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Leeuwarden 11th October 2009 09:43 AM

APOX volume-input for Aleph P1.7 question
Hi all,

After playing with a Thel pre-amp, three different tube pre-amps I decided to build a B1. B1 one was the best pre-amp I have ever used in my system but I did not have enough gain.

I stumbled into a pair ready build P1.7 boards and decided to buy them.
The seller also offered me a ready build APOX. Just what I needed so bought that also. So here comes the problem an question. I'm not an electronics engineer so I need a little help.

Question 1; I have build a 5V powersupply. Can I just connect this to the APOX IR1 (rev3), the APOX-1 (rev3) and the APOX-IS 1(rev2)?

Question 2; It took me some time to understand the term "daisy-chaining" but I managed. Is it correct to daisy-chain from IR-1 to APOX-1 I2C "IN" and from APOX-1 I2C "OUT" to IS-1 I2C. Is there a difference between I2C SV 1 or SV2 on IS-1?

Question 3: If I have done all the above, can I connect power without smoke or flames?

So far the questions. There will prabably more in the future... :bulb:

Leeuwarden 12th October 2009 02:44 PM

Anyone? :Popworm:
Or should I just jump and power up :scared:

DougL 12th October 2009 03:25 PM

I took a quick look. I must admit I am not sure exactly what you have.
The designer frequents this board. Google of APOX brought up this thread

Having said that, everything I saw was 74xxHC TTL 5 volt parts. The Sales blurb specified +5V at unspecified current.

If you want more intelligent help, post the links to the products you have.
I am very poor at guessing.



Leeuwarden 12th October 2009 06:56 PM

1 Attachment(s)
Hi Doug. Thanks for your reply.

Other information is here: Apox Controls
The APOX is not for sale anymore...

This is how it looks.

Bottom PCB is a double deck. Connected through SV1.
My guess is to connect the APOX 1 (middle PCB) to SV1.

Pic below is how I think it should be done.

Leeuwarden 13th October 2009 02:25 PM

Looks like the mailadres on the APOX site is out of order... Was to be expected I suppose:(

Sheldon 13th October 2009 03:34 PM

Instructions on this page: Apox Controls

Leeuwarden 13th October 2009 06:48 PM

I have read the instructions. My drawing is based on it. But there is a little voice in my head that says "be carefull". After reading the manual again I still come to the conclusion that my drawing is correct. I can connect the red line to SV1 because that is also where the connection with the board below is.
Do you agree?

DougL 13th October 2009 07:35 PM

I took a look at your products.

You have correctly drawn the control hookups.
Basically the I2C control path is a daisy chain. Controller hooks to first board, first board hooks to second board. Repeat if additional boards.
Looking at the schematic, input and output I2C are just jumpered together.
Really no electrical difference if you use the input or output for I2C. Use one or the other to connect the orange to the bottom board.

I assume you have a handle on the audio path, which is not shown in your drawing.

Looks like 5V at less than 2 amps is required to run this setup.

Nice products.

Good Luck.


Leeuwarden 13th October 2009 07:53 PM

Thanks for checking Doug!
I'm not sure if I understand the quote below.
(do you mean how to connect the pre-amp to the boaards?)


Originally Posted by DougL (
I took a look at your products.

I assume you have a handle on the audio path, which is not shown in your drawing.

Sheldon 13th October 2009 08:06 PM

You don't show the second IS1 board, but one connector goes where you have shown it with the question mark. I believe it can go in either position. Then the other connector is used to "daisy chain" it to the second IS1. I don't think you can hurt anything with these connections.


edit: Just notice Doug's reply. I concur.

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