Recent Posts

Pages: [1] 2 3 4 5 6 ... 10 Next
1
Indeed.
I did some simulation with AD8628 and is not so clean with this circuit. Current noise even gets worst with bigger C20.
ADA4522 I think is still the best bet.
Other issues will solve after op-amp.

2
Huh? It's the exact opposite situation to a long thin soldering iron tip.

What I'm saying is there could be more of a temperature drop when using a long thin tip compared to this.

Assuming the slip fit or however its connected is decent.
3
In the case of Olimex the "product" is a "kit", which arrives in the form of a box of components to assemble, therefore it's not even the "kit" of a "finished laptop" but rather of a "laptop in development", that is, a "development board inserted into the shell of a laptop computer".

does making it a "kit" avoid the paperwork of getting approvals?
4
Test Equipment / Re: Siglent SDS2000X Plus
« Last post by tautech on Today at 08:31:43 pm »
So what am I doing wrong here in this picture? I'm trying to hack a DVD player's VFD display, and I'm looking at the I2C pins off the EEPROM, between the main IC, and the VFD MCU.

The Green trace is the SCL line, and blue is data. I didn't see any decoding happening, so I copied most of your settings, I'm on 10bit mode but I think I have the same trigger settings. It let's me choose which CH is SCL or SDA. I've tried serial triggering, and didn't get that to do much either. I've tired rising and falling edge triggers.

In 2 pic's I was triggering off SDA to get a better pic of SDA.

In the Utility settings, it still says I have 30 free uses of I2C left. So what am I missing here ? I've had I2C work on my sds1204X-E, I can try that too, I've had that work before.

But this is the 2nd time I tried I2C on the SDS2204Xplus, and not seem to get any thing. Do I have some other setting wrong or not activated ? All clues to me say that these really are the I2C pins, and not SPI, etc. I only have parts of the DVD player, so IDK what the IC is really sending, but it repeats, until it goes back to sleep or whatever.
Hmmm
IMO you don't have a Clk, only CS.
Try setting up with just data and CS.

If needed I can show screenshots using CS.
5
Test Equipment / Re: SDS800X HD Bugs/Wanted Features
« Last post by eTobey on Today at 08:28:58 pm »
Even if you don't understand what is somehow roughly explained here in Finnish...

Thank you for this piece of knowledge.  :-+ Did you write this?

Too bad, that this value cant be changed. Can it be changed on the expensive ones?
6
Hi and thanks for the reply,

Sorry I should have stated that I  am aware of that I can purchase the original cable, but thank you for helping.

I was mostly curious since it seems to be a great power connector and would come in handy for other projects.

Thank you for the comment regarding shaver power connectors. It seems to be as correct  :-+
7
Thermal Imaging / HTI HT-203U Thermal Imager Raspberry Pi OS
« Last post by 5B4APV on Today at 08:25:44 pm »
Hello!

I am trying to view the UVC video stream of the HT-203U 256x192 USB C thermal camera on raspberry pi os but I haven't been able to.
I have tried through VLC, guvcview, cheese and ffmpeg

The thermal imager works fine as a webcam on Windows, but on Pi os it wont display anything and each software prints errors when trying to connect to it.

The format that works on windows is YUYV422 256x192

Any guidance on how to view live video from this device will be greatly appreciated.

Bellow are the outputs of 2 commands that show the details of the video stream the device outputs.


ffmpeg -f v4l2 -list_formats all -i /dev/video0:

[video4linux2,v4l2 @ 0x1907cd0] Raw       :     yuyv422 :           YUYV 4:2:2 : 256x392 256x192 256x196 256x400 256x196 256x200 192x520 192x400
[video4linux2,v4l2 @ 0x1907cd0] Compressed:       mjpeg :          Motion-JPEG : 120x160 240x320 640x360
[video4linux2,v4l2 @ 0x1907cd0] Compressed:        h264 :                H.264 : 240x320


v4l2-ctl -d /dev/video0 --list-formats:

ioctl: VIDIOC_ENUM_FMT
        Type: Video Capture

       
  • : 'YUYV' (YUYV 4:2:2)
  • [1]: 'MJPG' (Motion-JPEG, compressed)
            [2]: 'H264' (H.264, compressed)
8
Repair / Re: Maxon PM100 PMR EEPROM
« Last post by bingo600 on Today at 08:25:26 pm »
Just an idea ...

This
http://radiomanual.info/schemi/Surplus_Civil/Maxon_PM-100_SM-2000_serv_G3VFP_1998.pdf

Points to this PLL Chip
https://www.nxp.com/docs/en/data-sheet/MC145191.pdf

That chip seems to have 3 registers taking :

REGC : 8bit
REGA : 24bit
REGR : 16bit

That gives 48bits ==> 6 bytes

That Rings a bell here ... Same length as your channel data

/Bingo

9
General Technical Chat / Re: Custom "R-core" transformers on ebay
« Last post by jonpaul on Today at 08:20:40 pm »
RLC high = hot termina (RED)  of RLC bridge or meter

RLC low = rtn terminal (BLK) of RLC brige  meter
10
For reference, here's the definitive list of 440mA and 11A multimeter fuses I compiled a while back. These are the ones that are exact equivalents to the ones used in Fluke, Keysight, and other reputable meters. (ESKA doesn't make 440mA and 11A multimeter fuses.) In particular, these are all proper 10.3x35mm size on the 440mA.

When searching for DMM fuses, I found that the prices varied insanely, especially if you look for just one specific brand.

So look for all the possible parts. At least one of them will be affordable.

440mA:
* Fluke 943121
* Bussmann DMM-B-44/100
* Littelfuse FLU .440 (0FLU.440T, 0FLU.440M)
* SIBA URZ series, part # 210 06.0.44

11A:
* Fluke 803293
* Bussmann DMM-B-11A
* Littelfuse FLU 011. (0FLU011.T, 0FLU011.M)
* SIBA URZ series, part # 50 199 06.11
Pages: [1] 2 3 4 5 6 ... 10 Next