Author Topic: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia  (Read 2020 times)

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Offline Lorenzo_1

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Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« on: August 31, 2017, 01:13:38 pm »
Hi. I need one of these for the primary side of a LeCroy power supply. Been looking at RS Components, Radio Parts and Element-14/Farnell without success. I think the one installed is perhaps metal oxide/flameproof type - green body & matt finish.  From the size I think 2W (it's 9mm x 3mm in the body) Any suggestions?  I can find them online in US/Canada but postage is high.  Also ex China/Hong Kong with free postage but unknown quality.  Grateful tips as to what to avoid/prefer.
 

Offline Rbastler

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Re: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« Reply #1 on: August 31, 2017, 02:05:57 pm »
You could use two 1.5M in parallel, say 1W each, if there is enough space.

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Offline David_AVD

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Re: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« Reply #2 on: August 31, 2017, 09:16:48 pm »
How much of a hurry are you in and where are you located?

Digikey has 750K 2W ones and I could add a couple to my next order.
 

Online xavier60

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Re: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« Reply #3 on: August 31, 2017, 10:24:28 pm »
Over the years I have had trouble finding resistors that are reliable at high voltages. I take notice of a resistor's voltage rating instead of just its wattage. In recent years I have been using High Voltage Thick Film Resistors, usually Welwyn brand.
« Last Edit: August 31, 2017, 10:38:22 pm by xavier60 »
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Offline Lorenzo_1

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Re: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« Reply #4 on: September 01, 2017, 11:38:04 pm »
Thks for the replies.  I'm not in a great hurry as the PS is currently working fine with 2x1W 1.5M carbon composition resistors in parallel (all I could get locally) - Cairns is not an easy place to do these sorts of repairs as Jaycar's about the only supplier.  Before deciding whether to take up  David_AVD's kind offer, I could use some advice on what's recommended for primary side of this SMPS.  The dead one I removed is 9mm x 3mm and matt light green finish - sits across 340V DC rail behind bridge rectifier with primary side ground at 170VDC (schematic & photo attached).  I've taken it to be 1W and presumed it should be capable of handling at least 200V. 

I figured it might be metal oxide type - hence I was looking for those.  Would an HV thick film resistor substitute OK or should I stick closer to a like-for-like replacement?  Are there generic recommendations for appropriate composition of this type of SMPS resistor? I presume some fire/transient resistant type is recommended - does it matter if you put in something with kV volt rating if that's readily available here? 

For David_AVD - perhaps you can PM me to advise when you'd need a decision from me about adding one/some to your next order.



 

Offline David_AVD

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Re: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« Reply #5 on: September 02, 2017, 03:07:06 am »
I order from Digikey or Mouser every week or two, so give me a yell when you need them.  Should be able to pop them in an envelope so only a couple of bucks all up.
 

Offline Lorenzo_1

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Re: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« Reply #6 on: September 02, 2017, 09:54:07 am »
Thanks David. Will do. I'll PM you if that's OK.
 

Offline David_AVD

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Re: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« Reply #7 on: September 02, 2017, 11:25:03 am »
No problem.
 

Offline David_AVD

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Re: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« Reply #8 on: September 13, 2017, 05:06:49 am »
I have your resistors ready to send.  Just need to double check address and give you PayPal details.
 

Offline Lorenzo_1

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Re: Where to buy 750kOhm 2W metal oxide(?) resistor in Australia
« Reply #9 on: September 13, 2017, 10:04:34 am »
Thks David.  I've PM'd you.
 


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