aleph p 1.7 pwr supp. questions - diyAudio
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Old 20th July 2003, 01:42 AM   #1
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Question aleph p 1.7 pwr supp. questions

I am going to build my first pass diy project after reading these forums for a year now. i am going to build the aleph P 1.7 with the 1.0 volume control plus add a remote and a display for the selected input.
My first question is with the power supply ......... should i use 2 power supplies, one for left and one for right?
Is there anything to be gained from this? left-right isolation, clarity?

My next 2 questions are on the pwr. supp. circuitry:
What is the value of R121 under Q25?
What is the power ratings on all of the zeners in this circuit?
It looks to that a 1 watt zener diode will work for all of these am i right?
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Old 20th July 2003, 02:10 AM   #2
jleaman is offline jleaman  Belgium
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First off. Congrats. im building one too.

see ........ http://24.69.72.2/view_album.php?set_albumName=album02


Also i sujest 2 psu's one for left and the other for right.


the other on the zener's are 1 watt and 9.1v i believe.

and ill look up your question about the

(What is the value of R121 under Q25? )
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Old 20th July 2003, 02:14 AM   #3
jleaman is offline jleaman  Belgium
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Where is R121 on your board.?
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Old 20th July 2003, 02:35 AM   #4
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wow nice pictures!
I don't yet have a board but am planning on prototyping the circuit first and then getting the boards.

R121 is right below Q25 of the pwr supply where the 14v display board connects just below the relay voltage connect (aleph P 1.7). It is from the aleph P 1.7 service manual on passlabs.com
http://www.passlabs.com/pdf/aleph/apserv17.pdf


What parts sound good? audiophile at percy, parts connexion ect. or just digikey and mouser?
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Old 20th July 2003, 02:42 AM   #5
jleaman is offline jleaman  Belgium
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Who does the boards for this Schematic you gave me..?
Attached Images
File Type: jpg pre.jpg (65.1 KB, 617 views)
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Old 20th July 2003, 05:08 AM   #6
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That's the factory PCB. Page 12 in the 1.7 pdf file.
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Old 20th July 2003, 05:10 AM   #7
jleaman is offline jleaman  Belgium
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Just a thought and a question. Can we buy that pcb? Prolly not right ?
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Old 20th July 2003, 03:42 PM   #8
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Not that i am aware of, I will probably have mine made or do them myself.
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Old 20th July 2003, 06:55 PM   #9
jleaman is offline jleaman  Belgium
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Shaun When you starting your board.? I like the layout of that one but i too want a desplay and input Selector with relays.. Can you keep me posted if you also want you can talk to me Via email as i want to help if you need it and keep up 2 date with you on your project. Maybe ill pitch some money towards your way to get a board made too..
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Old 20th July 2003, 09:30 PM   #10
Jaac is offline Jaac  Netherlands
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iám also building a p 1.7 see my website for some pictures. i have used two power supplies. http://www.jaac.tk
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