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Old 6th January 2013, 10:03 AM   #271
tinitus is offline tinitus  Europe
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Originally Posted by Lazy Cat View Post
I'll definetely do it this way....
so be it
should I build this, it would be exactly like you will have tested and approved, eventually
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Old 6th January 2013, 10:05 AM   #272
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Quote:
Originally Posted by pergo View Post
you can use a simple CCS. CRDs are integrated jfet CCS.
I know, but still fet based CCS needs much more than 0,8 V to be in a linear current range. Since CRD is integrated j-fet CCS, there's not much difference in behaviour between the two.
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Old 6th January 2013, 03:33 PM   #273
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VSSA with CCS (instead 15 k resistors) to inject bias current to the input stage:
1.pic - 50 kHz squares, 20,1 Vrms/8 ohm, 2,5 Arms
2.pic - the same, only 0,22 uF parallel to 8 ohm load
3.pic & 4.pic - driving 4 ohm speaker with music signal

CCS improvement is noticed. Ringing with 0,22 uF capacitor parallel to load is a little bit smaller and clipping is now fully symmetrical with no artefacts whatsoever, simply cutted-limited with rails.
Attached Images
File Type: jpg VSSA_Square3_CCS.jpg (572.0 KB, 778 views)
File Type: jpg VSSA_Square4_CCS.jpg (511.7 KB, 667 views)
File Type: jpg Proto9.jpg (592.6 KB, 643 views)
File Type: jpg Proto10.jpg (547.8 KB, 596 views)
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Old 6th January 2013, 03:49 PM   #274
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VSSA with CCS:
- 100 kHz squares, 20,5 Vrms/8 ohm, 2,5 Arms

I think it is time to design VSSA PCB.
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File Type: jpg VSSA_Square5_CCS.jpg (437.8 KB, 572 views)
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Last edited by Lazy Cat; 6th January 2013 at 03:54 PM.
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Old 6th January 2013, 04:03 PM   #275
pergo is offline pergo  Italy
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CCS current? 1.5mA?
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Old 6th January 2013, 04:12 PM   #276
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Quote:
Originally Posted by pergo View Post
CCS current? 1.5mA?
2,4 mA
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Old 6th January 2013, 04:22 PM   #277
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I asked the question in SSA thread, but got no answer. How do-you decide the current of each stages of an amp.
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Old 6th January 2013, 04:29 PM   #278
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Originally Posted by Esperado View Post
I asked the question in SSA thread, but got no answer. How do-you decide the current of each stages of an amp.
Sorry, I probably overlooked it. Well I always consider basic rule that vertical current has to be at least 10 to 20 times larger than full loading current. In VSSA input bias is 1,8 mA, VAS bias 15 mA and output will be 150 mA on proper heatsink. Now on the test copper heatsink it is set to 100 mA.

What do you think about loaded VSSA's squares response?
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Old 6th January 2013, 04:33 PM   #279
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so be it
should I build this, it would be exactly like you will have tested and approved, eventually
OK, deal.
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Old 6th January 2013, 04:35 PM   #280
pergo is offline pergo  Italy
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how better is THD with CCS? Reduced 3rd harmonic?
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