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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 16th Jan 2021, 5:45 pm   #21
DMcMahon
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Default Re: Can anyone tell me what this part is please?

My post above is not correct, I realise now that there is no hole in the mystery part for mounting to heatsink so it is not part I thought it was in the photos. From the photo in Post 1 I thought it was flat but now assume it must have curved back so must be the part designated as IC262 referenced by Radio Wrangler.

David
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Old 16th Jan 2021, 5:51 pm   #22
Outrun_uk
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Default Re: Can anyone tell me what this part is please?

Re-badged 2SA1033 maybe?
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Old 16th Jan 2021, 6:03 pm   #23
barrywebb
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Default Re: Can anyone tell me what this part is please?

Hi all the make and model are as follows .
Neostar NTCD1B the b at the end identifys it black NTCD1 i have look most everywhere and can't find anything on it at all.
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Old 16th Jan 2021, 6:12 pm   #24
ajgriff
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Default Re: Can anyone tell me what this part is please?

I think the chances of finding a schematic are pretty slim. Probably the only way to solve the mystery is to partially sketch out the circuit so that someone might be able to deduce the nature of the component.

Alan
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Old 17th Jan 2021, 7:14 am   #25
Robert Gribnau
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Default Re: Can anyone tell me what this part is please?

Maybe mailing Neostar could help? See: https://www.neostar-electronics.co.u...ontact_Us.html

I would mail them your pictures too and point out that the suspect part is "IC262". Maybe they can even send you the complete circuit board.
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Old 17th Jan 2021, 10:09 am   #26
barrywebb
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Default Re: Can anyone tell me what this part is please?

Hi I've done that twice and still no reply after over a week seems they are only interested in selling the junk.
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Old 19th Jan 2021, 9:19 am   #27
PJC58-Hythe
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Default Re: Can anyone tell me what this part is please?

I found this reference https://www.transistormosfet.com/tra...?search=MC1033 to MC1033 but this is an SOT-89 package.
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Old 19th Jan 2021, 9:53 am   #28
Nickthedentist
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Default Re: Can anyone tell me what this part is please?

How many outputs are there? Can you work out roughly what the voltages should be?

It might be easier powering it from a single wall-wart type supply and abandoning the inbuilt SMPS altogether.
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Old 19th Jan 2021, 9:55 am   #29
John_BS
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Default Re: Can anyone tell me what this part is please?

My initial guess was that it's a three-terminal low power regulator, but I hadn't realised there was so much going on under the board!. If so the 33 may refer to its nominal output voltage in stand-alone mode.



See attached for a similar device family.
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File Type: pdf HT1033.pdf (400.3 KB, 25 views)

Last edited by John_BS; 19th Jan 2021 at 10:01 am. Reason: second thoughts
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Old 19th Jan 2021, 10:23 am   #30
McMurdo
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Default Re: Can anyone tell me what this part is please?

I'd say the ic circuit ref. clinches it. I've seen many 3-leg ic's on far-eastern stuff marked as EBC.
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Old 19th Jan 2021, 12:15 pm   #31
Welsh Anorak
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Default Re: Can anyone tell me what this part is please?

I'm confused. There's apparently no mains reservoir capacitor and no chopper transformer. But it does look like a switch mode circuit of a sort. Is the mains transformer just that? If so what's all the circuitry on the 'hot' side of the circuit doing?
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