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Feedback, or how to be late and be on time the same time, all the time.

Posted 3rd November 2010 at 05:19 AM by jan.didden
Updated 3rd November 2010 at 10:20 AM by jan.didden

Just a couple of days ago I posted something to try to debunk that tired old myth that 'feedback always comes too late and therefor can't work'. Apart from the fact that obviously it does work, which makes the first statement pretty stupid to begin with, here's my take on it.

The myth may result from an often repeated misconception that feedback comes 'after the fact' and therefore always comes too late.
This has been shown to not be the case over and over again but if you have no engineering background it may be difficult to grasp the concept. Let me try to help.

Obviously, there is a signal delay in an amp from input to output and back to the input through the feedback loop. Since the feedback loop is generally a pair of resistors, the bulk of the delay is in the amp. That is the case both in non-feedback as well as in feedback amps. Such delays are very small, often fractions of a microsecond, and in this context can be ignored.

What...
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meridian 506 laser problem

Posted 28th October 2010 at 11:10 AM by meridianqq

I have concluded that I need to replace the cdm12.4 in my meridian 506. Has anyone got picture or instructions on how to go about taking it all apart?
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The Luxury of Stereo

Posted 20th October 2010 at 03:47 AM by ra7

Having moved to a new place over the last two weeks, I was looking forward to the day when I could set up my main system again. And today is the day.

There are still a few boxes left in the garage, both his and hers. The 'hers-too' factor means that it is no longer fine to have a dozen drivers lying around the living room, ready to be swapped in to the OBs any time. But this is a different challenge. An opportunity to work harder towards a single design, tinker less and enjoy the well-designed system more.

Yesterday, I added wings on the back, about 1 foot deep and 15" high, enough to provide a little boost for the Eminence Alpha 15s. The wings also help the baffles stand up. Today, I finally got the drivers into baffles, the B4 set up for the ANs, and all the connections made.

Sat down for a listen, turned it on... and ahhhh...... floated away. What a luxury it is listening to good stereo!
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Salas low shunt for DAC,Clock, Pre Phono

Posted 18th October 2010 at 08:43 AM by quanghao

Salas low shunt for DAC,Clock, Pre Phono
Out 1.5 to 5V
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Help to Modify Profire 2626

Posted 18th October 2010 at 05:13 AM by hawg4life

I wont modify my Profire 2626 interface but don't know where to find my ad converter plus in and out put op amps which capacitors do I change for a better sound and what types can I put in it, could I use film capacitors please can someone help. The caps say Suncap 100uf 25v and some 35 volts whats the best I can use I would love to use film caps if possible or the best electro brands. The power supply is on the board by its' self in the top right corner and the master volume is in the bottom right under the green panel. Can anyone tell me what to look for or how tho modify this board for smoothest sound. Thanks!!!
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Squeezebox SB3 update 2

Posted 15th October 2010 at 08:56 AM by audi0

I got the last capacitor for the analogue stage upgrade in the mail today, I had a couple of hours of spare time so made a start. DE-soldering of surface mount components has got to be the worst job! It's slow painstaking work avoiding damage to pads and tracks, and this took the longest part of the job. A slight modification to the IC adapter was necessary to avoid hitting a capacitor otherwise reassembly was simple.
Plugged it in and away it went (sometimes I surprise myself!)
Nice sound immediately and I'm sure its only going to get better once the Elna's burn in!
I was surprised how sturdy the adapter is, there was no issue plugging in the IC, so chip rolling would be extremely easy.
A worthwhile modification? Yes I think so!
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Great Snubber Article

Posted 13th October 2010 at 02:36 PM by DougL

http://www.diyaudio.com/forums/parts...ml#post2330818
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Squeezebox SB3 update 1

Posted 13th October 2010 at 08:43 AM by audi0

Squeezebox SB3 update 1

A little progress made, I have sourced and purchased some components;
a Brown Dog DIP8 to SO8 Adapter plus a LM4562 and some Silmic II caps, one more of them still to arrive, then I'll swap the parts.

I have done a board layout based on ideas gained from this diyaudio thread [url]http://www.diyaudio.com/forums/power-supplies/85662-squeezebox-power-supply-3.html[/url] and preliminary ideas for an enclosure have been drawn. So it's slowly coming together
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Allison Notes

Posted 10th October 2010 at 03:26 PM by klewis
Updated 13th January 2011 at 10:14 PM by klewis

Allison simulation threadhttp://www.diyaudio.com/forums/solid...ut-stages.html

JLH schematics http://www.tcaas.btinternet.co.uk/jlhupdate.htm
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Squeezebox SB3

Posted 10th October 2010 at 12:00 AM by audi0

After much deliberation I've decided to 'jump in' and modify my Squeezebox SB3.
I have read many threads on this and other sites gaining lots of ideas of what I want to try to achieve, basically as follows:

improved power supply, dump the wall wart and build a linear supply 5V @~ 3amps
improve the analogue section, initially trying different op amps and upgrading capacitors
remove the inductors from the digital out, add 75 coax and BNC connector (maybe add a transformer?)
upgrade to the 3.3V supply to the clock
build a new enclosure similar to a Peter Daniel amp, chunky aluminium back and front with timber sides (copying is the greatest form of flattery!)

I have made a start, opened it up and discarded the old plastic box. De-soldered the connection board and set aside, then soldered temporary wires for power L & R out and ground back to the connection board (temporary connection)

To get the board into...
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