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-   -   Swordfishy/ASPEN FETZILLA power amp (http://www.diyaudio.com/forums/aksa/191053-swordfishy-aspen-fetzilla-power-amp.html)

JKC 29th September 2011 12:29 AM

Woody,

You can wind this inductor on 5mm core. Just make sure that Rz resistor will fit inside. Have fun.

George

JKC 29th September 2011 12:35 AM

Hugh,

Have you tested different values of R10 degeneration resistor?

George

AKSA 29th September 2011 12:37 AM

No George, 47R it is.....

BTW, for winding the inductor, just choose a medium size philips head screwdriver. They make an EXCELLENT former, one you can remove, and leave behind a perfectly formed coil for mounting on the board.

Just remember, when winding, hold screwdriver handle in right hand, wire with left, secure the wire end 1" on the body of the screwdriver with right thumb, then start winding towards you from the top, and down, under, back up on other side, that is, CW viewed from the left hand end.

Always keep the wire hand (left) slightly to the right of the coils as you wind, so they pack closely. Otherwise, there will be large gaps between turns, which looks very untidy.

Hugh

Woody1911a1 29th September 2011 12:49 AM

TY :)

sandyhooker 29th September 2011 12:57 AM

Core dia
 
I believe 5mm will do. :)

spind 29th September 2011 01:51 AM

I'd be happy to get a pair of boards if there is a second go round.

thanks,
Steve.

col_s 29th September 2011 06:59 AM

I temporarily want to run my boards with 18VAC transformers , until I get some new transformers. In the construction guide it says to adjust "the voltage across the bootstrap resistor R12 to 24-26 volts (P3)". What should this be set to if I'm running at this lower voltage? (assuming it is OK to do so!)

PaulBysouth 29th September 2011 07:59 AM

col_s,
Adjust R12 so that the minimum voltage across the dn2530 current source is about 3 volts (Drain to Source voltage). This will keep the dn2530 acting as a current source, and minimize the dissipation in it.

18 Vac transformer should give you 22 volt rails. Setting R12 to 1K (from 2.2k) should give a minimum of 3 volts (when the rail sags a bit) and a dissipation of less than 100mW.

Paul Bysouth

AKSA 29th September 2011 10:06 AM

Thanks Paul!

Colin, wot 'e said, OK?

Hugh

col_s 29th September 2011 10:29 AM

Beautiful! Thanks guys.


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