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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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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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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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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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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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The F-word - or, why there is no such thing as too much feedback

Posted 8th September 2011 at 02:55 PM by jan.didden
Updated 8th September 2011 at 02:59 PM by jan.didden

Well, I did already a blog on feedback, it's uses, misuses and misconceptions. But there is someone who can explain it much better than I can, someone who has proven that he really understands what's going on in a feedback amplifier. Someone who knows what the terms 'fast amplifier' and 'slow amplifier' really mean (and what not). Enter Bruno Putzeys, who wrote the article with the subject name in my bookzine Linear Audio, Volume 1. I feel that this is such an important matter for audio that I decided to place it online for free download. You'll find it at Linear Audio | your tech audio resource under the tab Online resources.
Enjoy the ride, and do let me know what you think about these issues.

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Sapphire Desktop Headphone Amplifier Kit

Posted 8th September 2011 at 05:26 AM by rjm
Updated 10th December 2011 at 01:23 PM by rjm (add some photos)

Update: kits were sold, but another run of boards is going ahead!

There will be 10 kits available, at a cost of $100 each. The boards (rev. 14a1) and all parts for the boards will be included. Shipping is included.

Info here and here.
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Highly evolved converters - the next generation

Posted 8th September 2011 at 03:47 AM by abraxalito

Its been over a year since I blogged about DACs, so, long overdue, here's an update. I've abandoned my considerable development on the AD1955 because I found something that's more interesting - multibit. In the first instance - NOS.

A while back I bought a TDA1543 NOS DAC to play with, just to see what all the fuss was about with NOS. Plenty of people have waxed lyrical about the sound. At first listen, I wasn't impressed although it had a certain tonal richness in portraying orchestral instruments that was alluring. Bottom line - its soundstage was compressed front to back. This made it sound a little 'forward' - foreground instruments and voices were more highlighted compared to acoustic spaces ('background').

A second aspect which plagues pretty much all NOS DACs is their frequency response can hardly be termed 'accurate' - owing to the sinc function of first-order hold, they exhibit a significant HF roll-off which begins around 5kHz and reaches 3.2dB...
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LME49810 300 W amp kit from TaoBao (Test)

Posted 5th September 2011 at 10:17 PM by panson_hk

The board is ready for test. The bias level is adjusted via monitoring the THD level as well as the distortion residual.

THD vs power for 20 Hz, 1 k and 20 k for 8 Ohm are shown in the figure. It is so high compared to all my 498xx amps. For 1 k, we should have THD lower than 0.0008 %.

Let test the THD vs power without load. Without load connected, output stage contributes very little distortion. This can be used to check whether the 49810 functions as spec or not.
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LME49810 300 W amp kit from TaoBao (Cont.)

Posted 5th September 2011 at 12:10 PM by panson_hk

The amp is assembled and ready for testing. It is designed to have two rails: one for LME49810 (suggested +/- 60 V) and one for driver/output (suggested for +/- 45V). The speaker protector uPC1237 also has an input for detecting the presence of AC (half-wave rectified).

In my initial test, one rails supply to 49810 and the output stage. The positive is also connected to the AC input of upC1237.
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