history.

Consider your roaring twenties, or at least consider mine. In the early 1980s I was fortunate enough to bag a full set of precut particle board for a pair of Speakerlab K-Horn woofers. I added a 15 inch woofer, a full width Altec horn mid-range, a Heil tweeter, a home brew cross-over network and our little 2 bedroom house in West Palm Beach truly did roar. In fact our poor neighbor across the street had to walk over and ask us to turn it down a couple of times. With a borrowed Audio Research D-75A and a home made tube only pre-amp, it sounded like a rock concert.

After moving those behemoth speakers...
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Old
Rating: 4 votes, 5.00 average.

PSU for High end audio without electrolytic capacitors

Posted 13th February 2010 at 06:18 PM by Nazar_lv (Creative High end audio)
Updated 1st April 2014 at 10:45 PM by Nazar_lv

From article http://s-audio.systems/diy/psu-without-electrolytic-eng
----------------------------------------------

Electrolytic capacitors are constant part of power supply of audio devices, but in terms of sound he does not bring anything good, dispersion of sound quality-type of electrolytic capacitor is very large. Sonically the best types of electrolytic caps are Nichicon KZ, FG, Panasonic Pureism, Black Gate FK, NX, Elna Cerafine, Silmic II, Silmic,but the attempt to eliminate from PSU electrolytic capacitors was very successful, instead is used "electronic capacitor" (right side of the circuit).
It is global negative feedback free electronic substitutes, that has a low and stable impedance 0,1...0,2Ohm (equivalent to cap 40000u) in the band to megahertz shunting NP0 0,1 microfarads Murata GRM31 in close to chips, it completely detach regulator (317\337) from load, therefore we have the ideal transient response when load "changes",...
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Old

My F4 Guide

Posted 11th February 2010 at 06:36 AM by cviller
Updated 2nd November 2012 at 09:11 AM by cviller

This is a guide to building a F4 using my boards, but you may be able to find some useful information here even if you use other boards.

The boards are based on the schematics from Nelson Pass's FirstWatt F4. You can get the service/user manual here: First Watt: Products: F4

You might want to check out the GB thread here: http://www.diyaudio.com/forums/group...gb-f4-pcb.html

PCB
Here is a picture of the pcb.
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Errata
There is a trace error around R22. I have cut the traces on most of the boards I have sent - and the rest of the batch will be cut before I send them out.

These are the cuts which needs to be made:
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And the green lines indicate where a connection must be made:
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This can be done simply by having the leg of R22 go through the hole and to the side.

Schematics...
Attached Files
File Type: pdf F4R0.pdf (87.7 KB, 1415 views)
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Free pcb's from me

Posted 10th February 2010 at 08:34 PM by peranders
Updated 22nd October 2011 at 01:36 PM by peranders

diyaudio.com is a good place and this is my effort to raise money for the service.

I'm offering 4 pcs. of totally free pcb's of my diamond buffer SSB01 to all donating diyaudio members will get this without any charge.

Contact me via email from diyaudio (this is important) since then I can easily see that your are a member and I can also check if you have donated. Don't forget to write down your address also. Please write it so I can cut it out and put on the envelope.

Please notice that the pcb's requires two small patches (wires) and the version of the pcb is revision 0, red pcb's.

Schematics, pcb layout
BOM


The 25 first gets 4 pcs. of my SSB01 for free, even the shipping
1 Luke, shipped 2010-02-12
2 Boilermakerfan, shipped 2010-02-12
3 tcpoint, shipped 2010-02-12
4 khaho, shipped 2010-02-12
5 HiljaisuudenMeri, shipped 2010-02-12
6 Ed LaFontaine, shipped...
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Why are grown up people mean?

Posted 10th February 2010 at 02:58 PM by peranders
Updated 11th February 2010 at 04:13 PM by peranders

I'm sure you'll know about a forum where they call this forum "The Pub"? From time to time I read this forum and for those who don't know, the forum founders were a bunch of banned people from this forum. Some of them are rather decent but a few individuals must cry out their contempt. Why does it have to be that way?

Example:
Mr X says this about my forum:
Quote:
I know some other guy, from Sweden, who has several sockpuppets in his own forum.
He asks the questions about his own products and answers them.
Now beat this.
The forum software doesn't reveal a thing of the user identity such as IP numbers. I have clearly stated that the forum is mainly for support and you can also see that many of the users use the same nick as in other forums. Mr. X isn't a moderator at my forum, therefore he can't see IP numbers, not even a clue what they might be.

Mr. X is a grown up person which I'll believe has a working social life....
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Old

Power supplies for B1

Posted 9th February 2010 at 08:51 PM by DougL
Updated 28th April 2010 at 07:44 PM by DougL

My brother gave me a Pass B1 board.
Now that he has his working I thought I would look at mine.

I am going to use this space to record all of the links and tricks. Some of the links will be very basic.

http://www.national.com/ds/LM/LM317.pdf

http://optimus.meleeisland.net/downl...s/mc78xxct.pdf

http://www.quasarelectronics.com/kit...c-kit/3060.pdf


http://www.tubecad.com/2007/06/blog0109.htm

http://www.tubecad.com/2007/07/blog0113.htm

http://www.tubecad.com/2008/11/blog0151.htm

http://www.wenzel.com/documents/finesse.html

http://www.borbelyaudio.com/psshunt.asp
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Old

Some progress

Posted 4th February 2010 at 08:15 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)

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Old

LM1876 power amplifier

Posted 4th February 2010 at 12:09 AM by JozzaG

hi,
im new to this amp building thind and im having difficulty.
ive bought a few parts and im just having difficulty with the power supply, ive got a 240V 50Hz input to 24V AC max 3A output transformer, however it has only 2 leads and is not centre tapped like i orignally planned or was told. its model is the M2158L transformer and i was looking for some help on how to wire it up and use it in my amplifier.
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Old
Rating: 4 votes, 4.75 average.

GB F5 Guide (pcb version 2)

Posted 3rd February 2010 at 02:17 AM by cviller
Updated 14th February 2013 at 08:14 PM by cviller

As promised, I would make a guide to the boards and in particular to the additions I have made to the F5. I decided to do this in the blog, because then you can give me comments which I can use for improving the doc. However I'm not done at all, but I thought it would be nice to give you access to the BOM I have made.

IMPORTANT: Before you start stuffing your boards, you must read the manual/article written by Nelson Pass available for download on the First Watt website (First Watt: Products: F5).

Detailed guide by Steve and Matt: http://www.diyaudio.com/forums/pass-...mentation.html

PCB
Here is a picture of the pcb.
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There are no more boards available, but you can order F5 boards on the diyAudio store.


Schematics
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Optionality
With the addition of optional extra output mosfets and cascoding, there are...
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Attached Files
File Type: pdf bom.pdf (50.9 KB, 5041 views)
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