Author Topic: What's this please? (Component Advice)  (Read 1028574 times)

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Offline fkfaraz

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Re: What's this please? (Component Advice)
« Reply #1775 on: July 09, 2022, 12:46:09 pm »
Hello mariush thanks again for the reply

so i have an XGECU t56 programmer. i have disoldered the part and put it in it. Select AT24c512b@SOIC 8. Read it. There is seems to be data there.
Now a question
How could i know how much data is stored there. Like where it is written or i have to calculate it myself from the buffer
Thanks
 

Online mariush

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Re: What's this please? (Component Advice)
« Reply #1776 on: July 09, 2022, 01:21:21 pm »
Open the export using a hexadecimal viewer / editor  or use the viewer of the programmer to see the data

Empty / unused area will usually be full of either 0xFF or 0x00 bytes. 

So for example, if you see random bytes in the first 128 KB range and then everything is FF  bytes, there's a good chance the circuit or whatever used that eeprom reads and writes data only from the first 16 KB

See picture below, where I use HxD  (freeware hex editor / viewer) to open a random binary file ... it shows 16 bytes per line, and on the far left column it shows the offset in the file - the last fully visible line in the picture has offset  0x 0000 0200   or 200 in hexadecimal, which is 512 in decimal ... so if I see only FF or 00 from that point, I could assume only the first 512 bytes are used by the device or that it was actually a 512 byte eeprom chip and not a 64 Kbit (8 KB) chip.
 

Offline oz2cpu

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Re: What's this please? (Component Advice)
« Reply #1777 on: November 10, 2022, 10:23:08 am »
PLEASE HELP WITH HIGH VOLTAGE DIODE TYPE NUMBER

diameter 3mm
length of body 15mm
forward voltage 17V at 10mA
Color codes wide green = cathode
then a red ring
and then maybe a black ring on the black body, it is impossible to photo
but on some of them i feel like i can barely see it, but i am a bit unsure.
i got a very large bag of them, i can ofcourse measure the brake down voltage,
but i prefer to know real data and real type number,
any suggestions ?
more news 0.58pF and 58Meg ohm at zero volts
« Last Edit: November 10, 2022, 04:40:20 pm by oz2cpu »
Radioamateur OZ2CPU, Senior EE at Prevas
EMC RF SMPS SI PCB LAYOUT and all that stuff.
 

Online DC1MC

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Re: What's this please? (Component Advice)
« Reply #1778 on: November 10, 2022, 02:15:55 pm »
PLEASE HELP WITH HIGH VOLTAGE DIODE TYPE NUMBER

diameter 3mm
length of body 15mm
forward voltage 17V at 10mA
Color codes wide green = cathode
...

Candidate: https://www.hvproducts.de/axial_lead_low_current_high_voltage_diodes
Could be those guys: https://www.hvproducts.de/gfs_series_high_voltage_diodes

or these:
http://hvp.kr/uploaded/category/data_2CL2_HV37_UX_Series_page_8.pdf

cheers,
DC1MC
 
The following users thanked this post: oz2cpu

Offline oz2cpu

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Re: What's this please? (Component Advice)
« Reply #1779 on: November 10, 2022, 04:31:54 pm »
73 DL1MC thanks a lot for your time and help
none of the suggested diodes matches the size of my diode type.
more news i measured 0.58pF and 58Meg ohm at zero volts
« Last Edit: November 10, 2022, 04:57:33 pm by oz2cpu »
Radioamateur OZ2CPU, Senior EE at Prevas
EMC RF SMPS SI PCB LAYOUT and all that stuff.
 

Offline kolbep

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ST BEV C426
« Reply #1780 on: November 26, 2022, 11:07:10 am »
Hi All
Repairing an Industrial PC Powersupply.
This Component has gone short circuit. It is in Parallel with several electrolytic caps, so I presume it is a cap.
I have not tried to power it up without this, as I don't want it to cause any more damage if it is essential.
I have searched on ST, and on google, but cannot find it.

Any suggestions / what it is?

[attachimg=1]
[attachimg=2]
[attachimg=3]
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www.ShoutingElectronics.com Don't just talk about Electronics, SHOUT ABOUT IT! Electronics Blog Site and Youtube Channel
 

Offline gamalot

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Re: ST BEV C426
« Reply #1781 on: November 26, 2022, 11:34:36 am »
Hi All
Repairing an Industrial PC Powersupply.
This Component has gone short circuit. It is in Parallel with several electrolytic caps, so I presume it is a cap.
I have not tried to power it up without this, as I don't want it to cause any more damage if it is essential.
I have searched on ST, and on google, but cannot find it.

Any suggestions / what it is?

[attachimg=1]
[attachimg=2]
[attachimg=3]

Looks like SM15T36CA : https://www.st.com/resource/en/datasheet/sm15t36ca.pdf

Offline kolbep

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Re: What's this please? (Component Advice)
« Reply #1782 on: November 26, 2022, 03:56:31 pm »
Thank you.
That looks like what it is. It is starting up without the ESD Protection.
I will order a replacement shortly.

Peter
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