Parts exchange

Discussion in 'Homebrew and Kit Projects' started by N8YX, Aug 6, 2008.

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  1. N8YX

    N8YX Ham Member QRZ Page

    (Disclaimer: This thread isn't started with the intent of commercial vendors or 'volume' sellers to advertising their wares. Other places on QRZ are more appropriate.)

    How many times have you been stuck trying to find the one or two last components necessary for completion of your project - especially when you're dealing with those which are discontinued or obsolete?

    Let's use this thread to help each other out.

    I have a junque-box which is "decades" in size. If you are in need of a hard-to-find component, post the description here and I'll see if I have it. I would encourage others reading this thread to do same, and for the mods to make it "Sticky" if its popularity merits.
  2. AB1GA

    AB1GA Guest

    Hear, hear!
  3. w0rku

    w0rku Ham Member QRZ Page

    need metal box 6" by 10" by 12" or so
  4. w0rku

    w0rku Ham Member QRZ Page

  5. KL7AJ

    KL7AJ Premium Subscriber QRZ Page

    A CAPITAL idea. (Note caps!). Several hams have been doing this already, but it's time to make it "official". Perhaps we could build a database on site, listing who's got what where.

  6. N8YX

    N8YX Ham Member QRZ Page

    455KHz, 9MHz filters

    Looking for a few of these in 300/500, 1.8, 2.1/2.4 and 6KHz BW for a receiver project I'm working on.

    Collins mechanical preferred but will consider all others.

    PM me if you have any.

  7. W2AHP

    W2AHP Ham Member QRZ Page

    I wish I could find a source for project boxes with a tapered front panel rather than the usual rectangular boxes
  8. WR5AW

    WR5AW Ham Member QRZ Page

  9. WA9SVD

    WA9SVD Ham Member QRZ Page

    Done it several times already. Gladly.

    But I'd suggest that if a person is kind enough to share parts, it would be considerate to at least reimburse for any postage or other delivery expenses.
    I know that if I were to receive a part, or anything else from another Amateur, I'd immediately want to defray their cost, and show appreciation for their generosity. While it is silly to worry about the cost of mail for a sheet or two (or three) of data sheets or instructions, or a construction article, (consider e-mail as an alternative) when a package of a bulky item costs upward of $5.00 or more to send off, it can be a bit of a problem, as many Amateurs, particularly those that have well-stocked larders from many years of collecting, may be on a fixed income.
  10. WA9SVD

    WA9SVD Ham Member QRZ Page

    A number of local suppliers (OK, there's admittedly only a small number) have a decent selection of project boxes, and most will special order what they don't have in stock. (You can sometimes find a manufacturer's part or model number on-line from some of the big distributors (Allied, Newark, Mouser) and ask a local dealer to special order the part. (That's not to detract from, or take business away from those distributors, but other than Mouser, they all have what may be prohibitive minimum order requirements.)

    Do you have a local "Fry's" in your area? They might have what you want, and seem to be in the process of becoming ubiquitious throughout the country.

    Also try All Electronics, and some of the others listed already. Many times, they have changing supplies, and they might have something suitable.

    Also look up LMB and HAMMOND for a wide variety of cases and project boxes.

    Not cheap, but they will probably have what you want; with a model number, you may be able to order from a local vendor.
  11. AB8RO

    AB8RO Ham Member QRZ Page

    I agree with you. But, I've offered on several occasions and been refused. I don't know whether the polite thing to do is insist or say thank you but, I've opted for the latter. So, my karma balance needs adjustment and if I offer anyone some parts then I'm going to insist on paying the postage. Please understand that I'm just trying to balance my karma wheel and accept.

    What I like best is to just exchange parts by mail. It costs between $1 and $2 to ship a bubble envelope with a few parts in it so I like to make sure that what I'm swapping is worth a bit more than that so that both ends feel that it's worth doing.
  12. WR5AW

    WR5AW Ham Member QRZ Page

    OK, I've searched high and low around the junk pile. I need a .22uF 25v tantalum cap. Anyone willing to drop one in a plain envelope I'll return a qsl and stamp.

    Now a question. I have a schematic that calls for a 500ohm pot for volume and a 25k variable for tone. I have a half dozen pots, some really nice ones out of commercial HTs, but none in the 25k or 500 range. Any suggestions?

    This is what I'm working on:

    Yea, I gave up on the sine wave project. Maybe another time. Just need something quick and dirty to go with my Picokeyer.

  13. KL7AJ

    KL7AJ Premium Subscriber QRZ Page

    How bout some free advice that won't even cost a stamp? Replace the tantalum cap with a disc ceramic. They're more frequency stable anyway. (You might have to parallel a few to get that value) Tantalums are only necessary when you need a lot of capacitance in a small space.

  14. VK2AKG

    VK2AKG Ham Member QRZ Page

    [C1] C1 does not need to be tantalum (eg plain aluminium electros, poly and disk ceramics would also be OK) nor does it need to be 25V (anything over 10V will be fine). The value of C1 is not critical either so it is likely that any _similar_ sized (eg 0.15 uF to say 0.33 uF) cap you have will do just fine in this application.

    [R4] whilst a volume control is a nice feature it is likely you will only ever set it once. If you believe that will be so for you then you can dispense with it entirely by connecting C2 direct to R5 and playing with the value of R5 (by trying a few different value fixed resistors for R5) until you get the volume you desire.

    If you want to understand this circuit then have a look at the chip's application notes here and discover that none of the components (well except for the 555) are critical.

    Good luck,

    Frank vk2akg
  15. WA9SVD

    WA9SVD Ham Member QRZ Page

    Don'tget me wrong; unless it's a plate transformer for a legal limit transmitter, I'll send something out, and I won't ask (or heaven forbid, demand) reimbursement, it would (IMHO) be the polite and grateful thing to do to at least offer to pay for the postage. If it's only a couple of postage stamps, it's no big deal, but some parts do take some special packaging and added shipping expense.

    On another vein, while I'll gladly help and provide information on parts or equipment, it's hard to expect someone to absorb the cost of photocopying a 200 page instruction manual and postage. (Currently would cost $18.00-$20.00) Quite frankly, the manuals can be purchased from dealers for less. And it's ludicrous to think someone could e-mail such a manual. (OK, daily for about four or five months...) Many of us have ISP's with daily e-mail limitations, and it's hardly realistic to expect that limit to be used up with pages and pages of manuals, at the possible loss of personal e-mail.
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