aleph p 1.7 pwr supp. questions

Shaun Perez · 20th July 2003, 12:42 AM

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?

jleaman · 20th July 2003, 01:10 AM

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? )

jleaman · 20th July 2003, 01:14 AM

Where is R121 on your board.?

Shaun Perez · 20th July 2003, 01:35 AM

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?

jleaman · 20th July 2003, 01:42 AM

Who does the boards for this Schematic you gave me..?

Dane · 20th July 2003, 04:08 AM

That's the factory PCB. Page 12 in the 1.7 pdf file.

jleaman · 20th July 2003, 04:10 AM

Just a thought and a question. Can we buy that pcb? Prolly not right ?

Shaun Perez · 20th July 2003, 02:42 PM

Not that i am aware of, I will probably have mine made or do them myself.

jleaman · 20th July 2003, 05:55 PM

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..

Jaac · 20th July 2003, 08:30 PM

iám also building a p 1.7 see my website for some pictures. i have used two power supplies. http://www.jaac.tk

20th July 2003, 12:42 AM	#1
Shaun Perez diyAudio Member Join Date: Oct 2002 Location: Sacramento/San Diego	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?

20th July 2003, 08:30 PM	#10
Jaac diyAudio Member Join Date: Oct 2002 Location: Laren NH	iám also building a p 1.7 see my website for some pictures. i have used two power supplies. http://www.jaac.tk __________________ The right tool for the right job, a very nice Solarboat \|\| Ready for a groupbuy ? CLick

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Aleph P 1.7 questions	hags	Pass Labs	8	22nd October 2008 07:54 AM
An Excellent Overview of Pwr. Supp. Theory	Stocker	Power Supplies	3	27th April 2006 06:54 PM
more aleph 2 questions	Mattyo5	Pass Labs	19	19th February 2005 11:51 AM
Question about Dual Polarity Power Supp. (Ashamed to ask)	TaaJ	Chip Amps	11	28th August 2004 09:27 PM
Aleph 2 questions	Ilianh	Pass Labs	10	24th October 2002 01:00 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

20th July 2003, 01:10 AM	#2
jleaman Banned Join Date: Apr 2002	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? )

20th July 2003, 01:14 AM	#3
jleaman Banned Join Date: Apr 2002	Where is R121 on your board.?

20th July 2003, 01:35 AM	#4
Shaun Perez diyAudio Member Join Date: Oct 2002 Location: Sacramento/San Diego	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?

20th July 2003, 04:08 AM	#6
Dane diyAudio Member Join Date: Apr 2002 Location: Houston	That's the factory PCB. Page 12 in the 1.7 pdf file.

20th July 2003, 04:10 AM	#7
jleaman Banned Join Date: Apr 2002	Just a thought and a question. Can we buy that pcb? Prolly not right ?

20th July 2003, 02:42 PM	#8
Shaun Perez diyAudio Member Join Date: Oct 2002 Location: Sacramento/San Diego	Not that i am aware of, I will probably have mine made or do them myself.

20th July 2003, 05:55 PM	#9
jleaman Banned Join Date: Apr 2002	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..