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JFET junkbox recommendations?

Discussion in 'Electronic Basics' started by Anthony Fremont, Mar 20, 2007.

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  1. I'm ordering some parts and I wanted to pick up some JFETs for the junkbox.
    I got some MPF102s and several 2N3819s. I was going to get some 2N4416s but
    Mouser wants >US$2 each, wtf? Anything else I should look at?

    thanks
     
  2. Anthony Fremont wrote...
    Those are small-die low-capacitance types, are you interested
    in low-noise audio types? And, no SMD types?
     
  3. No SMDs please, just to-92 or other thru-hole types. I suppose some audio
    types would be good to have on hand too, anything reasonably cheap (under
    $1). I've been playing with RF lately (oscillators, mixers).
     
  4. colin

    colin Guest

    Theres not a very wide range of ordinary jfets, they all seem to be pretty
    much similar.
    any cheap one would probably do just as well in most circuits.

    Colin =^.^=
     
  5. Joerg

    Joerg Guest

    J310 comes to mind. IIRC $0.14 if you buy 25 at Mouser. Even if you buy
    only one it's just a few cents more. Look at the datasheet to see if it
    fits the bill.
     
  6. Phil Allison

    Phil Allison Guest

    "Anthony Fremont"

    "Anthony Fremont = Psycho **** from Hell "


    The most asinine, most ASD FUCKED pile of sub human

    YANK SHIT on all usenet !!!!!!!!!!!!


    ** Nope .....

    Satan would be soo jealous of losing your undivided attention.

    Sucking his tiny, cold dick is your full time occupation.


    ** Shame about all the UTTERLY ASININE FUCKWIT assumptions

    brain dead, ASD fucked shitheads who post on SEB make !!!!!!!!


    Oh - now I see my tiny oversight .... all those brain dead scumbags

    must be your six toed, pointy headed, dribbling, farting, puking relatives.

    Yet to come down from the trees.

    Still hanging by their tails & eating their own droppings.

    Just like YOU !!!!!

    You MOTHER FUCKING ASSHOLE





    ........ Phil
     
  7. Thanks. Is there any reason that on-semi parts always cost way more?
     
  8. Philth Allison wrote absolutely nothing pertaining to electronics:

    <snipped typical philthy outburst>

    Piss off phil if you don't have anything technical to say. OTOH, if you
    have something useful to offer, I'm all ears.
     
  9. Joerg

    Joerg Guest

    Not that I know of. With logic chips ON is sometimes the better deal.
    But you can't really go wrong with transistors from any brand as long as
    it is a mainstream manufacturer and you get them from a reputable source.

    My favorite used to be the BF245 but it seems to have fallen out of
    favor with several sources, IOW they have them listed but often there is
    no stock. I wish there was some kind of cookie I could set to coax a
    vendor's search engine to show only what's in stock.
     
  10. colin

    colin Guest

    aha bf245 yes I had a huge bag of those from one of those places in
    magazines ofering bags of 100 transistors of this or that type for cheap.

    managed to select quite a few matched pairs out of them,
    for some weird multi channel thing requiring hi impedance diff inputs.

    it surprising how little the specification of common jfets differ compared
    to any other transistor.
    typically :- 25v, 5-25ma, 2pf cds, 0.5pf cgd.

    my junkbox currently contains a bag of 50 j310 wich I got from ebay
    along with some other more exotic microwave phemt type jfets wich are quite
    amasing.

    I dont usually pay much attention to supplier unless I happen to figure out
    one manafacturer has particularly good specs for a certain device type and
    go direct to their website.

    Farnell website realy realy annoys me sometimes
    it lists stuff wich it is discontinued never mind just out of stock
    and when ive been in a real hurry and maybe its late at night too
    ive inadvertently ordered stuff wich is discontinued.

    Despite that farnell has the best parametric search engine accross brands.

    Colin =^.^=
     
  11. Bill Bowden

    Bill Bowden Guest

    I have a bag of 2N4392s for 25 cents each. I can mail you 10 for 2
    bucks.

    http://ourworld.compuserve.com/homepages/Bill_Bowden/sale.htm

    -Bill
     
  12. Meat Plow

    Meat Plow Guest

    Not on topic but watch how you munge your email address. Unless
    is a valid address you have permission to
    use, choose a domain that isn't valid. Addresses like that are harvested
    and sold to spammers who then fill up the dead letter box of the domain
    administrator or whoever is in charge of it.

    Just a heads up since I am a domain admin and get tons of spam in our dead
    letter spool.
     
  13. Rich Grise

    Rich Grise Guest

    www.nowhere.com redirects to here:
    http://www.nowhere.de/

    "example.com", "example.net", and "example.org" are three URLS that are
    guaranteed to never have a web server:
    http://en.wikipedia.org/wiki/Example.net

    Cheers!
    Rich
     
  14. JFETs have an enormous production spread, Vgs(off)
    and Idss being the more important ones. We used to
    buy 2N3819s by the bucketload and select out for the
    various apps.... high Idss for switches, moderate
    Vgs at 1mA for linear/matched apps, large Vgs(off)
    (and lower Idss) for voltage controlled resistors.
     
  15. Guest

    2N4416's come in a real TO-72 can and will be way more expensive than
    a comparable plastic package.
    In TO-92's, 2N5457, 2N5458, J310 are already very similar.

    In terms of MOSFET's, a CD4007 has three NMOS and three PMOS in a
    handy 14-pin package :).

    Tim.
     
  16. Guest

    Kewl -
    Last year I went to the shop for some BC547/BC557 for some tinkering; I came
    home with two bags of 1000 because the 2x 1000 piece *lot* were cheaper than the
    2x 25 pieces I needed. Oh Well. ;-)

    Now I would like the same deal in ZETEX E-Line ...
     
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