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Topic: Where to purchase 500mH inductors? |
Keith Hilton
From:
248 Laurel Road Ozark, Missouri 65721
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Posted 31 Jan 2003 2:49 pm |
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| I have been looking for 500mH inductors everywhere. The biggest I have found is through Mouser and they are 150mH. mH meaning mili-Henry. Do any of you build your own? If so where do you get your magnets, and what kind are they? By the way, I don't want to use one side of a little transformer. I know that gets close to the value, but there is just to much variance. Besides that, I would like to have a shielded inductor anyway. Thanks. |
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Michael Brebes
From:
Northridge CA
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Posted 31 Jan 2003 2:58 pm
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| I believe that a 500mH inductor is used in Crybaby Wah Pedals. The can be purchased from Jim Dunlop or any distributors (Mojotone or Antique Electronics). |
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Keith Hilton
From:
248 Laurel Road Ozark, Missouri 65721
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Posted 31 Jan 2003 3:45 pm
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| Michael,thanks for the answer. You are correct. The problem is they want from $17.00 to $40.00. All this inductor is, is a tiny magnet with copper wire wrapped around it. The 150mH inductors from Mouser cost around $1.00 each. I am probably going to have to make my own. I have an inductance meter, but I didn't want to get into winding inductors. May have to. |
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Bob Lawrence
From:
Beaver Bank, Nova Scotia, Canada
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Gino Iorfida
From:
Pittsburgh, Pennsylvania, USA
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Posted 31 Jan 2003 8:31 pm
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If you are a newsensor dealer (i.e. if you are a mfr of music electronic products, you can become a dealer pretty easy), New Sensor has the Dunlop replacemnts reasonably priced
Also, the Mouser 434-03-154J which is a 150mH choke, run 3 in series, and you'll be at 450mh, which is close enough, I'll have to check my notes somewhere, but one of their small audio matching transformers has a primary inductance of about 500mH, which would work fine as well, esp. due to the price...
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Keith Hilton
From:
248 Laurel Road Ozark, Missouri 65721
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Posted 31 Jan 2003 8:55 pm
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Thanks Bob. Looks like they have them. I am going to be using the inductor in a resonate parallel circut. The inductor is in parallel with a resistor and a capacitor.
I realize if I lower the inductance I can raise the capacitance and still get resonance. The reverse is also true. The problem is not just resonance, but how it sounds. What I mean is this: In an inductor voltage leads current. In a capacitor current leads voltage. Changing the values to obtain resonance changes the ratio of how each part, the inductor and capacitor, sees voltage and current. Don't you agree with that Gino?[This message was edited by Keith Hilton on 31 January 2003 at 08:56 PM.] |
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Gino Iorfida
From:
Pittsburgh, Pennsylvania, USA
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Posted 2 Feb 2003 7:24 am
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In a certain circuit, where that 500mH inductor is considred to be the best mean value, it has been observed that certain specimens of this product inductor values ranged from about 350mH-650mH, with 500mH being the most common. One thing that has been keeping folks baffled for years is that with even the 500mH units, there has been a variation on the overall tone. Could it be due to the ferrous materials used, or the construction of the wire used (i.e -- you could build a 500mH inductor with x turns of one guage wire, and y turns of another guage), causing some type of inductive kickback, or coil saturation? That is where people have been starting to use transformers and doing some crazy things with the unused coil to vary the effects...
oh, back to the original statement *laugh* yes, you could get the resonant peak to be in the same place with a different value inductor, just by compensating with the resistor and capacitor values (exactly how a pot can control the frequency on a parametric eq)-- you could even get the peak w/o an inductor using gyrator circuits (look at most classic graphic eq's), however, there is a lot going on behind the scenes so to speak -- in other workds, say you have a resonant peak at 1k for example, you have to look at what is going on with the other frequencies -- in other words, there are a lot of ways to get that peak at 1k, however, in the different mutations, what is happening at 5k or 700hz etc at the same time may NOT be the same-- not saying however if it's better or worse, and actually COULD be better in some cases, however, musicians are hard to please animals, and we expect to hear certian things for them to be right -- a good example would be, try plugigng a guitar direct to a hifi stereo system -- you are gettign a near perfect frequency response from what your guitar can offer, but if thats the case, why do we all love those old 'limited' tone Fender or other tube amps etc? we expect thigns to sound a certain way..
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Paul Osbty
From:
Seattle, Washington, USA
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Posted 2 Feb 2003 8:02 pm
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Personally, I would pop for the correct inductor. Yes, you need the right gauge with the right number of turns. Thinner gauge will require less turns but may affect the Q of the circuit which is also affected by the type of magent (core) that you use, etc, etc. The type of wire is brass in color but is insulated, solid, wire. It can be pricey. See what I mean? There is an art to winding inductors.
With the correct inductor you can fool with cheap capacitors and resistors (under $5 for 30 of each!) to get the right frequency and Q (or slope) of the filter. You could even use a simple selector switch to select the ones you like, if you find more than one. All this would use the same inductor. |
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Keith Hilton
From:
248 Laurel Road Ozark, Missouri 65721
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Posted 4 Feb 2003 6:18 pm
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| I have a Newark catalog and I do buy some parts from Newark. I couldn't find anything near the 500mH inductor in their catalog. I called them to make certain I had not overlooked them. The people at Newark told me they didn't have anything near 500mH. I did locate some through Bob Lawrence's suggestion. If you do happen to find them in the Newark catalog, please give me the catalog number and page number. Thanks to everyone for trying to help. |
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Bruce Derr
From:
Lee, New Hampshire, USA
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