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OLD THREAD DAC End by Andrea Ciuffoli

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#301
I had a thouhgt regarding the phase jumper.
Some Recordings are made out of phase and some in phase. It's realy hard to distinguish, but we all trust our ears to which recordings simply sound better.

When I get around to assemblin mine, I will put a switch on the fron panel of the case so I can switch to either in or out of phase "on the fly".

instead of the jumper block on the pcb, I'll find a header that I can use to wire to a switch.

Does anyone think having a switch instead of a jumper be problematic?

Perhaps the pcb layout can b designed to accomodate a users choice?

Jeff Davison
 
#302
Hi Jeff Davison!

The jump is to transfer the signal phase islands. So I put it on the PCB. And the path of the circuit as short as possible, should you do not use the wiring length.

This is an option for output, when used iv transformer or not! By simply connecting two points on the DAC PCB
Thank
 
#305
Plan for board completion

http://www.diyaudio.com/forums/group-buys/155960-dac-end-andrea-ciuffoli-group-buys-30.html

Dear All,
Firstly I would thank for your trust in myself and andrea in this design.

For a perfect completion, I may opt to have you all to take a look at the circuit and layout before I send it to printing plant.

Regarding schedule, the printing will start by January 18 and it will take 8 days. Plus two days for shipping to me, I can ship the boards out to you by January 28. This implies a 4 days delay compared to initial plan.

Regarding Paypal’s lock-up, the main reason is Paypal wants to see the evidence of shipping, which is yet available. I’m talking now with Paypal to sort out the situation.

For a solid, professional and hi-end boards are what I am striving for.

In post 297- 300
 
#307
ok, thanks..... then how about an on board relay?
That would keep the digital signal path as short as it needs to be, and it would give us the option of changing phase without having to open up the case of a finished unit.
JD

quanghao said:
Hi Jeff Davison!

The jump is to transfer the signal phase islands. So I put it on the PCB. And the path of the circuit as short as possible, should you do not use the wiring length.

This is an option for output, when used iv transformer or not! By simply connecting two points on the DAC PCB
Thank
Click to expand...
 
#309
Jeffrey Davison said:
ok, thanks..... then how about an on board relay?
That would keep the digital signal path as short as it needs to be, and it would give us the option of changing phase without having to open up the case of a finished unit.
JD
Click to expand...


Relay??
the signal does not go through relay, relay should not affect the signal

*and it would give us the option of changing phase without having to open up the case of a finished unit.**

That is a good idea and practical, but in this case I think not.
 
#312
This following circuit should work like a remote phase inverter.

I have simulated it with Winspice, see output.

It is too difficult implement it now because we need one more ic.
 

Attachments

  • PhaseInv1a.gif
    PhaseInv1a.gif
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#314
Here a final version of the in/out phase switch to test.

This will not be implement in this release of DAC board.

It use 2 x 74HC00 NAND instead of 1 x 74HC02 INVERTER.

This allow to use a remote in/out phase switch with a short signal wire.
 

Attachments

  • PhaseInv2a.gif
    PhaseInv2a.gif
    27.7 KB · Views: 475
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