06.12.2025 13:35
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Good evening~
Is this photo taken behind a windscreen glass? I really love the feeling of looking through glasses as the view will be slightly tinted.
Completed soldering of my CS4398-REV2 board, looks not bad after cleansing.
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ฆ้ปๆๆๆฏไธๆฏไธ็จฎๅฐๅคง่
ฆ็ใๅบๆผ้ป็ฃ่ผปๅฐๆดฉ้ฒ็ๅดไฟก้ๆปๆ๏ผ
Is brain sensing a type of side-channel attack on the brain, based on electromagnetic radiation?
Capacitive Touch Sensor, Rev.F
@raysky-rt.bsky.social ใใใฎใคใฉในใใงใ๏ผ
ๆฏ่ชๅทฑ OC ๏ผๆ่
่ชชๆฏ่ช่จญ๏ผ็ๆ็ซใ
An illustration of my OC by RaySky.
Working on my OC...
Yes!
New Board Arrived
Lovely BGA chips
some one screenshotted me when I was streaming
having difficulties with BGA packages.jpg
ๆไบบๅจๆ็ดๆญๆๆชๅไบ
่ขซ BGA ๅฐ่ฃ็บ้ฃ.jpg
It's a common feature for most EDA softwares. Usually, fifferent layers have different default colors, like top layer is red and bottom layer is blue. You can turn of custom net color and they will show in the default colors.
white pupils looks... mysterious, yet very adorable
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They are actually net colors~ You can assign colors to nets or net classes in this tab. I would prefer assigning different protocols & power rails with different colors.
WIP
Isn't it strange to use a STM32H7 + HS PHY, with a old DAC chip (CS4398) which is almost as old as me...?
But it's interesting that, CS4398 actually lived 20 years and it's still not discontinued.
Yes, they are feedthrough capacitors. They can efficiently filter out high frequency interferences & spikes.
I haven't used them before... But one member in a group recommended them and I want to give it a try.
Yes! It's TPS63070.
erotic PCB layout
It's KiCAD 9!
WIP
Price of STM32 microcontrollers are rising, the interface chip is twice more expensive than that DAC chip...
Maybe I will use CS43131 later, although it's not challenging as it integrated an HP-AMP which can simplify the design.
3rd order low-pass filter. A simple RC filter followed by a Sallen-key filter. The latter filter is compensated to achieve flat group delay in pass band.
ไธ้ไฝ้ๆฟพๆณขๅจ๏ผไธๅ็ฐกๅฎ RC ๆฟพๆณขๅจไนๅพ่ท่ไธๅ Sallen-key filter. ๅพ่
็ถ้่ฃๅ๏ผๅฏไปฅๅจ้ๅธถไธญๅฏฆ็พๅนณ็ทฉ็็พคๅปถ้ฒใ
DAWN PRO
They may have better performance, but I can hardly identify the difference between playback devices with my ears.
Test result is slightly better than on board audio, but I suppose the result is limited by the recording device & testing environment, which are quite bad.
Tested my CS4398 DAC (Rev 1), its performace isn't as worse as I expected... Although THD+N is really bad (0.02% @ -5dB, 0.01% or 0.008% @ -10dB)
๐๐น
From the experience on last CS4398 DAC project, I decided to make a new CS4398, with STM32H7 as interface and some second hand OP1612 apmlifiers.
H750 is quite cheap now. It's very fast, plus bunches of peripherals that I may or may not use.
ในในใผใญ
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ๅไฝ Pixiv ID: 126483504