new batch of mini Aleph amplifier and PSU boards - Page 23

vgeorge · 14th March 2010, 06:20 PM

That' s what I am using with my F5.
No problem.

androuski · 14th March 2010, 06:46 PM

Good news !
Is it a stereo or dual mono configuration ?
How did you populate the pcb ? If you have any photo to post here it would be great

Thank you

vgeorge · 14th March 2010, 07:07 PM

it' s a dual mono. Components were from an old GB for the A30.
There are 22000uF x 6 per chanel.
Now they are to the sides of the chassis and photo is not easy to take.

androuski · 14th March 2010, 07:25 PM

Thanks,
I also wonder about R3 to R12 : are they populated or left with jumpers ?
So you get 132 000µf on each side ! That's huge... what kind of transformer did you mount ?

vgeorge · 14th March 2010, 08:05 PM

They are populated with .47r resistors.
Transformers are one per channel 250VA 2x18, because I already had them. If I didn' t already had them, I would get bigger.

androuski · 14th March 2010, 09:29 PM

Thanks again for replying !
What is the purpose of those 0,47 resistors ? Korben said that he has left them for the mini aleph... I don't understand this PSU topology...

vgeorge · 14th March 2010, 09:55 PM

It helps lowering ripple on dc voltage. You can put the resistors and then bypass them with a wire and see what you like best.

androuski · 15th March 2010, 12:06 AM

Ok,
I'll try both configuration maybe,
Nicolas

jleaman · 15th March 2010, 11:44 PM

I have had a few email's over the last few weeks for these files, I have dug them from my archive of files from LONG time ago.

To those who need the aleph psu board BOM, i have attached it along with the BOM for aleph 30 & Mini.

Jase

androuski · 28th March 2010, 10:20 AM

Received,
thanks

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14th March 2010, 06:20 PM	#221
vgeorge diyAudio Member Join Date: Mar 2004 Location: poros island	That' s what I am using with my F5. No problem.

14th March 2010, 06:46 PM	#222
androuski diyAudio Member Join Date: Jan 2008	Good news ! Is it a stereo or dual mono configuration ? How did you populate the pcb ? If you have any photo to post here it would be great Thank you

14th March 2010, 07:07 PM	#223
vgeorge diyAudio Member Join Date: Mar 2004 Location: poros island	it' s a dual mono. Components were from an old GB for the A30. There are 22000uF x 6 per chanel. Now they are to the sides of the chassis and photo is not easy to take.

14th March 2010, 07:25 PM	#224
androuski diyAudio Member Join Date: Jan 2008	Thanks, I also wonder about R3 to R12 : are they populated or left with jumpers ? So you get 132 000µf on each side ! That's huge... what kind of transformer did you mount ?

14th March 2010, 08:05 PM	#225
vgeorge diyAudio Member Join Date: Mar 2004 Location: poros island	They are populated with .47r resistors. Transformers are one per channel 250VA 2x18, because I already had them. If I didn' t already had them, I would get bigger.

14th March 2010, 09:29 PM	#226
androuski diyAudio Member Join Date: Jan 2008	Thanks again for replying ! What is the purpose of those 0,47 resistors ? Korben said that he has left them for the mini aleph... I don't understand this PSU topology...

14th March 2010, 09:55 PM	#227
vgeorge diyAudio Member Join Date: Mar 2004 Location: poros island	It helps lowering ripple on dc voltage. You can put the resistors and then bypass them with a wire and see what you like best.

15th March 2010, 12:06 AM	#228
androuski diyAudio Member Join Date: Jan 2008	Ok, I'll try both configuration maybe, Nicolas

28th March 2010, 10:20 AM	#230
androuski diyAudio Member Join Date: Jan 2008	Received, thanks

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