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krell

Posted 6th December 2010 at 04:10 AM by ihaveKRELLparts

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Software

Posted 29th November 2010 at 08:36 PM by klewis
Updated 5th January 2011 at 11:25 PM by klewis

Pcb software

Sprint-Layout

Audio analysis software;

Virtins MI http://www.virtins.com/
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Opamps for dc servo

Posted 29th November 2010 at 03:57 PM by klewis

For servo duty, there are some newer TI offerings which look worthy. That is assuming that lowish noise and bias currents are desirable (they would be to me if I were seeking out a servo amp). OPAX141, OPAX376 and OPAX209. The latter is bipolar but has lower noise than any JFET I've seen coupled with commendably low input bias current for a bipolar.
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Squeezebox SB3 update 3

Posted 26th November 2010 at 10:54 AM by audi0

Hi guy's I haven't added to this blog for a couple of weeks as progress has been a little slow.

I have however had the front and back plates cnc milled and I have drilled and cut the connector holes in the back plate. The plates will now be cleaned up, acid etched and clear anodized.
The timber sides are cut and the threaded bushes are in, I still need to rabbet the top and bottom edges for the covers, but the enclosure is taking shape. I'm not sure about the perforated ally for a top? What do you guy's reckon?

A redesign has slowed the power supply board a little, I now have the board (thanks to Neville @ Sesame who etched and drilled it for me) all the components are ready to stuff, so the next blog will update how the power supply performs
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Teac TD-X250i Service Manual

Posted 25th November 2010 at 10:18 AM by Andrew Burn

Hello,
Please can anyone give information about where to obtain a service manual or schematic diagram for a Teac TD-X250i CD/iPod micro hifi. Information seems to be un-available as this model was apparently made solely for the Currys/Dixons retail chain.

Any help would be greatly appriciated.
Andrew G. Burn
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New scope - update

Posted 25th November 2010 at 02:36 AM by abraxalito

The Tekway is still working well and survived the 35oC temperatures of Hangzhou's summer despite having no internal fan. That is, apart from its CMOS store of the date/time, which for some reason now thinks the year is 2011.

Someone on the EEVBlog just posted this - I haven't read it thoroughly yet but I intend to find out if I can upgrade to 200MHz. Looks promising

Upgrading DST1102B to 200MHz bandwidth
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Old

JBL L100 Homage

Posted 20th November 2010 at 05:55 AM by DougL
Updated 11th February 2011 at 05:50 AM by DougL

I got into audio my freshman year of collage in 1973. While I hated the "West coast sound",
The JBL L100 looked great, and had a great woofer. It is also higher efficiency than most.
HTGuide did a Thread on redesigning the XO and made a very appealing speaker.
I looked up the woofer and its 88 db efficient. So much for perception of efficiency.

My thought was to design a 3 way speaker that is ultra low distortion, 50Hz F6, and 93db efficiency. Borrowing the L100 concept, Driver compliment 12" woofer, 4" mid-range and OS compression driver.

There are at least 3 drivers in the 4" class with 93db Audax HM100Z0 4" Aerogel Mid-range ,
Fostex FE126En 4" Full Range
I already have and love MP14RCY/P in ob, but they are only 90db sensitivity.

The B&C 3/4" or 1/2" CD look like they might be a perfect match. Sure beats a 2" paper tweeter.
Even a B&C...
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Keantoken C-multiplier

Posted 17th November 2010 at 03:45 PM by klewis
Updated 7th January 2011 at 02:00 AM by klewis

http://www.diyaudio.com/forums/power...lator-128.html

voltage multiplyer: Cockcroft-walton

http://members.tm.net/lapointe/cockcroft_walton.htm
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More transparency in active speakers - part II

Posted 15th November 2010 at 01:59 PM by abraxalito
Updated 5th March 2012 at 03:58 AM by abraxalito

Its not something I claim originality for, this use of Cat6 cable for running to speakers. What though I believe is original is combining the function of speaker cable with the sharing resistors - I've seen that nowhere else. Remember guys, you saw it here first

Not only does this save on having low value fairly high power resistors but it comes with another benefit which suits diyers. That's the fact that the amps can be easily tested separately - they're not going to be in parallel until the drive unit is connected to the output, since the cables join together only at the far end, at the terminals of the driver. I've certainly found this an advantage in development - the individual gains I've checked with a multimeter between the outputs when playing a 400Hz sinewave. This frequency was chosen because I'm too lazy to check the frequency response of my multimeter and I wanted a mid-range test.

The gains of the individual chip amps do need matching very...
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More transparency in active speakers

Posted 13th November 2010 at 04:23 AM by abraxalito
Updated 5th March 2012 at 04:05 AM by abraxalito

Those of you who read my earlier posts about improving my Fayou actives might have realised by now I'm a bit fanatical about grounding and its effect on sound quality. I had an idea - could a system be put together without any ground at all, and might this solve many of the sound quality issues I've found in my setup? I could only find out by trying it. So, the idea was born - 'Goundless Sound'.

First up, a groundless amplifier is just another name for a balanced, or bridged design, at least in respect of the output being balanced. A truly balanced amp would also need a balanced input - that's not really ground-breaking (pardon the pun, could not resist) either. Putting the two together is hardly rocket science. But I decided on a few twists - more about those in just a moment.

Convention is a useful thing. Ponder a world without convention in respect of computer keyboards - Asus and Toshiba having one layout of the keys on their notebooks, Dell and Lenovo...
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