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Old 17th January 2008, 01:21 AM   #1
CBS240 is offline CBS240  United States
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Question Power resistors

Hi

Has anyone here ever used these power resistors from Caddock Electronics? They are metal film resistors, but also seem cheap for the power. They would be more versitile for different power sizes depending on heat sink size and boad space.
I was thinking of dropping some in the latest amp I'm making. Does anyone have any thoughts on the notion of using the MP915 (TO-126) as source/emitter resistors for a power output stage? A heatsink would probably not be needed here. Maybe a little pricey for that purpose, but they would look kool.
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Old 17th January 2008, 01:23 AM   #2
poobah is offline poobah  United States
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I have used LOTS of Caddock resistors...

Cool people... cool stuff... go for it...

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Old 17th January 2008, 01:27 AM   #3
CBS240 is offline CBS240  United States
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Sweet!!!Click the image to open in full size.


I am designing that section of the PCB, so now is the time to decide. Thanks for the reply poobah!


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Old 17th January 2008, 01:45 AM   #4
poobah is offline poobah  United States
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What I want to know is...

Where did you get the rowdy jumping happy guys????

Poo
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Old 17th January 2008, 02:13 AM   #5
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I've used both the MP915s and MP930s out of that series. Caddock gets a thumbs-up from me. They mount well to heatsinks should you want to go beyond a watt or two of free-air dissipation.

Grey
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Old 17th January 2008, 03:00 AM   #6
gootee is offline gootee  United States
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I really like the Caddock power resistors, too. I have used a lot of the TO-220 MP930 series, mainly the 10, 50, and 100 Ohm models, as current-limiting resistors in my multi-frequency curve tracer product.

The TO-126 and TO-220 case sizes, with their relatively close lead-spacing, seem like they should also contribute to them having the lowest-possible inductance. And they definitely made my board layout better.

I usually buy them through mouser.com, in qty 10 or more. Does anyone happen to know of a significantly-cheaper source?
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Old 17th January 2008, 05:28 AM   #7
CBS240 is offline CBS240  United States
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Thanks for the feedback guys, I plan to use the MP915's as output source resistors. I had to create the part profile in Eagle, but that wasn't too difficult. Your right, they do make the layout better.

Quote:
Originally posted by poobah
What I want to know is...

Where did you get the rowdy jumping happy guys????

Poo

SShhhh it's a secret......


no really, just quote post 3, and copy the image URL......

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Old 17th January 2008, 07:54 AM   #8
Nordic is offline Nordic  South Africa
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You have a cheap supply of them?... I have been put off the hectic pricetag for those on the RS site .
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Old 17th January 2008, 02:07 PM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by Nordic
.. cheap supply of them?... I
of the rowdy jumping happy guys/gals? or something else?
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Old 17th January 2008, 06:43 PM   #10
CBS240 is offline CBS240  United States
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I believe Nordic is referring to the Caddock resistors. I plan to get them from Mouser along with the other stuff. Your right, they aren't cheap at a few bones each for the values I need in MP915 style (TO-126). I guess if I'm going to use 3 THAT 340 arrays at over 7 each in the circuit, 4 of these resistors isn't too bad relatively. I don't intend to build the cheapest amp possible anyway.... Still they're a small expense compared to the rest of the hardware (power supply, case, heat sinks, ect.)
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