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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 13th Jan 2021, 6:41 pm   #1
barrywebb
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Default Can anyone tell me what this part is please?

The part is off of a power supply unit I test kid as dead but I might be wrong as u can't identify it looks like a transistor but not sure it part number is MC1033 followed by 1303SJ any help would be most helpful see picture.
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Old 13th Jan 2021, 6:54 pm   #2
stevehertz
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Default Re: Can anyone tell me what this parts is please

It's a digital temperature sensor:

https://www.datasheetarchive.com/MC1033-datasheet.html

Anything like that, just google what it says.
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Old 14th Jan 2021, 4:01 pm   #3
Robert Gribnau
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Default Re: Can anyone tell me what this parts is please

The link leads to datasheets for an EMC1033 temperature sensor (with 8 leads) and to a MC1033 Dual R-S Flip-Flop (with 14 leads?). They do not look like the part in Barry's picture.
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Old 15th Jan 2021, 10:57 am   #4
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Default Re: Can anyone tell me what this parts is please

Thank you for that know one seems to no what it is but it's not that link I was sent.
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Old 15th Jan 2021, 11:25 am   #5
Herald1360
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Default Re: Can anyone tell me what this parts is please

Maybe a plastic case variant of 2SC1033?

https://alltransistors.com/transisto...ansistor=11338
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Old 15th Jan 2021, 11:40 am   #6
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Default Re: Can anyone tell me what this parts is please

Bearing in mind the application (PSU) I wonder if it's a low power voltage regulator. The attached datasheet is for an SC1033. Perhaps another maufacturer made one with the designation MC. A real long shot I know.

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Old 15th Jan 2021, 1:29 pm   #7
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Default Re: Can anyone tell me what this part is please?

I have attached a link to semiconductor manufacturers logos site. If you can find out who made it it should be possible to identify the device. Happy searching.

https://how-to.fandom.com/wiki/How_t...heir_logos/A-E

Al
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Old 15th Jan 2021, 3:07 pm   #8
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Default Re: Can anyone tell me what this part is please?

That's a very useful link Al and I've bookmarked it for future reference. I may have missed it but didn't manage spot a logo like the one on Barry's mystery component.

Alan
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Old 15th Jan 2021, 3:42 pm   #9
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Default Re: Can anyone tell me what this part is please?

I too looked for that logo, it's not there.
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Old 16th Jan 2021, 1:39 am   #10
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Default Re: Can anyone tell me what this part is please?

So it's definitely not a digital temperature sensor !

Hmmm, I like a mystery, can you give us a bit more context about the circuit it has come from, perhaps a little sketched diagram if possible?
That will certainly help.

Steve.
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Old 16th Jan 2021, 1:02 pm   #11
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Default Re: Can anyone tell me what this part is please?

Hi thanks for helping in with this it's a mystery.
Here are some pictures with it on the board.
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Old 16th Jan 2021, 1:16 pm   #12
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Default Re: Can anyone tell me what this part is please?

The fact that the screenprinting identifies two of the leadouts as E and C tells us that it's a bipolar(?) transistor of some kind.

The fact that it's on the secondary, mains-isolated side of the supply (I think) probably means that it's acting as some kind of series regulator.

But where is the chopper transformer? I'm confused.

N.

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Old 16th Jan 2021, 1:21 pm   #13
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Default Re: Can anyone tell me what this part is please?

What's the circuit board fitted to? Service info may be available.
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Old 16th Jan 2021, 1:43 pm   #14
barrywebb
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Default Re: Can anyone tell me what this part is please?

Hi all there is a Transformer that goes to the board the transformer is working fine but when I connect it to the board the voltages go down from 16v down to only 5v when I remove that mystery part the voltage in stays at 16v.
The power supply is fitted to a Chinese 3in1 record player.
Barry
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Old 16th Jan 2021, 1:59 pm   #15
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Default Re: Can anyone tell me what this part is please?

The component designator printed on the board for the mystery part is 'IC262'
Nearby it is a power device labelled 'Q266'

This implies that whoever drew the circuit diagram and material list saw the mystery part as an IC and not as a transistor.

An SMPS with the transformer away from the PCB must radiate quite efficiently, and I see the trad removal of EMC filter components has been carried out.

David
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Old 16th Jan 2021, 2:24 pm   #16
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Default Re: Can anyone tell me what this part is please?

Quote:
Originally Posted by Radio Wrangler View Post
This implies that whoever drew the circuit diagram and material list saw the mystery part as an IC and not as a transistor.
Presumably the same individual also labelled the mystery component's lead outs as EBC. Very confusing!

Alan
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Old 16th Jan 2021, 2:39 pm   #17
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Default Re: Can anyone tell me what this part is please?

Quote:
Originally Posted by Nickthedentist View Post
The fact that the screenprinting identifies two of the leadouts as E and C tells us that it's a bipolar(?) transistor of some kind.

The fact that it's on the secondary, mains-isolated side of the supply (I think) probably means that it's acting as some kind of series regulator.

But where is the chopper transformer? I'm confused.

N.
Ignore what I said, looking at the wrong part
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Old 16th Jan 2021, 4:08 pm   #18
Robert Gribnau
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Default Re: Can anyone tell me what this part is please?

Barry, what is the brand and model of your player? Like Graham already remarked: Maybe there is a service manual for it which contains a parts list. Or maybe the brand used their own way of coding parts.
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Old 16th Jan 2021, 5:25 pm   #19
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Default Re: Can anyone tell me what this parts is please

Quote:
Originally Posted by Robert Gribnau View Post
The link leads to datasheets for an EMC1033 temperature sensor (with 8 leads) and to a MC1033 Dual R-S Flip-Flop (with 14 leads?). They do not look like the part in Barry's picture.
Yes this is one of those annoying data sheet search results where the top results found are not what you want but include MC1033 in their description, i.e. EMC1033 so quite easy initially to think you have found the correct data sheet but it is totally incorrect, I have been down this path myself before with similar.

Also further down the search results there is MC 1003 but not the right part in this case.

David
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Old 16th Jan 2021, 5:33 pm   #20
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Default Re: Can anyone tell me what this parts is please

Quote:
Originally Posted by ajgriff View Post
Bearing in mind the application (PSU) I wonder if it's a low power voltage regulator. The attached datasheet is for an SC1033. Perhaps another maufacturer made one with the designation MC. A real long shot I know.

Alan
From the photo my first thought was voltage regulator but the transistor E/C/B leg designations obviously do not tie up with that ?

David
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