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Old 24th April 2012, 08:21 PM   #251
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Quote:
Originally Posted by Idefixes View Post

It would be nice if you can detail your matching process for BIGBT driver (maybe with matching circuit diagram).

.............
(about pnp/npn input Bjt and Vas)
Sheet that was not in my mind, i just go to order more than the 10u of each note on my order...(on semi for input and fairchild for VAS), add 10?...20?...30?. I have in mind that it is quite difficult or need a udge batch of each to match NPN/PNP HFE.
I put 100unit of each on my bom list

Marc
Hi LC if you have a little bit time to answer, this two points must been for me clear before beginning. I want to etch two bord next week.
For moment i am working on casing architecture...will present you some sketchup later...I mear on finishing soft-start and speaker protection layout...

Marc
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Last edited by Idefixes; 24th April 2012 at 08:26 PM.
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Old 24th April 2012, 08:26 PM   #252
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No problem I have time

Will draw sch for IRF's

Last edited by Lazy Cat; 24th April 2012 at 08:28 PM.
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Old 24th April 2012, 08:30 PM   #253
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Originally Posted by Lazy Cat View Post
No problem I have time
Quite nice to you to help me....First at all : are the amout of npn/pnp, i put on my bom, realistic to achieve good matching?

Marc
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Old 24th April 2012, 08:46 PM   #254
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Soft start with 0-12Vdc on board power supply. Switching this can be achieve by on-off push button. It supplies the speaker protection and power led to. On board trafo avec 10Va 2x12Vac comme from industrial rubbish.

Board size : 190*70mm (a standart epoxy 200x150mm can produce two => one per block..
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File Type: jpg soft start_sch.jpg (99.9 KB, 438 views)
File Type: jpg soft start_brd.jpg (110.8 KB, 434 views)
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Last edited by Idefixes; 24th April 2012 at 08:49 PM.
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Old 24th April 2012, 08:47 PM   #255
sonnya is offline sonnya  Denmark
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Originally Posted by Lazy Cat View Post
Will you be present in Munich on High End Show?
No, i have some month work before it is done. Some of the features we work on is Zigbee remote with inductive charging. Both technologies works but it is more the mechanical work that takes time.

But i think the remote will wait as the remote mechanics will cost at least ~€20000.

-

Back to TSSA.

you have got it under good control this time Andrej. The removing of dc coupled gain has improved things a lot.
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Old 24th April 2012, 08:47 PM   #256
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Speaker protection that would drive the TLP627

Size board : 49*56mm
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File Type: jpg sp_prot_sch.jpg (69.9 KB, 419 views)
File Type: jpg sp_prot_brd.jpg (130.9 KB, 408 views)
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Last edited by Idefixes; 24th April 2012 at 08:51 PM.
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Old 24th April 2012, 08:48 PM   #257
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Quote:
Originally Posted by Idefixes View Post
Quite nice to you to help me....First at all : are the amout of npn/pnp, i put on my bom, realistic to achieve good matching?

Marc
Order BC550C 20 pcs, BC560C 20 pcs the same with KSA/KSC and you will find 2 matched pairs of BC550C/560C and 2 pairs of KSA1381/KSC3503, that is what you need for two monoblocks.

Measure them with hFE selecton of a regular multimeter. They measure with Ic=1 mA and that is OK, since there's no heating. Anyway you can notice hFE going higher just because touching them for a while. The point is to have all BJTs on the same surface few minutes before measurement and measure each the same amount of time, if possible not touching them.

All the same with output MJLs ...

Last edited by Lazy Cat; 24th April 2012 at 08:58 PM.
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Old 24th April 2012, 08:53 PM   #258
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Quote:
Originally Posted by Lazy Cat View Post
No problem I have time

Will draw sch for IRF's
For input i have little Jiig i done for BC546/556 selection for Nmos 200.

Marc
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File Type: png small bjt matching.png (8.4 KB, 392 views)
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Last edited by Idefixes; 24th April 2012 at 08:59 PM.
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Old 24th April 2012, 08:55 PM   #259
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Quote:
Originally Posted by Lazy Cat View Post
Order BC550C 20 pcs, BC560C 20 pcs the same with KSA/KSC and you will find 2 matched pairs of BC550C/560C and 2 pairs of KSA1381/KSC3503, that is what you need for two monoblocks.
OK Noted, may double the number....for supporting or another use.....

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Old 24th April 2012, 09:15 PM   #260
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Originally Posted by Smiley 09 View Post
I attach the guessed bal. IP for the TSSA. Your sharp eye suggestion & comment would be much appreciated.
Thnx for the answ.



Hi Smiley!
As far as I can see, you will have no signal at the output. It is shunted to ground by C3 to C6 and C8 to C12.
Thorsten
PS. Isn´t there a Beach Boys album called "Smile Smiley"?

Last edited by thorstenlarsen; 24th April 2012 at 09:21 PM. Reason: added caps (C8 to C12)
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