Cascade Kobayashi @cascade.moe · 15/05/2025Completed soldering of my CS4398-REV2 board, looks not bad after cleansing. 070
Cascade Kobayashi @cascade.moe · 07/05/2025腦電感應是不是一種對大腦的、基於電磁輻射洩露的側信道攻擊？ Is brain sensing a type of side-channel attack on the brain, based on electromagnetic radiation? 160
Cascade Kobayashi @cascade.moe · 29/04/2025@raysky-rt.bsky.social さんのイラストです！ 是自己 OC （或者說是自設）的插畫。 An illustration of my OC by RaySky. 0102
Cascade Kobayashi @cascade.moe · 07/04/2025some 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 050
Cascade Kobayashi @cascade.moe · 03/04/2025WIP 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. 020
Cascade Kobayashi @cascade.moe · 02/04/2025WIP 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. 140
Cascade Kobayashi @cascade.moe · 31/03/20253rd 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。 050
Cascade Kobayashi @cascade.moe · 29/03/2025DAWN 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. 070
Cascade Kobayashi @cascade.moe · 29/03/2025Tested 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) 041
Cascade Kobayashi @cascade.moe · 27/03/2025From 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. 040
Cascade Kobayashi @cascade.moe · 20/03/2025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 040
Cascade Kobayashi @cascade.moe · 18/03/2025親友們說想看我 cos M200。 沒玩過 Girls' Frontline，但大概還是略有了解。 只是感覺自己的外貌過不了自己這一關呢。 My friends wanted to see me cosplay M200. Although I never played Girls' Frontline, I know some of it. I just don't think I'll look good enough to satisfy myself. 0100
Reposted by Cascade KobayashiYu-dachi @yu-dachi.bsky.social · 18/03/2025このうちの子ほんまお気に入り #art #oc 514123
Cascade Kobayashi @cascade.moe · 17/03/2025Nia-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。 1100
Cascade Kobayashi @cascade.moe · 15/03/2025AI assisted coding/designing are hyped I do coding, designing & sometimes illustrating. It's just like people thinking AI will replace people like me soon, that's sick. 150
Reposted by Cascade KobayashiYu-dachi @yu-dachi.bsky.social · 15/03/2025昔描いたアスナ #ブルアカ #bluearchive 513736
Reposted by Cascade KobayashiCasey Newton @caseynewton.bsky.social · 12/03/2025Visiting friends in New York 59247702752
Cascade Kobayashi @cascade.moe · 11/03/2025Good 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 060
Cascade Kobayashi @cascade.moe · 09/03/2025Seem to got cold + fever... Body temperature (armpit) measured 37.4 °C yesterday afternoon and I took some medicine. Now it is 37.6 °C now... 好像感冒+發燒了… 昨天測腋下體溫 37.4 °C，我吃了點藥。現在體溫是 37.6 °C 了。 150
Cascade Kobayashi @cascade.moe · 07/03/2025Not 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) 1100
Cascade Kobayashi @cascade.moe · 04/03/2025colored sketch without lines * Actually feel betther than outlined because I didn't draw the outline smoothly 060
Cascade Kobayashi @cascade.moe · 01/03/2025bilibili-live-danmaku-cli 版本更新 v0.2.2 現在可以支援從 Firefox 的 cookie 資料庫中自動讀取 SESSDATA，不再需要手動指定 SESSDATA 了。 github.com/Isoheptane/b...github.comRelease v0.2.2 · Isoheptane/bilibili-live-danmaku-cliv0.2.2 release New Feature: Read SESSDATA from Firefox cookies database 新增功能： 從 Firefox cookies 資料庫中讀取 SESSDATA 090
Cascade Kobayashi @cascade.moe · 27/02/2025rkgk 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. 071
Cascade Kobayashi @cascade.moe · 21/02/2025I 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. 040
Cascade Kobayashi @cascade.moe · 21/02/2025So, I also need a LPF to filter out these "Delta Sigma" like noises... CS4398 Datasheet specified a 2 pole LPF. Now I know why this exists in their datasheet... I kept the pads on my board so I can still achieve a 1 pole LPF, but I don't know whether it is enough... 040
Cascade Kobayashi @cascade.moe · 20/02/2025I managed to get the DAC working, although the headphone amplifier is off... There is a huge LPF on my computer onboard audio output. The waveform will completely become a sinewave after 12kHz. My CS4398 DAC peforms better at 96kHz. Pics are the waveforms of 4kHz square wave. 040
Cascade Kobayashi @cascade.moe · 18/02/2025So I can't get into communication with CS4398 with I2C, I can't even get it working in standalone mode and I don't know why... It's even more annoying that I don't have equipments like oscilloscope and rework station in my dorm, so I don't have the chance to fix it up here... 030
Cascade Kobayashi @cascade.moe · 17/02/2025USB 3.1 Hub Recognized! Working well with external supply. Also possible to work on host supply but need to connect external supply first (there are some issues with power path management). 070
Cascade Kobayashi @cascade.moe · 17/02/2025USB 3.0 Hub I fixed the power supply part and now USB 2.0 is working. I will test USB 3.0 later. 030
Cascade Kobayashi @cascade.moe · 16/02/2025Finished my CS4398-DAC Board after 4 hours of work. Haven't tested power supplies yet but STM32 should be working normally. 071
Cascade Kobayashi @cascade.moe · 13/02/2025The best way to advance skills is actual project experience. I have been doing some projects like my audio DAC, and I also asked professionals for advices. This experience of "doing a project" will force you to solve or avoid problems. 020
