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Grounded Grid Preamp

Posted 7th July 2011 at 12:43 AM by alexcp (My DIY projects)
Updated 16th March 2013 at 02:35 PM by alexcp

Built from the kit from Bruce Rozenblit. Very nice one, but is not being used - it has too much gain for any of my systems. I will probably sell it.
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Old

New mobile phone

Posted 6th July 2011 at 05:50 AM by abraxalito
Updated 8th September 2011 at 03:08 AM by abraxalito

My trusty HTC Touch Pro2 kept dialling my last caller last week without my permission so I decided it was overdue for retirement. Can't say as I've ever really bonded with this phone - mainly due to the pants Windows Mobile 6.1.

Last Sunday I went into the Meizu shop and snapped up their M9 to replace it with. This is the first phone (out of 8 I think) I have bought based primarily on the OS (Android) rather than the hardware. That's evidence for the disruptive marketing behaviour of Google in the mobile space. Android wasn't quite available when I upgraded to the HTC around 2 years ago. Now they're claiming around 0.5million activations each day.

One interesting facility in the network menu settings is:

3G networks - turn off to save battery life and stabilize signal

I'd heard that running 3G soaked up juice but this 'stabilize signal' is a first on me. Its quite something when a new technology has the facility to disable it...
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Old

recapping Linn Linto

Posted 1st July 2011 at 01:28 PM by Donuk

Hi
I used to be an elecrical engineer years ago. Now I am retired and a bit rusty. My Linto is an early one, so it is well over ten years old. Can somebody tell me:
1) Would there be sonic advantages in replacing the electrolytic capacitors?
2) What affordable make of capacitor would be best - also which would not significantly change the overall tone of the unit?
3) There are a lot of capacitors inside. If I should change only some, which ones to go for.
Thanks
Don
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Old

The cloud of unknowing

Posted 30th June 2011 at 11:48 AM by abraxalito
Updated 8th September 2011 at 03:09 AM by abraxalito

Is the cloud disruptive?

Here's a cloud website that I consider to have tremendous disruptive potential as technology:

Datasheet Zone & DrawSCH : One stop to find datasheet,IC pinouts and application circuits & Draw schematics online for free!!!

Its potential for being disruptive innovation is so far untapped because I can discern no marketing strategy as yet. I've written to the founder and suggested having a dialogue about all the possibilities presented here. If I get a response, then I'll write more in a later post.
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Old

When all you have is a hammer...

Posted 28th June 2011 at 06:36 AM by abraxalito
Updated 8th September 2011 at 03:10 AM by abraxalito

... as the saying goes, everything starts to look like a nail. That's what's happened to me now I've started to look at business through the eyes of disruptive innovation. Its all around, everywhere I look I'm seeing signs of what I call 'disruptive stress'. Perhaps just 'disstress' would be the right term for it - businesses are disstressed.

Nokia is one big business, but its quite clear they are disstressed, big-time. Their 'cooperation' with Microsoft can only lead to one thing - being embraced and swallowed whole and digested as Boa Constrictors are wont to do. Wikipedia says of the Boa :

The size of the prey item will increase as they get older and larger.

OK Nokia's not of great interest to audio guys, so how about one a little closer to home? This morning in my inbox I received the regular missive from EETimes, replete with the latest gossip from the semiconductors world. Topping the bill - Freescale, with its monstrous debt pile. They...
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Old

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

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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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