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Fdnr

Posted 1st July 2010 at 11:28 PM by DougL
Updated 14th September 2010 at 07:34 PM by DougL

http://www.diyaudio.com/forums/parts...-resistor.html

Motorola used one on their first cell phone.

Chauser eleptical low pass with nulls at 4.5k and 9k iirc.

Now I am wondering if I could create a "passive line level" with this, avoiding inductors.

Here is a link to a design article:
http://electronicdesign.com/article/...sband6366.aspx
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Old

guide to the v1.2

Posted 22nd June 2010 at 03:47 PM by klewis
Updated 4th January 2012 at 12:13 AM by klewis

Reflektor Notes: http://www.diyaudio.com/forums/power...ml#post2724088 post 4287

B1 with Shunt http://www.diyaudio.com/forums/pass-labs/145201-building-symmetrical-psu-b1-buffer-2.html#post1854512

http://www.diyaudio.com/forums/power...ml#post2223856

schematics #1983 http://www.diyaudio.com/forums/power...ml#post2103465

Transformer R-Core EBAyhttp://www.ebay.com/itm/110V-50W-R-c...item4ab0dbf733

V1.2R schematics

http://www.diyaudio.com/forums/power...lator-320.html

board design starts 2384

Sense wire: Use RG58 on all your shunts for...
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Old

E-MU 0404 USB sound card mod thread

Posted 21st June 2010 at 03:56 PM by klewis
Updated 2nd January 2011 at 05:39 AM by klewis

http://www.diyaudio.com/forums/digit...ification.html

more on setting up sound card for measurementshttp://www.diyaudio.com/forums/solid...rements-9.html
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Old

Yet another DIY cable build approach.

Posted 19th June 2010 at 03:12 PM by aptquark
Updated 19th June 2010 at 11:15 PM by aptquark

Lets start by examining a few popular connectors available for the DIY enthusiast.

Here is one of Home Grown Audio's rhodium plated silver connectors. Very simple morphology. Some may find these "cheap" looking. Well...they are designed with simplicity in mind, and the cost is very reasonable. Acoustically, I really like the sound. High frequency extension is great, though with very resolving equipment, a tad to "bright". Still, a great buy. As far a durability goes, they are quite tough. But, with the stress testing that I do, after completing the cable, there is a tendency for the crimped-on negative portion to disassociate from the head. Keep in mind that I apply way more tension than would be encountered under normal operating circumstances. Overall, a very nice, inexpensive connector.

Next shown is the Audio Note RCA connector. This is a very well built RCA. Acoustically, a little more tamed in the upper frequencies compared to the HGA....
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Old

HEC part II

Posted 17th June 2010 at 06:07 AM by abraxalito
Updated 8th September 2011 at 04:04 AM by abraxalito

Here's a pic of the underside of the DAC before I started hacking tracks. Bottom left area is where the digital circuits are, with ground plane. Top left are the analogue output filters. Right is the caps, rectifiers and regs of the power supplies - digital at the bottom and analogue at the top.

The AD1955 sits about the centre of this pic, and if you look closely you'll notice two small holes I drilled in the groundplane either side of it where I will later install the 10uF decouplers.

The second pic shows the component side, prior to any hacks - the 'virgin board' if you like, although sullied by the two small holes near the DAC chip. The analog supply is pin15, that's at top left.

Third, here's the meat of the digital circuitry and I've already added one decoupler to the AVDD (analogue positive supply). To the right of the 24.576 XTAL (not required) is the DIR9001 SPDIF receiver. The DIL chip is a multiplexer allowing both USB and SPDIF input...
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Old
Rating: 3 votes, 5.00 average.

Don't be such a scientist!

Posted 15th June 2010 at 05:21 PM by jan.didden
Updated 15th June 2010 at 05:25 PM by jan.didden

I didn't get it. There are gifted design engineers on this forum. They get involved in threads. BUT, in most cases, eventually an 'issue' develops and the engineering guy gets binned or banned or asks to be banned. Why why why? Happened to me a few times. Not that I got banned, thank Ohm, but I got close to leaving because I too got enough of it.
Of what?
Let me explain. Most engineering types like to explain things, to tell others with less experience and knowledge what they are doing wrong and how they can do it better. They inundate you with facts, figures, links to engineering papers etc, and expect that the other guy flows over with gratitude. But, funny enough, it doesn't happen that way. The 'other guy' gets pissed off from being corrected all the time. Hell, he didn't come here for that, he came to have fun, discuss his hobby and his latest creation.

[flashback] At the time Al Gore's An inconvenient Truth came out, the same director (!) also made Too...
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Old
Rating: 3 votes, 5.00 average.

Salas HOT ROD DCB1

Posted 15th June 2010 at 04:56 PM by Tea-Bag
Updated 27th November 2014 at 04:51 PM by Tea-Bag (added BOM)

So I am going to write some details down about the DCB1 Hynotize Hot-Rod buffer. The current production board is black, 2 oz copper and 2mm thickness. (See below) The below blue pictures are prototype boards and are not representative of the product.

Here are some of the specifics to help understand ordering parts for it etc. This is not a detailed build guide, but there is a link to one below from another forum member.


Click the image to open in full size.

They can handle 10mm pitch snap-in capacitors 25mm width capacitors.

Click the image to open in full size.

There are positions for smaller MUR120 type diodes OR MUR820 style TO-220 style diodes. Not both!

The vRef LEDS can now be bypassed with a 25mm Film cap or a 100uf electrolytic. The film cap by consensus is best at .22uf.

Click the image to open in full size....
Attached Files
File Type: pdf Blue DCB1 v1.0.4.pdf (42.5 KB, 6736 views)
File Type: pdf SalasDCB1shuntreg build guide v4.1.pdf (50.7 KB, 6553 views)
File Type: pdf BOM DCB1 Oenboek.pdf (168.7 KB, 3022 views)
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Old

My project blog

Posted 14th June 2010 at 04:18 PM by taro2ss
Updated 14th June 2010 at 04:20 PM by taro2ss

Hello,

Click here is my project blog. There is some information about my headphone amplifier products.

Thank you.
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Old

Towards a better DAC - introducing the HEC

Posted 14th June 2010 at 05:16 AM by abraxalito
Updated 8th September 2011 at 04:05 AM by abraxalito

Doug Self's comprehensive work on power amplifiers has been an inspiration to me over a number of years. In it, he coined the notion of the 'blameless amp' as one which was beyond reproach, measurements-wise. So I pondered over running with the notion of 'blameless DAC' along the same lines. Initially this sounded attractive, even though not entirely original. Google found a reference to it already here on diyaudio but could not show me the actual posting.

I decided on reflection that the 'blameless DAC' would be not such a good idea. That's partly because for me, measurements are not the goal of audio design. Enjoyable sound is what does it for me, not vanishingly low THD figures. So a 'blameless DAC' could only be blameless if measurements are God, so to speak. For someone like me for whom auditory experience is all, I decided I'd need another term for my DAC project.

I've settled instead on the term 'highly evolved converter' or HEC for short. This recognises...
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Old

New scope...

Posted 2nd June 2010 at 05:59 AM by abraxalito
Updated 5th March 2012 at 03:52 AM by abraxalito

Click the image to open in full size.

Bought this (well not quite this one, mine has Chinese text on the panel) little puppy yesterday as my old UNI-T was just getting too frustrating to use. In particular its triggering ability is almost useless, giving way too much jitter. That added to the trig level encoder being majorly unreliable (its just over a year old) and lots of apparently self-induced noise on the trace meant I decided to bite the bullet. And boy I'm glad I did - its like getting a new pair of HD800s to replace my aged Sony CD3000s, everything is much clearer.... (and no, I haven't made that particular upgrade yet).

About six months ago I first noticed the younger sibling of this scope in a shop window in the local electronics market. I was blown away - a widescreen scope? That screen was drop dead gorgeous! This pic really doesn't do it justice so hopefully I'll post up one of my own pics soon.

Having been immediately...
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