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Old 29th December 2012, 06:23 PM   #201
pergo is offline pergo  Italy
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i don't like fuses after capacitors.
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Old 29th December 2012, 09:44 PM   #202
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Quote:
Originally Posted by alex mm View Post
...... new PCB rev2.0 , I can't stay to do nothing
Happy New Year !
Alex.
Thanks Alex, you're true DIY

Happy New Year and many successful project for you too.

P.S. ALF08N16(20)V & ALF08P16(20)V perfectly fits to this PCB too.

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Old 29th December 2012, 09:47 PM   #203
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Quote:
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i don't like fuses after capacitors.
There are more capacitors after fuses.

Besides these are Time Lag fuses with better conductive characteristics than Fast ones.
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Old 29th December 2012, 09:48 PM   #204
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Quote:
Originally Posted by MiiB View Post
Alex.. nice.. but how to trim offset..??
Trimmers first, than measure, resistors in final.
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Old 29th December 2012, 09:50 PM   #205
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i was referring at Alex's pcb, where the output mosfets are connected directly with the fuses

It has Vrail --> caps --> fuse --> mosfet

Typical super-SQ-guru ( ) wants:
Vrail --> fuse --> caps --> mosfet
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Old 29th December 2012, 10:01 PM   #206
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Today I did listen to VSSA one channel and I have to say it has a potential.

Because I have installed VAS transistors on the main heatsink I had to use ref zener as bias spreader and it works, 100 mA bias for the outputs is completely stable. VAS bias goes from 10 mA (cold start) to 15 mA working conditions and stayed stable also on small heatsink as it is.

Measured output impedance and it is negative: at 4 Vrms unloaded I got 4,05 Vrms loaded with 4 ohm resistor.
Tomorrow I'll do it again, probably the positive probe was too close to sources pin of the output mosfets and I measured also voltage drop on that lead.

Otherwise it worked fluently.
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Old 29th December 2012, 10:02 PM   #207
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Quote:
Originally Posted by pergo View Post
i was referring at Alex's pcb, where the output mosfets are connected directly with the fuses

It has Vrail --> caps --> fuse --> mosfet

Typical super-SQ-guru ( ) wants:
Vrail --> fuse --> caps --> mosfet
There are 1 uF capacitors after fuses on Alex's PCB 2.0
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Old 29th December 2012, 10:15 PM   #208
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with a little mod you can easy have 1101uF
Only a picky advice
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Last edited by pergo; 29th December 2012 at 10:18 PM.
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Old 29th December 2012, 10:26 PM   #209
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Quote:
Originally Posted by pergo View Post
with a little mod you can easy have 1101uF
Only a picky advice
You mean like in schs from my signature's links?

But I didn't want to put more than 1 uF after fuses here in VSSA, made on purpose this way. You don't know why?
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Old 30th December 2012, 08:34 AM   #210
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are you afraid of the energy stored in the caps in case of shorts?
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