Cascade Kobayashi
@cascade.moe
🔧 Engineer Neko
en/zh-Hans/zh-Hant
cascade.moe
en/zh-Hans/zh-Hant
cascade.moe
Completed soldering of my CS4398-REV2 board, looks not bad after cleansing.
May 15, 2025 at 12:56 PM
Completed soldering of my CS4398-REV2 board, looks not bad after cleansing.
Capacitive Touch Sensor, Rev.F
April 30, 2025 at 12:37 PM
Capacitive Touch Sensor, Rev.F
April 29, 2025 at 6:00 AM
some one screenshotted me when I was streaming
having difficulties with BGA packages.jpg
有人在我直播時截圖了
被 BGA 封裝為難.jpg
having difficulties with BGA packages.jpg
有人在我直播時截圖了
被 BGA 封裝為難.jpg
April 7, 2025 at 10:58 AM
some one screenshotted me when I was streaming
having difficulties with BGA packages.jpg
有人在我直播時截圖了
被 BGA 封裝為難.jpg
having difficulties with BGA packages.jpg
有人在我直播時截圖了
被 BGA 封裝為難.jpg
white pupils looks... mysterious, yet very adorable
April 5, 2025 at 4:17 PM
white pupils looks... mysterious, yet very adorable
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.
April 3, 2025 at 11:14 PM
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.
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.
April 3, 2025 at 6:54 AM
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.
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.
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.
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.
April 2, 2025 at 3:04 PM
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.
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.
三階低通濾波器，一個簡單 RC 濾波器之後跟著一個 Sallen-key filter. 後者經過補償，可以在通帶中實現平緩的群延遲。
三階低通濾波器，一個簡單 RC 濾波器之後跟著一個 Sallen-key filter. 後者經過補償，可以在通帶中實現平緩的群延遲。
March 31, 2025 at 11:35 AM
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.
三階低通濾波器，一個簡單 RC 濾波器之後跟著一個 Sallen-key filter. 後者經過補償，可以在通帶中實現平緩的群延遲。
三階低通濾波器，一個簡單 RC 濾波器之後跟著一個 Sallen-key filter. 後者經過補償，可以在通帶中實現平緩的群延遲。
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.
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.
March 29, 2025 at 6:27 PM
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.
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)
March 29, 2025 at 7:44 AM
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)
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.
H750 is quite cheap now. It's very fast, plus bunches of peripherals that I may or may not use.
March 27, 2025 at 7:53 AM
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.
H750 is quite cheap now. It's very fast, plus bunches of peripherals that I may or may not use.
沒活了，找點東西臨摹。這次是小塗真紀。
是聽講座的時候開始摸的，不過沒有怎麼優化線條，所以大概顯得很亂。
原作 Pixiv ID: 126483504
是聽講座的時候開始摸的，不過沒有怎麼優化線條，所以大概顯得很亂。
原作 Pixiv ID: 126483504
March 20, 2025 at 1:51 AM
沒活了，找點東西臨摹。這次是小塗真紀。
是聽講座的時候開始摸的，不過沒有怎麼優化線條，所以大概顯得很亂。
原作 Pixiv ID: 126483504
是聽講座的時候開始摸的，不過沒有怎麼優化線條，所以大概顯得很亂。
原作 Pixiv ID: 126483504
Nia-chan / にあちゃん
Original Character of ゆーね (x.com/ayanepuna) さん
上課的時候摸的，不過我太菜了，所以不知道身體應該怎麼畫。
然後是發現了正臉其實很難畫這一事實。
Original Character of ゆーね (x.com/ayanepuna) さん
上課的時候摸的，不過我太菜了，所以不知道身體應該怎麼畫。
然後是發現了正臉其實很難畫這一事實。
March 17, 2025 at 5:36 AM
Nia-chan / にあちゃん
Original Character of ゆーね (x.com/ayanepuna) さん
上課的時候摸的，不過我太菜了，所以不知道身體應該怎麼畫。
然後是發現了正臉其實很難畫這一事實。
Original Character of ゆーね (x.com/ayanepuna) さん
上課的時候摸的，不過我太菜了，所以不知道身體應該怎麼畫。
然後是發現了正臉其實很難畫這一事實。
Good news: My fever reduced
Bad news 1: I still have a sore throat
Bad news 2: I broke my thermometer and I get some dangerous, liquid mercury
Bad news 1: I still have a sore throat
Bad news 2: I broke my thermometer and I get some dangerous, liquid mercury
March 11, 2025 at 2:29 PM
Good news: My fever reduced
Bad news 1: I still have a sore throat
Bad news 2: I broke my thermometer and I get some dangerous, liquid mercury
Bad news 1: I still have a sore throat
Bad news 2: I broke my thermometer and I get some dangerous, liquid mercury
Not good if there is few reference images...
This time it's (probably) not shota, but this doesn't matter.
(I draw unisex characters more like shota)
This time it's (probably) not shota, but this doesn't matter.
(I draw unisex characters more like shota)
March 7, 2025 at 5:35 PM
Not good if there is few reference images...
This time it's (probably) not shota, but this doesn't matter.
(I draw unisex characters more like shota)
This time it's (probably) not shota, but this doesn't matter.
(I draw unisex characters more like shota)
learning writing CMake files
running imgui examples
running imgui examples
March 7, 2025 at 5:28 PM
learning writing CMake files
running imgui examples
running imgui examples
colored sketch without lines
* Actually feel betther than outlined because I didn't draw the outline smoothly
* Actually feel betther than outlined because I didn't draw the outline smoothly
March 4, 2025 at 3:56 PM
colored sketch without lines
* Actually feel betther than outlined because I didn't draw the outline smoothly
* Actually feel betther than outlined because I didn't draw the outline smoothly
rkgk
應該不難猜出是什麼角色……！
還需要很多練習。臨摹參考了 BOOTH 上 Rusk 的圖像，不過沒有畫上 hoodie 上的圖案。
It should be easy to guess the character...!
I still need lots of practice. Tracing of image of Rusk on BOOTH, although I didn't draw patterns on the hoodie.
應該不難猜出是什麼角色……！
還需要很多練習。臨摹參考了 BOOTH 上 Rusk 的圖像，不過沒有畫上 hoodie 上的圖案。
It should be easy to guess the character...!
I still need lots of practice. Tracing of image of Rusk on BOOTH, although I didn't draw patterns on the hoodie.
February 27, 2025 at 2:15 AM
rkgk
應該不難猜出是什麼角色……！
還需要很多練習。臨摹參考了 BOOTH 上 Rusk 的圖像，不過沒有畫上 hoodie 上的圖案。
It should be easy to guess the character...!
I still need lots of practice. Tracing of image of Rusk on BOOTH, although I didn't draw patterns on the hoodie.
應該不難猜出是什麼角色……！
還需要很多練習。臨摹參考了 BOOTH 上 Rusk 的圖像，不過沒有畫上 hoodie 上的圖案。
It should be easy to guess the character...!
I still need lots of practice. Tracing of image of Rusk on BOOTH, although I didn't draw patterns on the hoodie.
I Added a 1 pole LPF, this reduced "ΔΣ-like noise" and overshoot.
Beautiful 12kHz Triangle & Square wave. The sample rate is set to 192kHz. They become worse at 96kHz sample rate, but it's reasonable because higher harmonics (>4th) will be filtered by DAC internal filter.
Beautiful 12kHz Triangle & Square wave. The sample rate is set to 192kHz. They become worse at 96kHz sample rate, but it's reasonable because higher harmonics (>4th) will be filtered by DAC internal filter.
February 21, 2025 at 5:18 PM
I Added a 1 pole LPF, this reduced "ΔΣ-like noise" and overshoot.
Beautiful 12kHz Triangle & Square wave. The sample rate is set to 192kHz. They become worse at 96kHz sample rate, but it's reasonable because higher harmonics (>4th) will be filtered by DAC internal filter.
Beautiful 12kHz Triangle & Square wave. The sample rate is set to 192kHz. They become worse at 96kHz sample rate, but it's reasonable because higher harmonics (>4th) will be filtered by DAC internal filter.