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Old 25th December 2009, 11:48 AM   #31
Salas is offline Salas  Greece
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Quote:
Originally Posted by samoloko View Post
Is there a benefit to go with higher than 4700 uF caps when using Salas shunt to power dacs +- 5V -15V or output dac stages like Pass B1, D1
I would concentrate in the quality of the cap more in that case.
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Old 30th December 2009, 01:08 AM   #32
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Default Would this work for the F5?

I'd like to use regulated power supplies for an F5 project. Would the Hypnotize boards work for +- 24V and 6 amps?
Thanks,
Paul
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Old 30th December 2009, 02:40 AM   #33
Salas is offline Salas  Greece
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Theoretically yes, but it will be very difficult to match the sides with the LED references and 0.3x resistors. I would use a Vbe controlled source for that. How much more is the 6A than the bias needed per side? You better be economic, so the dissipation is mainly kept at the load.
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Old 30th December 2009, 08:59 PM   #34
jleaman is offline jleaman  Belgium
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I think i might try this project for my aleph mini's @ 20V Pos/Neg.

Wonder if it will improve the sound at all.


J'
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Old 30th December 2009, 09:46 PM   #35
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Quote:
Originally Posted by jleaman View Post
I think i might try this project for my aleph mini's @ 20V Pos/Neg.

Wonder if it will improve the sound at all.


J'
Based on Salas first post, in may be do-able, but one would have to be creative and get the diodes powerful enough, and off board and PCB, since the holes dont except MUR860's, etc. By default the limit is 1A, and this is based on the MUR120 diodes which are a perfect fitr. I've seen at least one proto builder find a way to put MUR860s in anyways.

If you do it, I'll do it...At some point.
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Old 30th December 2009, 10:01 PM   #36
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by Tea-Bag View Post
Based on Salas first post, in may be do-able, but one would have to be creative and get the diodes powerful enough, and off board and PCB, since the holes dont except MUR860's, etc. By default the limit is 1A, and this is based on the MUR120 diodes which are a perfect fitr. I've seen at least one proto builder find a way to put MUR860s in anyways.

If you do it, I'll do it...At some point.
If i do it, ill wire diodes off board and beside the fet's.

J'
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Old 21st January 2010, 06:51 PM   #37
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Hi Salas

would you please explain Setting the current formula

ICCS=2.2V/Rset
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Old 21st January 2010, 07:43 PM   #38
Salas is offline Salas  Greece
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It comes from 3LedsVf minus Vgs divided by R1. That 2.2V is a measured ballpark from various builds, so to project some R value, since there is tolerance both in Leds, their local NJFET CCS, IRFP Vgs. You always should measure the drop on the set resistor(s) R1 in the end and divide by Ohmic value so to really know the running current in each build, and adjust if necessary.
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Old 22nd January 2010, 06:09 AM   #39
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thank you
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Old 22nd January 2010, 11:47 AM   #40
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Quote:
Originally Posted by Salas View Post
It comes from 3LedsVf minus Vgs divided by R1. That 2.2V is a measured ballpark from various builds, so to project some R value, since there is tolerance both in Leds, their local NJFET CCS, IRFP Vgs. You always should measure the drop on the set resistor(s) R1 in the end and divide by Ohmic value so to really know the running current in each build, and adjust if necessary.
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