dent6
Rookie Solder Flinger
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Post by dent6 on Oct 22, 2007 19:37:34 GMT -5
I am trying to do the guitar nuts shielding and it suggests a .33uf 400 volt capacitor for shock protection. Are caps bi directional and if not which end do you soilder to the star ground !
Thanks Brian
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Post by ranchtooth on Oct 23, 2007 8:32:40 GMT -5
Some are, some aren't. Its mostly the big electrolytic "can" shaped caps that require proper polarity. Most of the time the leads will have a + and - side clearly depicted, or sometimes an arrow showing the direction of conventional current flow. If the cap is lacking these types of indicators, then polarity will not matter.
Fake Edit: Forgot one more. Sometimes a tubular type capacitor will have a ring around one end. That indicates the negative side of the cap.
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Post by ChrisK on Oct 23, 2007 18:48:49 GMT -5
You should use a non-polarised bi-polar cap. These would be film and not electrolytic.
Unless it's an old style of wax/paper/foil cap where the black printed ring indicates the outside foil layer for shielding purposes (not that it ever made a huge difference).
If the cap has a plastic covering but either end shows a metal can inside, it's an electrolytic and should not be used for this purpose.
One of this board's members had procured a number of these caps awhile back and was selling them at cost to members. I'll PM him and ask if he still has some.
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dent6
Rookie Solder Flinger
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Post by dent6 on Oct 23, 2007 20:33:41 GMT -5
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Post by sumgai on Oct 24, 2007 1:49:31 GMT -5
dent, Hi, and welcome to the NutzHouse! ;D Where you'll really go nutty when I say unto you - yes, that capacitor will work, but at $8.50 USD, that's at least $7.50 USD more than you should've spent. I suggest two courses of action for you, post haste - cancel that order, and await ChrisK's notice to Cheshirecat. When that worthy comes online, I'm sure he'll mail you one of his units (albeit a different shape) for about a buck, give or take 50¢:.  I have one of them in front of me, as we speak (type/read). It's a bit bigger than some caps, but again, the price is right!  Would I part with it? Oh sure, but let's let the original entrepeneur have first dibs at it, shall we?  Hang tight, help's on the way! ;D sumgai |
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dent6
Rookie Solder Flinger
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Post by dent6 on Oct 24, 2007 7:39:41 GMT -5
Yes I was aware that the price was high (= another $6 for shipping LOL ) but it is on the way too late to cancel. But back to the original question which color lead goes where???
thanks
brian
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Post by sumgai on Oct 24, 2007 12:01:33 GMT -5
Brian, What you are seeing aren't color-coded leads, they're simply pieces of insulation that happen to be colored differently. Why? I dunno!  Put the capacitor into the circuit in any way you wish, so long as the two leads connect to something (but preferably the correct junctions). Orient it physically so as to look pretty, or whatever your heart desires. HTH sumgai |
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Post by ChrisK on Oct 24, 2007 14:44:13 GMT -5
It's not commercial fraud, it's just MARKETING! If anyone has a question regarding electronic components, we'll help. We may bicker amongst ourselves whilst doing so, and even rant and /rant aboot them there "purloining purveyors of poof" as we feel led, but we will help. (You may have to put up with the use of words such as " amongst/whilst" from those in the former (na na na na na na!) British colonies who think that these are cute words, and "aboot and ya betcha" from those that think they talk funny west of Pennsylvania. We know that we're dang smart, unfortunately we also think that we're funny.) We'll give honest answers because we're too dumb/lazy to charge for the help, and we have no commercial interest (right, guys?) in what we recommend. |
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Post by sumgai on Oct 25, 2007 14:54:27 GMT -5
...............
We'll give honest answers because we're too dumb/lazy to charge for the help, and we have no commercial interest (right, guys?) in what we recommend. Hey, I was gonna offer my cap for 95¢, if'n Cheshirecat didn't jump in here soon! Of course, there'd've been a slight fee for profitshipping and handling, but how's a fella supposed to earn even that pittance, when you guys from the western hemisphere of the third stone from the sun are making like Richard Stallman run amok. This ain't no Open Source parts industry, ya know!  ....... ;D sumgai |
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Post by ChrisK on Oct 25, 2007 17:31:36 GMT -5
Pontificate lightly or get off of yer mitre box....... |
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Post by sumgai on Oct 26, 2007 0:01:46 GMT -5
Pontifficate lightly or get off of yer mitre box....... And just what else would you have me do there, bunky.... considering my location? sumgai |
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Post by ChrisK on Oct 26, 2007 23:19:05 GMT -5
....get off of yer mitre box.
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dent6
Rookie Solder Flinger
Posts: 7
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Post by dent6 on Oct 28, 2007 22:43:15 GMT -5
Well the cap worked. I finished the shielding and the guitar sounds great and it has almost no hum at all!
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Post by sumgai on Oct 29, 2007 12:43:09 GMT -5
....get off of yer mitre box. And here I thought all along that you were spelling it the French way!  sumgai |
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Post by ChrisK on Oct 29, 2007 22:59:17 GMT -5
Great!
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Post by mepickerman on Nov 8, 2007 16:44:15 GMT -5
New to the board but you answered my question.
Any chance I could get one of those big, but cheap, caps?
I'll pay!!!
Thanks in advance
Robert
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Post by ChrisK on Nov 8, 2007 22:15:16 GMT -5
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Would I part with it? Oh sure, but let's let the original entrepeneur have first dibs at it, shall we? 
