Aleph-X builder's thread. - Page 10

Mark A. Gulbrandsen · 29th February 2004, 02:38 PM

To check a mosfet just use the same setup as if you were matching them. If you run across a broken one you will get very strange readings and it'll be quite obvious. With new mosfets I've never had one out of the tube that was bad.
Mark

yoke · 29th February 2004, 02:46 PM

Thanks Mark for replay...
But I bouth those ollready matched...so...can I just mesure some resistance betwin pins or something ?

Josip

promitheus · 1st March 2004, 10:21 AM

I have a question on the AXE-1 calculation sheet.
The voltage at the beginning is the overall voltage?
for instance when we have 30volts here does that mean that the power supply will have +/- 15 Volts?

Netlist · 1st March 2004, 10:30 AM

In your example that would be +/-30V.

/Hugo

promitheus · 1st March 2004, 10:37 AM

yeah that´s what I thought.
I did a few calculations.
What would be the lowest voltage that could be used without having to sacrifice quality?

rwagter · 1st March 2004, 11:40 AM

Anyone has experience with:

Vishay draloric's as sold by partsconnexion , they are 0.1% accurate

and really cheap....

Ralph

pinkmouse · 1st March 2004, 02:23 PM

I have split the IP issue off into its own thread here, it is a worthwhile subject, but we are trying to keep this thread pure and simple! Thanks

leadbelly · 1st March 2004, 02:41 PM

Quote:

Originally posted by pinkmouse
I have split the IP issue off into its own thread here, it is a worthwhile subject, but we are trying to keep this thread pure and simple! Thanks

Thank you!

SGregory · 1st March 2004, 05:32 PM

Here is the status of mine

A-X Monoblocks;
1kVA @21V dual secondaries Vic Magnetics
432,000 uF capacitance 216,000uF per Rail
CRCRC Filter Arangement 0.15Ohm R's On Sinks
Dual Rectifiers FRED 64amp from IXYS on Seperate Sink
Stacked type sink with 560Watt theoretical dissipation per side.
(calculation based on my ol fluid dynamics book) 30degree C

Will be using 16 devices per channel total with 10-12 amps bias
Theoretical Rail voltage is +/-23-24 Volts.
Total Dissapation will be 460Watts 230 per side

Any boo boo's so far?

Any Comments or Suggestions?
Regards
Scott Gregory

I will post pictures as soon as I can get them small enough.

Coulomb · 1st March 2004, 05:37 PM

Quote:

Originally posted by SGregory
Here is the status of mine

A-X Monoblocks;
1kVA @21V dual secondaries Vic Magnetics
432,000 uF capacitance 216,000uF per Rail
CRCRC Filter Arangement 0.15Ohm R's On Sinks
Dual Rectifiers FRED 64amp from IXYS on Seperate Sink
Stacked type sink with 560Watt theoretical dissipation per side.
(calculation based on my ol fluid dynamics book) 30degree C

Will be using 16 devices per channel total with 10-12 amps bias
Theoretical Rail voltage is +/-23-24 Volts.
Total Dissapation will be 460Watts 230 per side

Any boo boo's so far?

Any Comments or Suggestions?
Regards
Scott Gregory

I will post pictures as soon as I can get them small enough.

Won't 10 to 12 Amps of bias push your peak power output below 4 Ohms?

Regards

Anthony

1st March 2004, 02:23 PM	#97
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Split I have split the IP issue off into its own thread here, it is a worthwhile subject, but we are trying to keep this thread pure and simple! Thanks __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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29th February 2004, 02:38 PM	#91
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	To check a mosfet just use the same setup as if you were matching them. If you run across a broken one you will get very strange readings and it'll be quite obvious. With new mosfets I've never had one out of the tube that was bad. Mark

29th February 2004, 02:46 PM	#92
yoke diyAudio Member Join Date: Jan 2004 Location: Split	Thanks Mark for replay... But I bouth those ollready matched...so...can I just mesure some resistance betwin pins or something ? Josip

1st March 2004, 10:21 AM	#93
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	I have a question on the AXE-1 calculation sheet. The voltage at the beginning is the overall voltage? for instance when we have 30volts here does that mean that the power supply will have +/- 15 Volts?

1st March 2004, 10:30 AM	#94
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	In your example that would be +/-30V. /Hugo

1st March 2004, 10:37 AM	#95
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	yeah that´s what I thought. I did a few calculations. What would be the lowest voltage that could be used without having to sacrifice quality?

1st March 2004, 11:40 AM	#96
rwagter diyAudio Member Join Date: Jul 2002 Location: Netherlands	Anyone has experience with: Vishay draloric's as sold by partsconnexion , they are 0.1% accurate and really cheap.... Ralph

1st March 2004, 05:32 PM	#99
SGregory diyAudio Member Join Date: Apr 2003 Location: Southern Tier NY	Here is the status of mine A-X Monoblocks; 1kVA @21V dual secondaries Vic Magnetics 432,000 uF capacitance 216,000uF per Rail CRCRC Filter Arangement 0.15Ohm R's On Sinks Dual Rectifiers FRED 64amp from IXYS on Seperate Sink Stacked type sink with 560Watt theoretical dissipation per side. (calculation based on my ol fluid dynamics book) 30degree C Will be using 16 devices per channel total with 10-12 amps bias Theoretical Rail voltage is +/-23-24 Volts. Total Dissapation will be 460Watts 230 per side Any boo boo's so far? Any Comments or Suggestions? Regards Scott Gregory I will post pictures as soon as I can get them small enough.