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Old 21st December 2009, 02:51 PM   #121
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Anyone have a spare C25 and C30, both are 10u 0805 SMD caps?

I might need these caps.
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Old 21st December 2009, 02:52 PM   #122
6h5c is offline 6h5c  Netherlands
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That would be red-yellow-brown-brown or red-yellow-black-black-brown, for a 1% four or five band resistor.

Ray
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Old 21st December 2009, 03:22 PM   #123
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Ok, I didn't need to know that. I know where they are located.

I'll pull them out tonight.
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Old 21st December 2009, 06:09 PM   #124
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Default ezdual

Got it working now!

I popped in 2x 100ohm resistors @ R3 & R5 and get +15.10 / -14.40 volts out.

I believe the resistors were within 5%. Should that do? Or should I get some resistors @ 1%?

Thanks,
JG
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Old 21st December 2009, 07:18 PM   #125
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I think I found my case...

HiFi Audio DIY Aluminum Chassis Aluminum Case - eBay (item 190353281526 end time Dec-27-09 07:38:50 PST)

20cm x 29.5 cm x 8cm internal dimensions.

I got to lay out my components and see if they'll fit.

I'd prefer to find something locally.
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Old 21st December 2009, 07:53 PM   #126
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That's great, just two resistors then. The voltage doesn't have to be exactly +/-15V, as long as it is >2.0V higher than the 12V output of the next regulator. 14.4V is a bit lowish, but the 4% tolerance of the LM337 and the 5% of the resistors could lead to 9% in total. If you want an exact voltage with LM317/337, it's better to use a trimmer instead of the 1k1.

The case looks good, but all the way from Hong Kong must mean $$$ shipping...

Ray
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Old 21st December 2009, 07:57 PM   #127
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Yeah, I'll have to find something a bit closer to home.
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Old 22nd December 2009, 03:34 PM   #128
paulb is offline paulb  Canada
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Quote:
Originally Posted by merlin2069er View Post
Yeah, I'll have to find something a bit closer to home.
These ones from Hammond (Guelph is pretty close to home, eh?) actually don't look too bad, though maybe not big enough if the power supply is in the same box.
Hammond Mfg. - Extruded Aluminum (Metal End Panels) - 1455 Series Enclosures

p.s. How's the weather there these days?
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Old 23rd December 2009, 02:43 PM   #129
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Quote:
Originally Posted by 6h5c View Post
That's great, just two resistors then. The voltage doesn't have to be exactly +/-15V, as long as it is >2.0V higher than the 12V output of the next regulator. 14.4V is a bit lowish, but the 4% tolerance of the LM337 and the 5% of the resistors could lead to 9% in total. If you want an exact voltage with LM317/337, it's better to use a trimmer instead of the 1k1.

The case looks good, but all the way from Hong Kong must mean $$$ shipping...

Ray
Should I use a couple of trimmers? I believe there 2x 1k1 on board.

I should use only the wiper and one end of the trimmer right?
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Old 23rd December 2009, 02:45 PM   #130
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Hmm, has anyone mounted their Ezdual? It's missing mounting holes
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