Any good TDA1541A DAC kit? - Page 128 - diyAudio
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Old 23rd July 2014, 01:47 PM   #1271
ryanj is offline ryanj  Australia
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Default DEM scope pics

Hey guys,

Just wanted to share a few shots I took with my new tek 2465a.

DEM with and without 6k8 resistors for stabilization.

Big difference.

Ryan
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Old 23rd July 2014, 01:52 PM   #1272
Eldam is offline Eldam  France
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@t Stajo and unknown tubes lovers :

If you have already some experience about an other tubes stage design, I believe simple PS design like said above are enough (even good for product version) to help us to do a part of a pre selection job as Andrea ask..

Try & trust you ears, then communicate : it is a wheel of goodwilled people, a little like a Demning wheel but in a cool perspective with sharing...and no judgemnts (look at my very low technical level...)

Andrea & Shane contribute a lot with tubes and other inputs & maybe need a little help for sharing tests... don't know, just guess !

Andrea opened a thread about tubes output but unlickily people came back here, like some others speak about wine or caps in another one : not a problem of course, but difficult to follow and split the work collaboration... all these alchoolics with wine and beers are terrible for audio !

But the informal way of this thread is of course something nice...it's DIY !

Last edited by Eldam; 23rd July 2014 at 01:57 PM.
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Old 23rd July 2014, 01:53 PM   #1273
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Quote:
Originally Posted by stajo View Post
Yes. How the amplification behaves. Is there any way to test this without a current source, meaning a 1541 as source? I think I have some somewhere but it would be nice to be able to send some squares and sinuses.
The problem is you have to send a current rather than a voltage. For example a sinusoidal current at 1 kHz swinging from 0 to - 4 mA.
One could use a BF245 as voltage controlled CCS, supplied from -5 V, and a function generator to modulate the gate, using first a resistor to set precisely the current swing.

If somebody has already build such that current DAC output emulator, please share your experience.

P.S. The Salas Shunt should be fine to supply the voltage controlled CCS.
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Old 23rd July 2014, 02:11 PM   #1274
stajo is online now stajo  Sweden
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Originally Posted by Eldam View Post
unknown tubes lovers
To get a real evaluation you would like people like Salas, DF96, ZenMod and SY here. PM them.

PS. SY is a wine nerd and probably one of the most tube knowing geeks you'lld find. In the ballpark of Morgan Jones.

Last edited by stajo; 23rd July 2014 at 02:36 PM.
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Old 23rd July 2014, 02:45 PM   #1275
Eldam is offline Eldam  France
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No I can't for many reason

- first i ha'm right now with Thorsten at phone, so no time (I joke of course !)
- I don't understand anything to tubes !
- Wow the list ! they are heavy fellows... this list let me shy !
- I tried already with some eavy knowledged ones for the Distinction coreboard and some of us had kindly participation...

But you can. from the first beginning I say it is collaborative !
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Old 23rd July 2014, 03:52 PM   #1276
stajo is online now stajo  Sweden
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But you can. !
Eventually. Getting drunk at a greek establishment atm.
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Old 25th July 2014, 12:37 PM   #1277
Eldam is offline Eldam  France
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It sounds like you are on holydays or more shy than I am !

If you are to visiting the Meteor aera in Greece, take care to the gouleyant white wine or buy a parachut !

Last edited by Eldam; 25th July 2014 at 01:07 PM.
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Old 25th July 2014, 01:23 PM   #1278
Eldam is offline Eldam  France
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Originally Posted by stajo View Post
Eventually. Getting drunk at a greek establishment atm.
At least, welcome to the wine&beers TDA1541 gang ! We surch donation an place to met each others at equal distance to have a barbecue !

With a rapid look at it could be in Seychelles...
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Old 11th August 2014, 11:23 AM   #1279
Luke is offline Luke  New Zealand
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Guys, I have been trying to understand DEM, and from what I can tell, I need a divider circuit for the clock. So if Im not mistaken, I take Bck and run it through the reclocker and apply it to pins 16 and 17. Is this correct?
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Old 12th August 2014, 04:56 PM   #1280
Eldam is offline Eldam  France
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Nowadays avoided by ECDESIGN himself for jitters issues...

Just use the two 6k8 resistor allowed on the Disctinction-1541 pcb... on s'est pris la nénéte pour ça ! (we choose the best trade offs to avoid those bad temptations...).

For checking by yourself it's better to beginn without the two résistors and try after to choose what you prefer !
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