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Link to my writeups, and other things...

Posted 19th July 2010 at 06:30 AM by wolf_teeth

Photobucket pages:
http://photobucket.com/Wolf-Speakers_and_more

My blog at PE:
http://techtalk.parts-express.com/blog.php?u=4102

This is not my main forum of visitation, so in case someone finds me here...
Wolf
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Active crossover network using 555 timer as class D amp

Posted 9th July 2010 at 08:17 AM by ledmania
Updated 13th July 2010 at 06:07 PM by ledmania

This blog may provide interest to some newbie looking for low cost, easy to build class d amp source tuned to their listening taste. I have already tried this circuit on the breadboard and it sounds surprisingly good but I’m sure it will work much better on PCB of course. The timer chip I used is the CMOS LMC555 because it’s a lot faster than bipolar counterpart such as 15 ns rise and fall times and can oscillate up to 3 MHz @ 5V. Of course you can use bipolar 555 timer as well.
About the circuit:
The circuit consist of 2 classical yet popular configurations; The master wired as “astable multibivrator” and the slave as “one shot” monostable.

http://geekcircuits.com/wp-content/u...ive-filter.png
Figure 1.
Slave A is an active band pass filter tuned to 20 Hz with +/-7 Hz bandwidth serving as “mega bass enhancer” while slave B is a simple high pass filter with -3db roll-off at 7 KHz for the treble. Slave C will fill-in...
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Fdnr

Posted 1st July 2010 at 10:28 PM by DougL
Updated 14th September 2010 at 06:34 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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guide to the v1.2

Posted 22nd June 2010 at 02:47 PM by klewis
Updated 3rd January 2012 at 11:13 PM 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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E-MU 0404 USB sound card mod thread

Posted 21st June 2010 at 02:56 PM by klewis
Updated 2nd January 2011 at 04:39 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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Yet another DIY cable build approach.

Posted 19th June 2010 at 02:12 PM by aptquark
Updated 19th June 2010 at 10:15 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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HEC part II

Posted 17th June 2010 at 05:07 AM by abraxalito
Updated 8th September 2011 at 03:04 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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Rating: 3 votes, 5.00 average.

Don't be such a scientist!

Posted 15th June 2010 at 04:21 PM by jan.didden
Updated 15th June 2010 at 04:25 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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Salas HOT ROD DCB1

Posted 15th June 2010 at 03:56 PM by Tea-Bag
Updated 2nd January 2014 at 05:30 PM by Tea-Bag (added BOM)

So I am going to write some details down about the DCB1 Blue Edition Buffer. This is the best I can tell, the third or fourth iteration of this buffer/Power supply. The GB will certainly represent the third run of the buffer.

Salas added some tweaks to the design which CRT implemented. I will be offering these boards for sale.

Click the image to open in full size.


Here are some things that make it different,
It's a larger board.
More room for filter caps.
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.

The vRef LEDS can now be bypassed with a 25mm Film cap or a 100uf electrolytic.

Click the image to open in full size....
Attached Files
File Type: pdf Blue DCB1 v1.0.4.pdf (42.5 KB, 5898 views)
File Type: pdf SalasDCB1shuntreg build guide v4.1.pdf (50.7 KB, 5454 views)
File Type: pdf BOM DCB1 Oenboek.pdf (168.7 KB, 2579 views)
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My project blog

Posted 14th June 2010 at 03:18 PM by taro2ss
Updated 14th June 2010 at 03:20 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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