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Problem with electret mic-LM386 power supply.

Discussion in 'Electronic Basics' started by xx, Oct 25, 2003.

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  1. xx

    xx Guest

    I'm having some difficulties figuring out why I can power my electret
    condenser mic & LM386 amp with a battery, but then when I try to used 9 volt
    rectified power (from a 15v power wart), it won't work. Any hints as to why
    this wouldn't work?

    The condenser mic and LM386 follow the standard data sheet schematics for
    their use. Nothing special there.

    Thanks,
    Chris
     
  2. Lord Garth

    Lord Garth Guest

    Look for the wall wart to exhibit truly crappy DC that has much ripple and
    that sags under load.
     
  3. tempus fugit

    tempus fugit Guest

    Are you using a regulator as well? Have you looked insode the wall wart to
    see if there is a proper size cap in there?
     
  4. True, but batteries ain't all that great, either. A resistor and 1000
    uF capacitor can take care of much of the progblem. But he failed to
    say what "doesn't work" means. For all we know, he could be
    connecting the 'power wart' up with the wrong polarity. Duh.


    --
    @@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@,@@[email protected]@[email protected],@@[email protected]@[email protected]@[email protected]@
    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
     
  5. Lord Garth

    Lord Garth Guest

     
  6.  
  7. Lord Garth

    Lord Garth Guest

     
  8. If you want to follow in my footsteps, go out and buy a Dorcy 4 LED, 2
    AA cell flashlight for $17 or less.
    http://www.dorcy.com/led new.htm
    I bought a couple and got a $3 rebate coupon too. You can't beat
    those prices. I also bought some of the 1 LED, 1 AAA cell lights for
    $9, and I unscrewed the head and found that the whole PC board drops
    right out, so you can 'experiment' with it. ;-) I think I might
    have posted a pic of that on ABSE.

    That pic I posted a few days ago to ABSE (insanely bright in the
    insanely expensive Pac-Tec case) gave the info, and as for changes to
    part values, one problem with the circuit is that it is dependent on
    the type and individual gains of the transistors you use, and the
    inductor choice makes a lot of diff in the frequency. So giving
    anything other than ballpark isn't going to necessarily work for the
    hobbyist, since they'll have to be changed to accomodate his choices.

    Like, how many people out there are going to cut the RFI suppressor
    off the end of a mouse or keyboard and saw it in half with a ceramic
    tile saw, like I did? Some guys used a Dremel tool with a cutoff
    wheel to cut ferrite, but it's really messy, black soot all over the
    place.

    The Coffee Mints one didn't use anything other than the switch and
    resistors, which suits the neophyte LED light builder just fine. It's
    compact and simple. But it'll never be able to compete with the cheap
    Dorcy LED lights; you get done with buying stuff and counting your
    time building it, it's gonna cost a lot more.

    --
    @@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@,@@[email protected]@[email protected],@@[email protected]@[email protected]@[email protected]@
    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
     
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