Another project, all digital DDX amplifier

[alkasar]

also the + sign is useless

 

[Kjeldsen]

Looking great. What is the power for these modules? I have MiniAMP from MiniDSP and ould use an all digital amp with more power for the subs.

 

[t-head]

2x50W + 1x100W (?)

 

[hifimediy]

Hi, the output power depend on the power stage chips(sta505~517) and the input voltage, and also load impedance.
For example, sta505 is used, so it will be 50W@8ohm+50W@8ohm +100W@4ohm when about 30VDC.

 

[hifimediy]

simple remote controller

Any idea？

 

[Havoc08]

Any idea？

What do you want discussed? Layout or?

Please write what functions you can use in the amp for us to be able to evaluate which buttons would be nice on the remote

 

[Nick122147]

Any idea？

Oh, remote ! I'm excited. I haven't had a remote in my system for ages..

 

[Tekko]

Channel should be source. What would the F1-3 buttons be for ?

 

[Havoc08]

Channel should be source. What would the F1-3 buttons be for ?

Wondered about the same, but thought I was lacking knowledge.

 

[mikeh49]

The left hand layout for me. UP-DOWN is more intuitive (than LEFT-RIGHT) for my brain for volume and "channel" (which I assume is source).

 

[alkasar]

The left hand layout for me. UP-DOWN is more intuitive (than LEFT-RIGHT) for my brain for volume and "channel" (which I assume is source).

+1
layout A is more intuitive.

 

[sz_ahong]

The PCB Layout have a big problem, The output filter coils,placed the same direction,it will be cross talk between each other

 

[Nick122147]

The PCB Layout have a big problem, The output filter coils,placed the same direction,it will be cross talk between each other

The TK2050 boards which has the same output filter coil placement, doesn't have this problem.

 

[Havoc08]

The TK2050 boards which has the same output filter coil placement, doesn't have this problem.

Neither has the 41hz amps like amp9 with 8 coils next to each other.

 

[sz_ahong]

The coils without shield, the more output power,then the more magnetic-flux leakage.

 

[hifimediy]

The coils without shield, the more output power,then the more magnetic-flux leakage.

Hi, I think find a best solution is not just see one side, if you have something to prove your option, pls show to us and we will be glad to learn.

 

[hifimediy]

In my opinion, the cross talk is very weak and you can even ignore it. I prefer focus on something more important like what I'm doing.

 

[Havoc08]

the amp 9 is 4x100watt with no crosstalk and as far as I read, the toroids are pretty good at containing the EMI.

 

[udailey]

In many tube amp builds the builder will turn transformers at a 90degree angle to each other to stop crosstalk. I think that if someone were worried about it this could be a solution to try in this implementation. But if there is only the potential for crosstalk and not actually any crosstalk then there is no problem no matter how close or what position the inductors are.
Sure there is not room but you could mount half of them on the bottom of the board. Problem solved if there were even a problem.
Uriah

 

[Sangram]

Though you're some way along the development, I would put in another vote for a stereo setup instead of a 2.1. Most subwoofers already have a high level crossover which can be used with a stereo setup if required, and (IMHO) the use of a subwoofer in a stereo setup is in itself a compromise, being the domain of PC sound (rather than High fidelity reproduction) systems.

And a 5.1, for the HT crowd I wonder how you'll get Dolby and DTS decoding into it....

On another note, when are the T3 boards without the power supplies expected to release? As of now the shop only has the single power supply and protection board as a bundle with the T3, but I may be using my own linear supplies - I already have too many transformers and capacitors Apologies for going off topic. I do want to explore Class T, after Class D was a wipeout for me