aleph p 1.7 pwr supp. questions

[Shaun Perez]

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]

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]

Where is R121 on your board.?

 

[Shaun Perez]

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]

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

 

[Dane]

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

 

[jleaman]

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

 

[Shaun Perez]

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

 

[jleaman]

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]

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

 

[jleaman]

i see blank Page.

 

[Jaac]

i see blank Page.

hhm works here but try this one http://ftp.alwaysaccess.nl/~jaac/jaac/preamp.htm

sorry for you it is in dutch

 

[Shaun Perez]

are the 2 pwr supplies for left and right or for analog and digital/non audio?
how does it sound? I wish i could read the words!!!!

 

[jleaman]

There for left and Right.

 

[Jaac]

yes for left/right i have no digtal stuff on mine pre amp. i've build ( still building) the power supply in a differend case. the case of the preamp it self is in a 19" case and is not yet ready i only need to fit a 4 deck attenuator and a source select switch and the left pcb and the connectors at the back of the housing. alot to do i think first i'am on holliday to rimini italy.

 

[Wes Marquenie]

I'm also strting with a aleph p 1.7. The mainboard layout is fisished. (http://www.diyaudio.com/forums/showthread.php?postid=207119#post207119).

The controls consist of an ATMEGA163, a 4x20 lcd, a volume and input rotary encoder and an iR-eye. Layout finished, not testen and the firmware is not ready yet.

The input selector and volume control relay boards and power supplies must still be designed.

 

[Shaun Perez]

ok i have decided to layout the circuit in a mirror fashion, left on one side and right on the other and therefore use two power supplies. Wow total channel seperation!!!!! I have just ordered the two toriods from avel lindberg Y23 Range 30va 30+30.