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Author Electronics people.
Tiger
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Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
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2nd Aug 13 at 11:24   View User's Profile U2U Member Reply With Quote
I need to simulate a 5-20w load on a 230v circuit, resisters I can find that will do 5w have a limiting voltage of 120v so that rules them out. The solution needs to be less than £5 per unit. It needs to be small, fitting in a 100mm x 100mm by 50mm box. I don't want it to generate much heat so that rules out a larger power resister.

Any links, options?

Cheers.

[Edited on 02-08-2013 by Tiger]
John
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Registered: 30th Jun 03
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2nd Aug 13 at 11:38   View User's Profile U2U Member Reply With Quote
My rudimentary calculations say about 8kohm for a 5ish watt load at 230v?

http://uk.farnell.com/te-connectivity-cgs/sbche68k2j/resistor-7w-5-8k2/dp/1174405

There look to be loads that would do the job though unless I'm missing something?

Is 100x100x50 a backbox type size? that's massive?
John
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Registered: 30th Jun 03
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2nd Aug 13 at 11:41   View User's Profile U2U Member Reply With Quote
Just realised that doesn't specify AC volts which might be the problem.
Tiger
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Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
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2nd Aug 13 at 11:44   View User's Profile U2U Member Reply With Quote
It's not a back box, it's an generic adaptable box.

That one looks fine though I'm concerned by the full power operating temp of 70'c, mind you it'll be a non continuous supply, on and off periodically for up to 5 minutes at a time.

Cheers John.
Tiger
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Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
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2nd Aug 13 at 11:47   View User's Profile U2U Member Reply With Quote
Looking at the description of applications, I imagine it'll be AC.
pow
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Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
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2nd Aug 13 at 13:19   View Garage View User's Profile U2U Member Reply With Quote
Try it, it'll soon go bang/pop the fuse in the plug/trip the RCD at the board if it's not meant for that
Tiger
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Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
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2nd Aug 13 at 14:00   View User's Profile U2U Member Reply With Quote
Spoke to Farnell, they won't have any stock til 18th November
Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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2nd Aug 13 at 17:11   View User's Profile U2U Member Reply With Quote
You just need to choose popular resistance values.

For example

5.29w load = 10k resistor with 0.023a current

11.25w load = 4.7k resistor with a 0.049a current


Suitable 10k for the 5w application

http://cpc.farnell.com/multicomp/mor07wj0103b09/resistor-7w-5-10k/dp/RE05160?in_merch=Products%20From%20This%20Range

Suitable 4.7k for the 10w application

http://cpc.farnell.com/welwyn/w24-4k7-ji/resistor-ww-14w-5-4k7/dp/RE06450?in_merch=Products%20From%20This%20Range

 
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