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About 6 watts

Posted 25th June 2011 at 03:38 PM by Pano

The other day I was wondering just how much power I really need for my rig. Can't be much as I run Altec A5s in a small room - but how much? Would a 10 Watt SE amp be enough?

So I set out to figure out how much power I need.

A few weeks back while doing some crossover work and measuring voltages I was surprised to find that my horns are running about 5mW of power - average. Uhhh, that's not much. OK, but what about the woofers? Here is how I proceeded:
  1. I found a few bass heavy tracks and played them as loud as I would ever care to.
  2. The average volume knob setting for these was noted.
  3. The tracks were opened in GoldWave and low pass filtered at 440Hz, same as the woofer section.
  4. The low passed tracks were analyzed in GoldWave for their RMS value. Average was -15.5dBFS RMS
  5. Using the function generator in GoldWave I made a 40-880Hz, 30 second sweep at -15.5dBFS.
  6. This sweep was played back several times at the same volume setting as before.
  7. Voltage
...
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Old

The historical roots of disruptive innovation

Posted 23rd June 2011 at 02:08 PM by abraxalito
Updated 8th September 2011 at 03:10 AM by abraxalito

I've been chasing back a little of the history of CMC's idea which I expounded on in the last post. There's nothing new under the sun of course so I'm sharing here some of the writing of Joseph A Schumpeter as I find it pretty inspiring.

I first learned about Schumpeter from reading a book on management compiled from the extensive writings of Peter F. Drucker ('The Essential Drucker'). In one chapter Drucker sounds very much like he's reading from his crystal ball and predicts that where Keynes' ideas ruled the 20th century in economics, it would be Schumpeter's theories that reached ascendancy in the 21st. Having read some of Schumpeter based on that recommendation I'd say that Drucker was indeed spot on.

Here's a short taste of what Schumpeter has to say -

The first thing to go is the traditional conception of the modus operandi of competition. Economists are at long last emerging from the stage in which price competition was all they
...
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Old

P2P LM3886TF V.2

Posted 22nd June 2011 at 07:31 AM by tigersilver

P2P LM3886TF V.2
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Old

P2P LM3886TF

Posted 22nd June 2011 at 07:28 AM by tigersilver

P2P LM3886TF
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Old

The complete DDNF I/V Output Stage

Posted 19th June 2011 at 02:14 PM by dvb projekt

Click the image to open in full size.


Transformer input voltage: 3* 24VAC
Shunt input voltages: 3* 32VDC
Shunt pot value: 3* 5k0
Heatsink Rth: 3,7 K/W or better



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Old

Disruptive technology or disruptive innovation - what's the difference?

Posted 19th June 2011 at 08:12 AM by abraxalito
Updated 8th September 2011 at 03:11 AM by abraxalito (Added link to CMC's own webpage)

This week Bruno Putzeys posted about his innovator's dilemma. You can read that post here:

http://www.diyaudio.com/forums/class...ml#post2608169

In brief he's designed and produced some disruptive technology (UcD, and now nCore) and can't quite see the way forward to turning that technology into disruptive innovation. Disruptive technology is not automatically disruptive innovation - it needs a suitable marketing strategy before its truly innovation. Bruno's using the traditional marketing plans for OEM amplifier modules and finding he's not making much headway.

'No one puts new wine into old wineskins, if it is the skins burst and the wine is spilled and the skins are destroyed; but new wine is put into fresh wineskins and so both are preserved'. - Matthew 9:17

Jesus might just as well have been lecturing at Harvard Business School here because this is precisely the message of Clayton Christensen's book...
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Old

Parafeed output amplifier circuits

Posted 17th June 2011 at 01:36 AM by tubem

Has anyone in the forum built a parafeed output amplifier, could you please tell me about your experience with it.Do they sound any better than a typical single ended design? Thanks tubem.
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Old

Companies don't seem to get it

Posted 15th June 2011 at 02:09 AM by abraxalito
Updated 8th September 2011 at 03:11 AM by abraxalito

YouTube - EEVblog #178 - Agilent U1272A Response

Now - out of all the companies Dave mentions, which one is toast? Hint - its a famous name in handheld test and measurement beginning with F and sounds like 'puke'.
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Old

An engineer's engineer passes on...

Posted 14th June 2011 at 02:35 AM by abraxalito
Updated 8th September 2011 at 03:13 AM by abraxalito

Analog guru Jim Williams dies after stroke - 2011-06-13 15:26:32 | EDN
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Old

Yesterday at the park...

Posted 13th June 2011 at 01:48 AM by abraxalito
Updated 8th September 2011 at 03:13 AM by abraxalito

I've been in China for over six years now and had a few ideas about opening my own business. Initially I was giving serious thought to opening a training school. Then after a stint at a travel company for a couple of months I had a great idea about a new kind of travel service. For both of these notions I got domain names registered but I subsequently got more interested in other things (not just women I hasten to add).

Well finally, I've found it. The business opportunity that I've been building up to all my life. I announced it at the public English Corner yesterday to a handful of people as I was curious to gauge their response. Overall, very positive and despite being a kind of business they'd not previously encountered they really seemed to get the message quite quickly.

This isn't strictly speaking a business in the traditional sense of being a company. Its more a network of interested and passionate individuals - cells in a super-organism if you...
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