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Rolling Your Own (an adventure in coil winding) part I

Posted 24th September 2011 at 12:46 AM by wintermute (Wintermutes Rantings)
Updated 6th February 2013 at 11:09 AM by wintermute (add info about where I got the magnet wire.)

Wind my own coils, yeah why not, how hard could it be? Well if you are as much a perfectionist as I can sometimes be, pretty damn hard!!!

I suspect it would actually have been a whole lot easier if I'd not obsessed about getting a low DCR for my coils, and gone with a smaller gauge wire. As it turns out I was (obsessive), and decided to use 1.6mm (~14 AWG) wire.

I originally had thoughts of measuring off the length I needed, clamping one end in a vice and slowly turning the former (in my hands) until I wound it all on, luckily that Idea didn't last very long and I started to think about making a winding jig.

I hit google and saw some pretty fancy jigs, motorised with clutches, speed control, turn counters, that all looked too hard, so I thought about what I actually needed. Georges Transformer winding jig was in the back of my mind too, which gave some inspiration as well

The pictures below are what I came up with. I had...
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Posted in misc, Speakers
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Old

LME49810 300 W amp kit from TaoBao (Mods)

Posted 23rd September 2011 at 07:19 AM by panson_hk

The THD performance of this board can be improved by separate the input/NFB ground from the decoupling grounds. This is a common mistake in many kits.

Simply cut the trace as shown in the figure and connect the input/NFB ground to supply ground via a separate wire. THD improves as shown in the figure.
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Old

Home Teather

Posted 20th September 2011 at 02:39 PM by Taskinen

Hi!

I have designed speakers of my own using Dayton Audio loudspeakers (tweeter Dayton Audio 1" Reference Shielded Tweeter, Midrange Dayton Audio 4" Reference Full Range Driver and last but not least, Bass Dayton Audio 8" Reference Shielded Woofer). The reason why I picked these speakers was, that these things are good looking and good combination.

I built the box of 19 mm MDF-wood, 120 mm tall (about 126 mm with spikes), 25 mm wide and 40 mm deep. Volume of the box is around 80 litres. Tweeter and mid has small area of the box and it's filled with lamb's wool. Woofer has over 70 litres of space to and there is 4" Aeroport reflexport in the bottom of the box. With this combination of wooferbox, I really had doubts wheather my choise of woofer had enough raw power to use the space.

I also designed Crossovers by myself, they turned out to be 3. order passive crossovers (100Hz/3000Hz). It was very hard to design, because I...
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Old

120 Volts Reciever using 220V active Subwoofer

Posted 19th September 2011 at 09:04 AM by rblinku2

Hi,
Could somebody help me, im getting OnkyoTx-NR609 from USA 120V. as my reciever and i decided to purchase the speaker here in the philippines using 220V. Should i expect a problem if i will use a 220V active subwoofer. (the Onkyo reciver will be using step down transformer 110V to be plugged into 220V outlet).

Tnx
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Old

Tube Rectifier Comparison with SSHV in between

Posted 16th September 2011 at 12:14 PM by dvb projekt
Updated 16th September 2011 at 04:38 PM by dvb projekt

Click the image to open in full size.
Vin= SSHV input / Vout= SSHV output


Because i am on vacation, i had the time to listen to two other tube rectifier i have.

The question, if there are still differences in sound with different tube rectifiers and the SSHV in between, is

YES !!!

Till now i used the Bendix 6101, a very nice sweet and soft sounding rectifier.

After i roll to the SED Winged "C" 5U3C (5U4-G) Black Plate rectifier,



...someone lift a invisible curtain...



Much more precision in the mids and highs and the soundstage open up in all directions.
Jesus, in comparison the Bendix sounds much to soft!

The Mullard GZ37/CV378 Coke Bottle has also the qualities of the 5UC3 Black Plate,
but is a bit softer sounding.

The only disadvantage
...
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Old

Salas Board Minikits and Full Kits

Posted 16th September 2011 at 01:37 AM by Tea-Bag
Updated 25th April 2015 at 09:16 PM by Tea-Bag (expanding for all kits)

Here I am going to post some semi-commercial information regarding the minikits.



BIB or SSLV1.1
Make sure to read the full BiB build manual before ordering parts. The link is posted below.
BIB BUILD GUIDE REV2 BY SALAS

It is essential you understand and purchase for the correct voltage type and range you need for this kit and additional parts.

The purpose here is to report what parts are included in the minikit, and which are not.
This will assist builders in getting the correct parts that are not included in the minikits.

The minikits are made for one of the three sections of the PCB. The board itself can hold two positive and one negative rail type supply.

The kits are purely optional, and are sold to assist the buyer who may not be able to access the resources needed to gather the specific parts.

There are four kit types described below. IRF for voltage 5.5v...
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Old

Crossover for Vifa Center speaker

Posted 14th September 2011 at 12:59 PM by John_wr

I no longer own this speaker. Unfortunately I don't have all details of component values or the polarity of driver connection.
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Old

First article about DEM (TDA1540, TDA1541)

Posted 9th September 2011 at 10:21 AM by Nazar_lv (Creative High end audio)
Updated 1st April 2014 at 09:49 PM by Nazar_lv

“Dynamic Element Matching for High-Accuracy Monolithic D/A Converters” RUDY J. VAN DE PLASSCHE. IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. SC-11, NO. 6, DECEMBER 1976
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Old

PCM58, the best 18bit parallel DAC

Posted 9th September 2011 at 10:14 AM by Nazar_lv (Creative High end audio)
Updated 1st April 2014 at 09:48 PM by Nazar_lv

Article from IEEE journal and datasheet about PCM58

AN 18-BIT DAC FOR CONSUMER APPLICATIONS” By F.J. Highton and K. Ito, 1988
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Old

MASH

Posted 9th September 2011 at 10:10 AM by Nazar_lv (Creative High end audio)
Updated 1st April 2014 at 09:48 PM by Nazar_lv

Articles and patents about SONY (NTT develop.) MASH DACs.

“A 17-bit Oversampling D-to-A Conversion Technology Using Multistage Noise Shaping” YASUYUKI MATSUYA, KUNIHARU UCHIMURA, ATSUSHI IWATA AND TAKAO KANEKO. IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 24, NO. 4, AUGUST 1989

US Patent 5,021,788
US Patent 5,073,778
US Patent 5,148,168
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