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Old 22nd December 2009, 08:41 PM   #41
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Originally Posted by DougL View Post
Motor run capacitors are designed to have very low ESR, and when used as the last cap in the power supply can lower the power supply impedance. Its your job to decide where their advantages outweigh the cost and size penalties. Isn't DIY grand?
Hi,
How can we identify motor run versus motor start capacitors. My surplus store is not very descriptive on what is in the box. Is there a way to tell which is which?

Thanks
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Old 22nd December 2009, 11:40 PM   #42
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Quote:
How can we identify motor run versus motor start capacitors.
It is not always possible without seeing the original manufacturers description. If you can get the manufacturers part number, maybe Google can help. I can offer one hint. Avoid any cap in a plastic can. All of the good ones that I have seen are aluminum. Many motor start caps come in a black plastic housing.
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Old 23rd December 2009, 07:06 PM   #43
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Hi,
I want to know more about transformer orientation. How can I avoid problems with transfo-transo and transfo tube interference? My layout is not completely done, so I try to avoid problem, not to patch some, yet

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Old 4th January 2010, 02:45 AM   #44
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Hi,
What is the best output transformer orientation (A, B, C or D)?

What is the best power transformer orientation (i, ii, iii, iv)?

Do not worry to talk about combination (e.g. A and ii).

A: Click the image to open in full size.

B: Click the image to open in full size.

C: Click the image to open in full size.

D: Click the image to open in full size.

i: Click the image to open in full size.

ii: Click the image to open in full size.

iii: Click the image to open in full size.

iv: Click the image to open in full size.

P.S. Do not worry, I will put the power transformer upside down when I will fix it
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Old 4th January 2010, 02:57 AM   #45
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I have never seen OPT's interfere with each other. I have seen the power transformer and the OPT's fail to get along with each other. You want thier cores at 90 degree angles from each other. So I would choose option i or iv. Use iv if you ever want to sdd a choke later, and put it behind the power transformer
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Old 7th January 2010, 10:40 PM   #46
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Default Rk

Hi,
How critical is the Rk value:
-match between left and right
-match with the expected value of 560ohm.

The reason I ask is that my 560ohm 5w measure a bit lower and the match left-right is not perfect. Is this critical?

I will use el34 with a edcor XPW035 ( 120Vrms, 60Hz. 740V(370-0-370)@200mA, 6.3V(3.15-0-3.15)@5A & 5V@2A)

The answer is probably here, but I don't know how to interpret the table.
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Old 8th January 2010, 04:18 AM   #47
rknize is offline rknize  United States
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It's not the critical. The tubes themselves won't be matched that well either.
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Old 10th January 2010, 07:09 AM   #48
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Default Value of C1, C2, C12 & C22 critical?

hi,
pardon for hijacking this thread.

Recommended C1 = 47uf/500V, C2 = 120uf/500V & C12 = C22 = 1500uf/50V.
Am i also able to use C1 = 100uf/500V, C2 = 220uf/500V & C12 = C22 = 2200uF/63V?

Thanks.
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Old 10th January 2010, 08:27 PM   #49
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Those are fine except for C1. If you are using a tube rectifier especially, you really shouldn't exceed 47uF.
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Old 10th January 2010, 08:49 PM   #50
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Those are fine except for C1. If you are using a tube rectifier especially, you really shouldn't exceed 47uF
How about 56uf 500v?? Digikey is out of the 47uf 500v. Just wondering
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