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Smt components for sale — Parallax Forums

Smt components for sale

Blackbird455Blackbird455 Posts: 124
edited 2007-10-02 13:28 in General Discussion
I am about to purchase a TON of SMT resistors, capacitors, and regulators for my busi/hobby related to BS/SX components. I·Have to buy them in bulk,·so, I will have way more on hand than I will need for the next two years.............If you want some ............ at a very cheap price, I will·send them to you at my cost, plus shipping. hop.gif

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Comments

  • WhelzornWhelzorn Posts: 256
    edited 2007-09-29 06:15
    Do you have a list of values? or are they just a grab bag assortment?
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2007-09-29 07:37
    I'd be more interested in how you plan to organize them once you have them. My soldering bench stayed pretty neat until the SMD stuff came along. Now it's a disaster. I'm inundated with pepper grain parts, and I've yet to find a way to store the #$%! teensie things so they're easy to find.

    -Phil
  • NewzedNewzed Posts: 2,503
    edited 2007-09-29 11:44
    Phil, I keep mine in the seven-day plastic pill holders from Walgreen's.· Works great.

    Sid

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    Yesterday is history, tomorrow is a mystery, and today is a gift.

    That is why they call it the present.

    Don't have VGA?
    Newzed@aol.com
    ·
  • BeanBean Posts: 8,129
    edited 2007-09-29 13:12
    If you have alot of small parts, these work great
    http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&pa=164267&productId=164267

    Holds 128 different values. Kinda expensive, but each hole has it's own snap on lid.

    Bean.

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  • Blackbird455Blackbird455 Posts: 124
    edited 2007-09-29 14:06
    I will have a list of values in a few days, as far as shipping them to anyone that wants them I guess I can go to a "head" shop and get some of those little "crack baggies" and label the bags. I might have as many as 10000 10k 1208 resistors, and there will be several thousand 4.7k, and 470k each.

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    Noli nothis permittere te terere
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2007-09-29 16:04
    Sounds like you made wise choices of values; 10K, 4.7K, and ? is that 470ohm or 470k. I've never had much use for anything above 10K except with op amp construction and I foolishly bought too many of those values. 470ohm is a must for LEDs.

    1208 is a wise choice of size for one off productions. Anything smaller is microscopic.

    What about your capacitors? 47uf, 22uf, 10uf eletrolitics in 16 volts or better? 1uf, 1.uf, and 0.1uf in ceramic for MAX232 and by-pass caps. Once again, I've acquired too many other sizes that are not really needed.

    May I suggest counting with something like a pallet knife or a butter knife on a tray? Pharmacist count pills that way and it really speeds counting small items that are likely to stick to you fingers. Of course it may be easier to weigh out a bulk quantity.

    I can easily buy the SMD resistors and caps over the counter locally. But above all, I would love to know about the regulators, specifically 5 volt and 3.3 volt as these are common consumers of board real estate. Are they 100ma versions or have you 1 amp output? Are they 7805 and 7803.3 or 2940-5 and 2940-3.3. The 2940 series is low drop out and while it uses a bigger capacitor on the supply side, it is well worth being able to use 4 AA cells rather than 5 to get regulated power at 5 volts.

    Since I have been on Pantoloc [noparse][[/noparse]ulcer meds] for 2 months, I have a handy set of small pill bottles.

    I wish 'head' shops didn't cater to crack as it is seriously addictive, even after one or two tries it will ruin an A student's life forever. In the 60s and 70s, many such 'head' shops wouldn't touch anything to do with the stuff. I'd rather send you a bundle of bags from Taiwan than have you support them. Just PM your mailing address and I'll send you 100 'made in Taiwan' tiny baggies ASAP.

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    "Everything in the world is purchased by labour; and our passions are the only causes of labor." -- David·Hume (1711-76)········
    ···················· Tropically,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
  • Blackbird455Blackbird455 Posts: 124
    edited 2007-09-29 17:28
    Kramer,

    Thanks for the offer and for your concern, I was being a bit sarcastic when I called them "crack baggies", as I am from a law enforcement and also military counterdrug task force background. I have not completed my order for all of the components, and will not until Monday P.M.- Tuesday a.m. (USA CST -5 GMT). I will get an assortment of regulators , fixed, and variable, for the same reason , they are space hogs.

    If anyone has a special request on SM parts, PM me by tonight and I will see what I can do.

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  • parts-man73parts-man73 Posts: 830
    edited 2007-09-30 16:29
    Baby food jars? As a parent of a 9 month old, I recycle 10-15 a week. They might make ideal SMD resistor containers.

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    Brian

    uController.com - home of SpinStudio
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2007-09-30 17:46
    Are these going to be embedded in paper tape? While it adds a lot of bulk, that is what I am usually getting - short strips of 5 or 10 items on a strip. I suppose that if you buy a whole reel they are quite cheap. Still, you can easily get stuck with a lot of values that don't move and bulky storage problem.

    I listed the values of resistors and capacitors that I use about 95% of the time for I.C. work. Other stuff may sit in a box for years. Mostly the resistor values are just for pullup or pulldown or limiting current to LEDs. Mostly the capacitor values are used to clean up the regulated power, either as assisting a particular voltage regulator or at bypass capacitors. It doesn't make much sense to go about 10 or 16VDC, as the regulators would be dumping too much heat. Eighth watt resistors are quite enough.

    Other than maybe LEDs, a 220 ohm and a 330 ohm resistor for some situations, and a 2n2222 transistor or 2n7000 MOSfet package, I wouldn't buy anything in units of 1000s for fear that I would be looking at them forever. Diodes for spike protection might be another useful item.

    As you can see, there isn't more than a dozen or so items. Most of the people involved in this as a hobby want 5 or 10 of something. I'd just put ten each all together in 100 to 1000 kits of ten each and see how the response is. It would make pricing and handling so much easier as you would be selling one kit plus postage.

    You might consider resonators at a variety of useful frequencies -4, 5, 8 10, 20, 50 megahertz. And that odd little 32.something Kilohertz clock crystal. It can actually make an SX28 into a low power time piece.

    Having silicon SMDs for communicatons may be another 10 each kit, including MAX232s, and an ultralow power RS422/485 transceiver, and maybe even IrDA chips like the MAX3130 or MAX3130. Related components would round out the kit.

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    "Everything in the world is purchased by labour; and our passions are the only causes of labor." -- David·Hume (1711-76)········
    ···················· Tropically,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
  • WhelzornWhelzorn Posts: 256
    edited 2007-10-01 17:24
    Kramer, where exactly do you find SMD components locally? I can't even find them in smaller quantities than 1000+ online. But if that's how many I have to buy, I'd prefer to do it locally.
  • Kevin WoodKevin Wood Posts: 1,266
    edited 2007-10-01 17:49
    Isn't Kramer teaching English in Taiwan?

    Forget the baggies, send some takeout!
  • pwillardpwillard Posts: 321
    edited 2007-10-01 21:12
    Kramer said...
    As you can see, there isn't more than a dozen or so items. Most of the people involved in this as a hobby want 5 or 10 of something. I'd just put ten each all together in 100 to 1000 kits of ten each and see how the response is. It would make pricing and handling so much easier as you would be selling one kit plus postage.
    You would think that RETAIL vendors would figure that out... but that just never happens with Brick and Mortar stores.· Fty's is another example of a place that carries 90% of what I'll never want and 10% of what I do want. Oh, and I bought that 10% and they never restock.

    One exception... They do·restock the very small subset of Parallax products they sell.

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    There's nothing like a new idea and a warm soldering iron.
  • Blackbird455Blackbird455 Posts: 124
    edited 2007-10-02 03:25
    Ok, Here is a new spin to this............... I would be willing to purchase these components "in a custom manner",as a convenience to you guys, to order the specific values that you need..........and as part of my business. But..........I am not sure how Parallax feels about people "advertising" on their message board, which is what it would amount to , taking custom, preferrential orders. So.............I will officially "move this thread" to my personal EMAIL dan@lowattage.com, if you want specific values in specific quantities.

    Dan@lowattage.com

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  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2007-10-02 06:59
    Yeah, I'm in Taiwan. Some things are really easy to get cheaply and other things I have to import from the U.S.A, even though the were originally made here. Go figure.

    Parallax seems to be quite tolerant of other businesses being mentioned here as 'one hand washes the other'. They really want to just provide their core business of microprocessors, supporting hardware, and learning materials. Usually trying to exclude businesses that are doing other things just creates ill will that takes away from the fun of it all. As long as the focus is on the mutual benefits of your business combined with Parallax products, I don't think anyone will fuss about discussion. And Parallax really doesn't want to try to cover all aspects of hobby electronics.

    Advertising is a whole different issue. Get a website going and just start by relying on the referals. It isn't expensive. I have a Yahoo website for $12.95/month that included a free name in the package deal. If you are looking for examples, Bean has a website referred to in his email signature. I think P.J. Allen does too.

    While resonators, resistors and capacitors have huge savings in quantities of 10,000; chips are not really like that. At Natonal Semiconductor, you can get 100 or 10,000 for the same price. So, it is better to order a lot of different popular chips in smaller quantity to build a minimum order than to order one big quantity.

    Inventory is always about quicker turn over. One has to be very selective. And unless you have an immediate use for something, it is best to just have enough to allow you to fill orders and make a decent profit.

    The resonators, resistors, and capacitor kits may bring in customers for higher priced items though. I'm sure the stores in Taiwan use them to bring customers to their doors as they are must have items with little profit.

    And, good luck.

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    "Everything in the world is purchased by labour; and our passions are the only causes of labor." -- David·Hume (1711-76)········
    ···················· Tropically,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
  • Blackbird455Blackbird455 Posts: 124
    edited 2007-10-02 13:28
    yeah I have a domain, not maintaining the site currently, should have it back up in a few weeks.

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    Noli nothis permittere te terere
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