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Old 5th March 2004, 08:41 PM   #1
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Question Aleph p 1.7 questions?

Hi,
I want to start working on P 1.7 preamp, but I have few questions for which I didn't found an answers. First, did Nelson used stepped attenuator? If not, can I use stepped attenuator for a volume control. If yes, which one? I'm trying to find an "ultimate" attenuator, but I'm not shure what to look for. Which resistors in attenuator?
Second, what about micro controller Phillips 87c752? It has been discontinued. Which one I can use instead? I don't know anything about micro controllers.
Last question. Is it possible to make it sound better than the original? I just want tons of transparency and musicality.
It is going to be connected to my almost done Aleph 5.
Thanks
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Old 6th March 2004, 10:23 AM   #2
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Talking volume...

look at this page... it is a copy of the original volumecontrol. The only difference is the number of steps and the function of the volume control. This one has more steps (256), where the original only used some of the 256 steps (i can't remember how many). I'm going to use this one i think... i'm also doing a aleph p1.7 with kristjians(?) (http://web.vip.hr/pcb-design.vip/) boards... good luck...

kongen
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Old 6th March 2004, 11:03 AM   #3
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You probably forgot to put a link for the page. Try again please.

Master; Which one did you use in the original?
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Old 6th March 2004, 10:48 PM   #4
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bbakota2000,

>> Phillips 87c752

A new chip exists LPC762

see http://www.semiconductors.philips.co.../file_454.html

I am looking at these for a CCS-X-BOSOZ with remote and stepped attenuator with relays...

I will need help to redesign a remote ...

Regards.

Alain.
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Old 7th March 2004, 06:29 PM   #5
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Default forgotten link...

Sorry about that... the link is http://home.tu-clausthal.de/~tpa/relais/relais.html...

kongen
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Old 13th March 2004, 01:20 AM   #6
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Ok thanks for the link.
What is the best stepped attenuator to use if I don't want to have a comfort of remote control and display? What kind do I have to use (balanced or no), and what are the pros and cons of the stepped attenuator versus let's say Alps Black Beauty?
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Old 13th March 2004, 03:59 AM   #7
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one argument for the stepped attenuator is the precision... Imagine the precision of each step if you are using 0.1% resistors compared to a potentiometer...
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Old 13th March 2004, 04:32 AM   #8
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If you havent seen this already check them out http://www.apoxcontrols.com/apox.htm
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Old 13th March 2004, 04:53 AM   #9
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For Aleph p 1.7 I need 2K and lowest one they offer is 5K. Does that make any difference?
One more question. What can I use instead of Wima MKS4 10uf/100V in P 1.7? I'll use kristijan's boards and I'm limited with space. Can I use Black Gate N series?
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Old 13th March 2004, 01:04 PM   #10
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Default Caps...

Yeah i had the same problem... either they were damn expensive or there weren't room for them. I ended up using some intertechnik, which i bought directly from their website... http://www.intertechnik.de/ go to the webshop and find the 100v mkt radials... about 3 euros per cap...

kongen
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