Author Topic: What's this please? (Component Advice)  (Read 389646 times)

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Offline capt bullshot

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Re: What's this please? (Component Advice)
« Reply #1450 on: October 22, 2018, 01:30:55 pm »
It has a National Semiconductor logo. They didn't have modern memory chips in such housings AFAIR, but it is maybe something like a LVDS / HDMI / SerDes chip. They also did a lot of custom chips for e.g. Tektronix.
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Offline MasterTech

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Re: What's this please? (Component Advice)
« Reply #1451 on: October 22, 2018, 01:41:50 pm »
This is the first time that the datecode actually is the product code  ;D

http://www.ti.com/lit/ds/symlink/lmx9830.pdf
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Offline djQUAN

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Re: What's this please? (Component Advice)
« Reply #1452 on: October 25, 2018, 03:47:22 pm »
Anyone know what this is? It is from a 3.3V fan motor PCB which was probably damaged by applying a higher supply voltage.
It appears to have an H bridge output since there is only 2 wires coming out of the windings (no center tap) and uses an external 4 pin hall effect sensor.
 

Offline mbest

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Re: What's this please? (Component Advice)
« Reply #1453 on: October 25, 2018, 08:14:10 pm »
Anyone know what this is? It is from a 3.3V fan motor PCB which was probably damaged by applying a higher supply voltage.
It appears to have an H bridge output since there is only 2 wires coming out of the windings (no center tap) and uses an external 4 pin hall effect sensor.

Maybe a 8-pin fan motor driver like BH6789FVM-TR

https://www.alldatasheet.com/view.jsp?Searchword=H678&sField=2
https://www.avnet.com/shop/us/products/rohm/bh6789fvm-tr-3074457345627114607?CMP=EMA_FindChips_inventoryfeed_VSE?aka_re=1
 
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Offline djQUAN

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Re: What's this please? (Component Advice)
« Reply #1454 on: October 26, 2018, 01:09:00 am »
Anyone know what this is? It is from a 3.3V fan motor PCB which was probably damaged by applying a higher supply voltage.
It appears to have an H bridge output since there is only 2 wires coming out of the windings (no center tap) and uses an external 4 pin hall effect sensor.

Maybe a 8-pin fan motor driver like BH6789FVM-TR

https://www.alldatasheet.com/view.jsp?Searchword=H678&sField=2
https://www.avnet.com/shop/us/products/rohm/bh6789fvm-tr-3074457345627114607?CMP=EMA_FindChips_inventoryfeed_VSE?aka_re=1

Pinout appears to match. I'll investigate further to double check. thanks! :-+

Edit: Lcsc.com has them for cheap. I'll just add some on my next order :)
« Last Edit: October 26, 2018, 01:32:24 am by djQUAN »
 
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Offline cdev

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Re: What's this please? (Component Advice)
« Reply #1455 on: November 06, 2018, 04:49:36 pm »
This piece of RF junk has been in my junk box for the longest time, and I would like to know what it is before I throw away something that I could use. Its potted in epoxy inside and kind of a black box for that reason. The leftmost connector measures 0.22 ohms from center to ground, so does the bottom middle one, while the rightmost SO-238 measures approximately twice that, 0.44 ohms at DC.

Left to center's center is 0.16 and right center to center's center is 0.25 approximately. Its tarnished so its not very accurate a measurement without using a PL-259 which I don't have handy, right here.

It's around 0.22 straight through. Because its potted I doubt if it is just a y-connector.

Does anybody know what it is?

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Online tautech

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Re: What's this please? (Component Advice)
« Reply #1456 on: November 06, 2018, 05:51:57 pm »
RF resistive splitter ?

Spectrum analyzer or VNA to confirm.
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Offline capt bullshot

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Re: What's this please? (Component Advice)
« Reply #1457 on: November 07, 2018, 06:21:37 am »
Might be some kind of transformer. You'd have to test it with some MHz of signal frequency to get useful results. VNA helps as tautech said, function gen and scope should also give some results.
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Offline nemm

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Re: What's this please? (Component Advice)
« Reply #1458 on: November 13, 2018, 05:09:16 am »
Maybe a dipol ballun?
 

Offline tsmith35

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Re: What's this please? (Component Advice)
« Reply #1459 on: January 01, 2019, 10:29:05 pm »
It's HM Electronics. They make intercom and audio systems.
 
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Offline orbiter

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Re: What's this please? (Component Advice)
« Reply #1460 on: January 06, 2019, 11:52:49 am »
Hi guys,

Could someone clarify as to whether I'm reading this resistor correctly please, the last yellow band is throwing me a bit. I can't test it as the resistor has gone open.

I've had a dig around and am thinking that it's just a 4 band 10Ω resistor with an extra 5th band denoting it's temperature coefficient. Would this be correct or not?   

Thanks guys 👍 


Online Nusa

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Re: What's this please? (Component Advice)
« Reply #1461 on: January 06, 2019, 12:32:31 pm »
Hi guys,

Could someone clarify as to whether I'm reading this resistor correctly please, the last yellow band is throwing me a bit. I can't test it as the resistor has gone open.

I've had a dig around and am thinking that it's just a 4 band 10Ω resistor with an extra 5th band denoting it's temperature coefficient. Would this be correct or not?   

Thanks guys 👍 



I think you're right about the nature of the bands, but not necessarily about the value. The 2nd and 3rd bands don't look the same color to me, but then I'm only looking at a picture plus my red-green vision isn't the best. If the 3rd band is actually green, that would be a 1MΩ resistor.

What was the application of the circuit in question? You may be able to determine what value makes more sense.
 

Offline madires

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Re: What's this please? (Component Advice)
« Reply #1462 on: January 06, 2019, 12:50:35 pm »
The 5th band could also indicate a fusible resistor (the color is vendor specific).
 
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Offline orbiter

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Re: What's this please? (Component Advice)
« Reply #1463 on: January 06, 2019, 01:01:19 pm »
Thanks guys..... I did actually consider it a fuse also as it has failed along with a TNY264GN (AC-DC Integrated Power MOSFET)

Both items are on a Neff dishwashers power in PCB.. As well as testing the PCB I'm also testing for shorts around the pump and heater element which also may have lead to these failures

Here are some hopefully helpful pics in ID'ing the resistor a little better?..



Online Nusa

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Re: What's this please? (Component Advice)
« Reply #1464 on: January 06, 2019, 01:55:16 pm »
Not 1M then. I found this page with what appears to be the same failure on the same board, which is apparently common to multiple brands/rebrands of dishwasher. Fusible resistor seems to be correct.

https://www.elektroda.pl/rtvforum/topic3147364.html
Readable if you run it through google translate or equivalent. Hope it helps you.
 
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Offline orbiter

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Re: What's this please? (Component Advice)
« Reply #1465 on: January 06, 2019, 02:10:30 pm »
Ah that's brilliant.. Ive got something to go on now.

Thanks a lot mate  :-+

Offline daqq

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Re: What's this please? (Component Advice)
« Reply #1466 on: January 10, 2019, 08:45:53 pm »
Believe it or not, pointy haired people do exist!
+++Divide By Cucumber Error. Please Reinstall Universe And Reboot +++
 

Offline helius

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Re: What's this please? (Component Advice)
« Reply #1467 on: January 10, 2019, 09:48:08 pm »
Appears to be a 1990s era water-cooled mainframe CPU assembly.
 

Online Richard Crowley

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Re: What's this please? (Component Advice)
« Reply #1468 on: January 18, 2019, 07:09:04 pm »
It is clear what this component is (Neutrik NTE1 transformer), so maybe this doesn't belong here.
But the question is regarding the schematic diagram for this transformer.
We know what the dots at the "top" of the primary and secondary winding mean.
But what does the dot in the middle of the secondary winding indicate? 
I don't remember ever seeing such a thing before.



Ref: https://www.neutrik.com/en/product/nte1
Context: https://en.toutlehautparleur.com/professional-audio-transformer-1-1-neutrik-nte1.html
 

Offline timelessbeing

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Re: What's this please? (Component Advice)
« Reply #1469 on: January 18, 2019, 07:43:23 pm »
bifilar winding?
 

Online Andy Watson

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Re: What's this please? (Component Advice)
« Reply #1470 on: January 18, 2019, 07:53:31 pm »
More likely that they cribbed that diagram from a transformer with a centre tap (like Neutrik NTE-10/3), but somebody forgot to remove the dot.
 
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Offline tsmith35

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Re: What's this please? (Component Advice)
« Reply #1471 on: January 22, 2019, 11:56:23 am »
Agreed. Similar image...
 
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Offline Ubernuton

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Re: What's this please? (Component Advice)
« Reply #1472 on: February 12, 2019, 04:55:22 am »
I don't suppose anyone knows what this is? I think I pulled it out of a brother printer (It also might have been a computer not 100% sure), but I have forgotten exactly where it was.
 

Online PA0PBZ

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Re: What's this please? (Component Advice)
« Reply #1473 on: February 12, 2019, 07:54:01 am »
I don't suppose anyone knows what this is? I think I pulled it out of a brother printer (It also might have been a computer not 100% sure), but I have forgotten exactly where it was.

High voltage transformer from a laser printer.
Keyboard error: Press F1 to continue.
 
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Offline radiorich

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Re: What's this please? (Component Advice)
« Reply #1474 on: February 17, 2019, 12:22:58 am »
Hello  orbiter ,
I think it's a great idea to have a What's this please
take me I been working with electronics since I was a kid also had run my own tv and radio repair shop since the mid 80s   
 


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