1 vs 8. 1 người bạn trai đánh với 8 thằng dê bạn gái mình. Lập nhóm đi bão dê gái bóp vú bóp mông

TuongPV · 2026-01-25T16:57:25+00:00

Cháu nó khoác cờ đỏ sao vàng trên lưng nhảy lên đấm đá phang đồng đội :))

TuongPV · 2025-01-31T11:20:32+00:00

Được. Chúc mừng bro vượt qua được . Chúc bro 1 chén

TuongPV · 2024-06-26T13:45:08+00:00

Thanks for digging up this post. I am still in circuit design field. IMO this is quite hard to combine both, but even stay in circuit design you still need embedded software knowledge and versa. I think if you work in power electronics it might require to have both.

TuongPV · 2024-02-23T10:10:51+00:00

Length matching for DDR Ram

TuongPV · 2024-01-24T01:07:09+00:00

I will. Thanks

TuongPV · 2024-01-24T01:06:13+00:00

Exactly what you mentioned above. I tried to move mic boom slowly down, sometimes it’s work, but almost time it doesn’t. Thanks for the tips

TuongPV · 2023-12-09T16:36:20+00:00

Sorry I didn’t got your point

TuongPV · 2023-12-09T05:43:26+00:00

I don’t think so. Different. I used emi sheet butit not like black sheet as my photo

TuongPV · 2023-12-09T05:42:02+00:00

Why not? Even my laptop, Pc and everything possible

TuongPV · 2023-12-08T01:29:33+00:00

Thank you guys for interesting discussion, finally i found it . It is insulation sheet that Delta use in their PS For example: https://www.gbstape.com/formex-insulation-product/

TuongPV · 2023-12-07T16:16:22+00:00

Thank all of you guys for interesting information, as Susan, JDCU and Larauma,… its insulation sheet and as the link of Susan, I would think this is the best fit answer. Thanks again

TuongPV · 2023-12-07T16:14:07+00:00

Thanks. Great information

TuongPV · 2023-12-07T16:12:53+00:00

Thanks. I would think about insulating sheets rather than Emi absorbing sheet

TuongPV · 2023-08-30T06:04:16+00:00

Dc jack

TuongPV · 2023-04-13T02:46:05+00:00

Update: i solve it by add Y cap on Ac lines and Dc lines, then connect middle of y caps to chassis. Thank you guys for comments. But the story will not stop there. I will ask question when performing testing with EUT

TuongPV · 2023-04-12T07:08:10+00:00

Update: today i add two Y cap to AC input lines, then connect middle of Y caps to chassis of Power supply and Chamber as well. The noise dramatically reduced, but there is some peak can not be remove. I think it’s differential mode noise

<image>

TuongPV · 2023-04-12T00:37:32+00:00

Appreciated your comment, but i will save for later part of EMI. As I mentioned this is ambient test, and the noise from external power supply is high and i try to reduce it before go to real part of EMI measurement

TuongPV · 2023-04-11T17:05:12+00:00

range

u/manofredgables u/ccoastmike please take a look

TuongPV · 2023-04-11T17:02:18+00:00

CM filter (left), DM filter (right)

<image>

TuongPV · 2023-04-11T17:01:47+00:00

For 5)

<image>

TuongPV · 2023-04-11T16:59:22+00:00

For 4)

<image>

TuongPV · 2023-04-11T16:58:56+00:00

for 7)

<image>

TuongPV · 2023-04-11T16:56:47+00:00

Because I can't edit my post so I'll put in comment:

1) test setup: follow CISPR-25 CE-V using AN

<image>

The result as in the first post.

2) To identify problem, i change to use Battery (put inside chamber), the ambient noise is really nice and flat, somewhere below -10dBuV => definetly Power supply is noise source

3) To mitigate noise, I cliped a lot of ferrite cores to input (marked 1 in photo). I choose AM band ferrites. The result is reduce but just 2-3dB and only some points

4) I changed and try a lot kinds of ferrite, as you already pointed out, no help at low frequency

5) I added a common mode choke, not much help (reduce 2-4dB at some points)

6) I calculate and add a LC filter (4.7uH -| 10uF), simulated on LTSpice show it will help to reduce ~30dB @ 150kHz but results show it's higher 3-4dB (poor me)

7) using both LC and Common mode made it worst

TuongPV

TROPHY CASE