PSU to Aleph 2

Pboden · 16th October 2004, 11:35 AM

Is there a limit of voltage to the powersupply for an Aleph 2?
I see from the gallery in passdiy that there is secondaries of both 33v and 37v and from an old project I have a 650VA/40V. Would that be an OK?

tomchaoda · 16th October 2004, 02:49 PM

as long as the output rail is around 45V, minor difference in transformer secondary is fine. However, your 40V maybe a little bit high, since the higher the output, the higher of power dissipation will be.

Thomas

Brian Donaldson · 16th October 2004, 04:15 PM

go with the 40V transformer, and add 2 more fets, and you'll get more like 120W. The front end circuit works fine anywhere from 25v to70 volt rails. the key is balancing the bias current so you current limit at the same time (or a little above) you voltage limit (clip)

moe29 · 17th October 2004, 06:45 PM

Brian, i knew you were going to say add a FET!

For my Aleph 2 i used 37V secs. and got 45V rails exactly.

-with 1 thermistor on the AC line in and 2mH L's between PSU caps, their additive voltage drop figured in.-

Brian Donaldson · 17th October 2004, 09:03 PM

Who said size doesn't matter... They obviously are underendowed.

tomchaoda · 17th October 2004, 10:14 PM

as Brian said, the front circuit is basically the same with minor difference in each Aleph. This is the chart:

http://www.penguinlovers.net/audio/aleph-chart.jpg

Thomas

Pboden · 21st October 2004, 01:10 PM

Ok... I probably go for two new ones. I do have opportunity to buy 2 pc of 990VA/ 38V or two with the 33V secondaries. I will be using 4 Nippon 68000uf/50V each ch., but I am not capable of figuring out if the ending rail. Any idea ?
and do it have to be at 45V point blank?

moe29 · 21st October 2004, 01:56 PM

no, you don't have to be exactly at 45V rails.

this Aleph 2 in the PassDIY Gallery is using 33V secondaries:

Marijan's Aleph 2

Go for it!

VanguardVillage · 26th October 2004, 01:41 PM

i get one simens monster 2500w transformer in my stock.it's pri and sec voltage is just the same -220v.i'd like to rebuild the trans so as to have 2x 37-0-37v sec power supply and put the trans and the caps isolated from the main board.does my idea possible or inpossible?thx!

E. Pardaans · 3rd June 2005, 10:04 AM

Hello everybody,

What happens to the ESR value of capacitors when you parrallel them.
I have been looking for this information for weeks now but couldnt find it.

Is it possible to use the ZEN 4 regulated powersupply for the powersupply of a aleph-2

Edwin

16th October 2004, 11:35 AM	#1
Pboden diyAudio Member Join Date: Mar 2004 Location: Norway	PSU to Aleph 2 Is there a limit of voltage to the powersupply for an Aleph 2? I see from the gallery in passdiy that there is secondaries of both 33v and 37v and from an old project I have a 650VA/40V. Would that be an OK?

26th October 2004, 01:41 PM	#9
VanguardVillage diyAudio Member Join Date: Oct 2004	for¡¡aleph2 i get one simens monster 2500w transformer in my stock.it's pri and sec voltage is just the same -220v.i'd like to rebuild the trans so as to have 2x 37-0-37v sec power supply and put the trans and the caps isolated from the main board.does my idea possible or inpossible?thx!

3rd June 2005, 10:04 AM	#10
E. Pardaans diyAudio Member Join Date: Nov 2004 Location: Spijkenisse Zuid Holland	Hello everybody, What happens to the ESR value of capacitors when you parrallel them. I have been looking for this information for weeks now but couldnt find it. Is it possible to use the ZEN 4 regulated powersupply for the powersupply of a aleph-2 Edwin __________________ Still in the learning proces.

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16th October 2004, 02:49 PM	#2
tomchaoda diyAudio Member Join Date: Sep 2003 Location: New Jersey	as long as the output rail is around 45V, minor difference in transformer secondary is fine. However, your 40V maybe a little bit high, since the higher the output, the higher of power dissipation will be. Thomas

16th October 2004, 04:15 PM	#3
Brian Donaldson diyAudio Member Join Date: Jan 2003 Location: Texas, Love it or leave it	go with the 40V transformer, and add 2 more fets, and you'll get more like 120W. The front end circuit works fine anywhere from 25v to70 volt rails. the key is balancing the bias current so you current limit at the same time (or a little above) you voltage limit (clip)

17th October 2004, 06:45 PM	#4
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	Brian, i knew you were going to say add a FET! For my Aleph 2 i used 37V secs. and got 45V rails exactly. -with 1 thermistor on the AC line in and 2mH L's between PSU caps, their additive voltage drop figured in.-

17th October 2004, 09:03 PM	#5
Brian Donaldson diyAudio Member Join Date: Jan 2003 Location: Texas, Love it or leave it	Who said size doesn't matter... They obviously are underendowed.

17th October 2004, 10:14 PM	#6
tomchaoda diyAudio Member Join Date: Sep 2003 Location: New Jersey	as Brian said, the front circuit is basically the same with minor difference in each Aleph. This is the chart: http://www.penguinlovers.net/audio/aleph-chart.jpg Thomas

21st October 2004, 01:10 PM	#7
Pboden diyAudio Member Join Date: Mar 2004 Location: Norway	Ok... I probably go for two new ones. I do have opportunity to buy 2 pc of 990VA/ 38V or two with the 33V secondaries. I will be using 4 Nippon 68000uf/50V each ch., but I am not capable of figuring out if the ending rail. Any idea ? and do it have to be at 45V point blank?

21st October 2004, 01:56 PM	#8
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	no, you don't have to be exactly at 45V rails. this Aleph 2 in the PassDIY Gallery is using 33V secondaries: Marijan's Aleph 2 Go for it!

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