Another project, all digital DDX amplifier

[dubai2000]

I'd also like to see the possibility for analog input to continue usinge already existing gear. Otherwise this can turn into a very interesting project.

 

[hifimediy]

I'd also like to see the possibility for analog input to continue usinge already existing gear. Otherwise this can turn into a very interesting project.

It's digital input only, but I think later we can add a ADC module for your application. But if you want to use analog input only, AMT2050 v1 through T3 can be considered.

 

[teamacc]

How about including a TC2000 chip that can be switched on/off for analog inputs? Then you still have the tripath magic on analog inputs and the all digital amp for digital sources.

 

[hifimediy]

How about including a TC2000 chip that can be switched on/off for analog inputs? Then you still have the tripath magic on analog inputs and the all digital amp for digital sources.

Sounds good. Any idea about how to switch the pwm signal?

 

[teamacc]

I think both chips have a sleep mode. How about muting the outputs, switching the chip that is currently outputting into sleep mode, waking up the other, and un-muting the outputs?

 

[hifimediy]

I will test it later, but may be it will be next project, because I will get the pcb soon, so there are already many works waiting.

 

[hifimediy]

boards

Hi all, I got the pcb and here is the first board.

 

[Tekko]

Looking good! Any chance of getting a sample to evaluate ?

 

[hifimediy]

sure, but not now. I'm still working on the MCU program now.

 

[Tekko]

I wish you luck with that. Im sure this will be a sweet sounding amplifier. Keep up the good work.

 

[udailey]

Dibs! I want one as soon as you can! Seriously.
Uriah

 

[hifimediy]

Just make all parts work today

 

[Tekko]

Whatz the lcd for ? Showing the volume setting and which input is active ?

What sample rates and formats does it accept on the digital input ?

 

[hifimediy]

Whatz the lcd for ? Showing the volume setting and which input is active ?

What sample rates and formats does it accept on the digital input ?

yes, I think lcd can display more infomation, but need more time to finish.
Optical and coaxial accept 96kHz/24bit and usb 48khz/16bit.

 

[hifimediy]

demo photo

any idea to improve?

 

[jtjy]

any idea to improve?

IMO blue LED would be nicer. Temperature abit reluctant.
Also which dac chip are u using?
My Idea would be something like this.


Time

USB/ Tor / Coa
24 bit - 92 khz

Volume : ||||||||||||||||||||||
​

 

[kc7wdg]

Sweet would love to test that thing out! I would run it 8+ hrs a day every day in place of another amp.

I like seeing the temp as I bet its showing temp near chips and in a case is a good thing to see.

 

[jtjy]

weird . my post came up wrongly. the USB and 24bit should be in the middle.

 

[hifimediy]

IMO blue LED would be nicer. Temperature abit reluctant.
Also which dac chip are u using?
My Idea would be something like this.


Time

USB/ Tor / Coa
24 bit - 92 khz

Volume : ||||||||||||||||||||||
​

Thanks for your suggestion.
We use sta320+STA50x as power DAC.
I will improve the lcd view. The LED is build-in so I can't change the color now, but I will use 2 different display later.

 

[hifimediy]

Sweet would love to test that thing out! I would run it 8+ hrs a day every day in place of another amp.

I like seeing the temp as I bet its showing temp near chips and in a case is a good thing to see.

The temperature sensor is included in MCU, so I just don't want to waste it.