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RJM Audio, now on Google+

Posted 21st November 2011 at 12:06 PM by rjm (RJM Audio Blog)

I hate facebook but I'm willing to give Google+ a go. Now they have "product" pages as well as "people" pages, I have made a little port to RJM Audio.

RJM Audio Google+ page
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The Von Neumann architecture is becoming the niche.

Posted 15th November 2011 at 03:50 AM by abraxalito
Updated 5th March 2012 at 03:51 AM by abraxalito

Its a single page review of ARM Techcon. At the end I think he means 'PC design' not 'PCB design' as he's written.

He says:

If Intel doesn’t do something soon this might not be much of a war.

He knows some guys at Intel read his analysis so I think he's sugaring the pill. Intel is rather like the hare in the old fable of the tortoise and the hare. The hare woke up and tried to catch up with the tortoise but it was too late. That's exactly where Intel is right now - they've become awake to the issue but they've missed the boat.
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Field Coil Wild Burro

Posted 11th November 2011 at 08:33 PM by DougL

I had hoped that this might happen some day.
I will be watching this
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a text

Posted 30th October 2011 at 09:09 PM by tomtt
Updated 29th January 2012 at 06:29 AM by tomtt

The perception of the higher order annoyance may be biological or cultural,
as not all musical instruments are made the same.

- a diyaudio forum member

My only advantage as a reporter is that i am so physically small,
so temperamentally unobtrusive,
and so neurotically inarticulate that people tend to forget that my presence runs counter to their
best interest

- joan didion

Click the image to open in full size.


i should be frustrated but i can't seem to stop thinking about beautiful things .

- john mayer


Click the image to open in full size.

''Closest thing to dying that I know of,''
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rolling your own (an adventure in coil winding) part II

Posted 28th October 2011 at 09:13 AM by wintermute (Wintermutes Rantings)

OK so I've been a bit slack getting to the second instalment. I actually finished the last coil about three weeks ago and have made the crossovers.

Tip number 1. Wear Gloves!! After the first coil my fingers were killing me. I'd pulled back the skin on my fingertips so hard that it was coming away from under the fingernails. Ouch!!! The gloves I subsequently wore were just normal rubber dish washing gloves. These worked quite well because they allowed me to put tension on the wire (holding the spool) and I no longer got sore fingers

Tip number 2. If you can make the same value with different size formers, choose the one with the lesser turns per layer. My pancake coils were much easier to make than the taller ones.

I think that the reason for tip 2 is that the more turns per layer, the more chance that small kinks in the winding wire will add up to enough to make it hard to get the last turn on for any particular layer. The coils...
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A man with cojones...

Posted 27th October 2011 at 09:33 AM by abraxalito
Updated 5th March 2012 at 03:49 AM by abraxalito

How often are you likely to read the words 'Jobs eventually relented' ? Read and weep Intel; Tony Fadell: respect.

Steve Jobs Wanted Intel Chips for the iPad - Digits - WSJ
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Super Regulator PCB's for free

Posted 22nd October 2011 at 01:14 PM by peranders
Updated 27th December 2011 at 05:31 PM by peranders is a good place and this is my effort to raise money for the service.

Click the image to open in full size.

I'm offering free pcb's of my Sjöström Super Regulator SSR01 to all donating diyaudio members. You will get this without any charge except for worldwide shipping 33 SEK (5 USD, 3,6 EUR)

Contact me via email from diyaudio (this is important) since then I can easily see that your are a member and I can also check if you have donated (the star in your profile). If you don't have donated yet, here is the link:
diyAudio - Donations

Shipping is paid via Paypal but you can also use credit card if you don't have an account at Paypal. I will also use the Paypal address as the shipping address if you don't say anything else.

Fine measurements by jackinnj Do you...
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ml cls one plytron transformer (75-1) or accoustat twin transformer mod

Posted 12th October 2011 at 06:21 AM by teslaboy

I collect esl speakers and mod some.
I have both ML CLS 1`s and cls 2Z speakers.
i would like to mod both speakers.
I would like to use my plytron 75-1 esl transformers
instead of the stock transformer.(CLS-1) should i
start from scratch or use the ML original eq with modifications. Also on the ML CLS2 i want to use
one original transformer for bass and a toroid for the highs like the acoustat MK 121 interface.
Should i use the same values as acoustat or use
other values. I value any ideas the community may
have, I have followed Calvin for many years and would like to thank him for his inspiration.
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What's in a datasheet?

Posted 7th October 2011 at 06:38 AM by abraxalito
Updated 14th November 2012 at 02:47 AM by abraxalito (Updated with link to new article 14th Nov 2012)

Yesterday I had this very interesting exchange with RocketScientist about his open source design for a headphone amp, the O2.

The nub of the issue raised here is - should designers stick only to what datasheets tell them about parts or to what extent use what's 'common knowledge' about parts to eek out better performance?

I was surprised to learn from RS that offsets within dual opamps are so closely matched in practice - its a really new discovery for me. So why don't semiconductor manufacturers tout this feature? Or perhaps RS just 'got lucky' with the relatively few samples he tested?

My experience of reading opamp datasheets is that the specs for offsets (both the typicals and the max) degrade in going from single to dual devices, where the devices are all on one die. Let's have a look at a relevant opamp from...
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Dahlquist LP1

Posted 5th October 2011 at 03:29 PM by soundalot

What op amps can replace the 4558 in the Dahlquist LP1 crossover?
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