CT7302PL

[savan]

Anybody explain why I can't get excatly the same parameters like from SigmaDSP, I have made functions for calcultating coeficients and its very similar but as you can see its diferent a bit. Here is my code https://pastebin.com/izF4Rp3u and screenshoot from SigmaDSP and Putty values from my C program . Dsp is ADAU1462, filter is of type 2nd order general filter, clickless (HW slew). Might be that I need to add slew value to the formula? What I have missing do you have idea? Thanks!

 

[savan]

Ok, got it https://pastebin.com/NBY99Z0T

Here is concept

 

[quanghao]

Thành công trong khái niệm DDPD! Tiếp theo, điều tôi muốn làm là sử dụng hai ct7302pl, cái đầu tiên để xử lý quang, usb và mọi đầu vào khác và chuyển đổi nó thành PCM, sau đó PCM đó chuyển sang ADAU1462, hơn là CT thứ hai làm bộ chuyển đổi sang DSD64 để xuất ra DDPD. Tôi đã thử nghiệm DDPD với DSD256 thành công, không có cách nào để kiểm tra DSD512 bằng Amanero làm tín hiệu thử nghiệm hiện tại nhưng tôi tin rằng DDPD cũng không có vấn đề gì với DSD512. So sánh giữa DDPD và máy nước nóng dòng chảy là DDPD có dòng chảy bit và máy nước nóng có dòng nước Ngoài ra, tôi có kế hoạch dùng thử raspberry pi 4 barebone os và sử dụng gpios để cung cấp DDPD với DSD máng gpio, cũng để triển khai camilladsp... Xin vui lòng Nghe

How to make Amanero run Dsd 512-Cách làm Amanero chạy Dsd 512​

please thí link video :

thanks

 

[savan]

In relation to post 82, first ganFet prototype, UVP, OVP, cycle by cycle OCP, temp, DC, LPM, autostart, standabay... etc a lot of protections and features. Working on Hypex SMPS400-180 x 2 mono. CNC machined heatsink 105x76 at a bottom. No opamps... etc

 

[savan]

Finito! If it sound good as 5V concept I will open new thread and give you schematic of the 5V concept including boom and gerber

 

[savan]

Fronted for DDPD almost finished, remain J.Didden on the left bottom of the pcb and rest of some routing. Specialy made J.D. 5V pre-regulator https://www.diyaudio.com/community/threads/super-regulator.247281/post-7244812 to supply ten small 3.3V and 1.2V regulators on this pcb. Master clock CCHD-575 with CY2308SXI-2 zero delay divider & buffer

 

[savan]

DDPD priject is now open source, more info https://www.diyaudio.com/community/threads/direct-digital-power-dac-ddpd.395974/

 

[savan]

Frontend for new ganFet DDPD based on two ct7302pl, ct7601, dsp, bletooth, fm radio

 

[savan]

Jet another DSC with discrete i/v, mfb, tone control and se to diff, will combine them with ucd180 and digital frontend based on ct7302pl. This one is mono, single ended. Pcb 75x50mm

 

[savan]

Isobuck adjustement on new Direct Digital Power Dac (DDPD) based on isolated ganFet full bridge, hope next week the rest get soldered

 

[savan]

Almost done, a few components left to finish. Heatsink also designed, it will go to the bottom of the pcb.

 

[savan]

Brother & sister == SMPS400A180 + DDPD

Mono pair, I want dual mono, so need another ddpd+smps. Box layout will be mono left, than metal partition as rfi shield, in the center DDPD frontend, than again metal partition, than mono right. Box will be CCA ~300 x ~200 mm

 

[savan]

Pcb finished, waiting heatsink from manufacture. The next step is soldering frontend which contain two ct7302, ct7601 usb, dsp, fm radio, bluetooth, 4 optical inputs, two i2s inputs, after that need to finish atenuator+dummy load+diy aux0025 filter and only than I will be ready to connct things together to power supply and test it, a lot of work : )

 

[dawa]

Looks awsome!

 

[savan]

Today I have finished ddpd by installing his bottom heatsink, and connected with smps, on my surprise everything ok, it promising! : ) Audio test will be after frontend get finished

 

[savan]

Project is unsucesfull! Problem to stabilise MAX17687 iso buck regulator, bottom-right at the picture and all the things like linear regulators have problem with huge ripple, even LT3045 is unable to completelly remove noise from iso buck. I'm tried everything to stabilise iso buck but unsucesfull, so gan ddpd project going from beggining : (

 

[Markw4]

If people are going to use SMPS for audio, usually they go to Meanwell for an off-the-shelf product. The output can be further filtered and regulated as desired, but its not too bad to begin with. https://www.meanwell.com/

 

[savan]

Is Hypex SMPS400A180 too bad? There is some small noise I can see on smps pos and neg and going to think that all that noise is copied to iso buck and isolated linear regulators, is that possible? Have no idea right now whats going on with MAX, didn't identified isue. I will probably use small torus transformer for the isolated things and linear regulators, half bridge will be probably left on SMPS but hmm don't know right now

 

[Markw4]

Don't know about the Hypex SMPS, myself.

 

[bohrok2610]

Problem to stabilise MAX17687 iso buck regulator, bottom-right at the picture and all the things like linear regulators have problem with huge ripple, even LT3045 is unable to completelly remove noise from iso buck.

Your problem may be caused by "polluted" ground as there does not seem to be any isolation between grounds. Is this the layout you are using? Have you posted the schematic?

Have you checked this: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX17687EVKITA.pdf