Advertise on Bikeforums.net



User Tag List

Results 1 to 16 of 16
  1. #1
    la vache fantôme phantomcow2's Avatar
    Join Date
    Aug 2004
    Location
    NH
    Posts
    6,266
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    How much voltage into Line in?

    When you have a microphone or whatever else you might plug into the "Line in" jack on your PC's sound card, how much voltage is actually going in? Or, how much voltage is permissible to enter in here?
    C://dos
    C://dos.run
    run.dos.run

  2. #2
    So say we all.
    Join Date
    Nov 2004
    Location
    Austin, TX
    My Bikes
    Gary Fischer Wahoo, upgraded Specialized Allez
    Posts
    728
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by phantomcow2
    When you have a microphone or whatever else you might plug into the "Line in" jack on your PC's sound card, how much voltage is actually going in? Or, how much voltage is permissible to enter in here?
    Now that's a coincidence. I'm just now about to try to run from my pedal's output jack into my compy's line-in. Hope that works...

  3. #3
    la vache fantôme phantomcow2's Avatar
    Join Date
    Aug 2004
    Location
    NH
    Posts
    6,266
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Well my plan is to make my souncard into a digital oscilloscope. Might as well get some use from it
    C://dos
    C://dos.run
    run.dos.run

  4. #4
    You Know!? For Kids! jsharr's Avatar
    Join Date
    Apr 2005
    Location
    Just NW of Richardson Bike Mart
    My Bikes
    '05 Trek 1200 / '90 Trek 8000 / '? Falcon Europa
    Posts
    6,113
    Mentioned
    12 Post(s)
    Tagged
    3 Thread(s)
    1.21 gigawatts
    Are you a registered member? Why not? Click here to register. It's free and only takes 27 seconds! Help out the forums, abide by our community guidelines.
    Quote Originally Posted by colorider View Post
    Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.

  5. #5
    Senior Member
    Join Date
    Nov 2006
    Location
    Charlotte, North Carolina, USA
    My Bikes
    '71 Raleigh Sports, '84 Schwinn LeTour on the trainer (and available for hill repeats), '06 Scott CR1 SL (Ksyrium SL), and a yet-to-be-determined TT bike.
    Posts
    1,643
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Voltage doesn't move. It's a potential across two different points in a circuit. Jes' saying, since that's gonna be on your next test.

    My Ratshack microphone uses two AAA 1.5V batteries, though I can't tell without taking it apart if they are in series or parallel.

    Perhaps Catatonic has a better answer for you.

  6. #6
    It is what it is... Minesbroken's Avatar
    Join Date
    Aug 2005
    Location
    Long Island NY
    My Bikes
    Trek 6500 w/ stuff
    Posts
    806
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by phantomcow2
    When you have a microphone or whatever else you might plug into the "Line in" jack on your PC's sound card, how much voltage is actually going in? Or, how much voltage is permissible to enter in here?
    I would say between 2 and 8 probably like any other preamp.
    sign here so we can do stuff to your stuff...

    myspace
    myplace
    my bike

  7. #7
    It is what it is... Minesbroken's Avatar
    Join Date
    Aug 2005
    Location
    Long Island NY
    My Bikes
    Trek 6500 w/ stuff
    Posts
    806
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    its quite possible that its even less depending on the size of your microphone and its intended purpose.
    sign here so we can do stuff to your stuff...

    myspace
    myplace
    my bike

  8. #8
    la vache fantôme phantomcow2's Avatar
    Join Date
    Aug 2004
    Location
    NH
    Posts
    6,266
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by VegaVixen
    Voltage doesn't move. It's a potential across two different points in a circuit. Jes' saying, since that's gonna be on your next test.

    My Ratshack microphone uses two AAA 1.5V batteries, though I can't tell without taking it apart if they are in series or parallel.

    Perhaps Catatonic has a better answer for you.
    Fine
    How much potential difference between charges can exist, allowing for movement of electrons to and from my soundcard?
    C://dos
    C://dos.run
    run.dos.run

  9. #9
    Senior Member
    Join Date
    Nov 2006
    Location
    Charlotte, North Carolina, USA
    My Bikes
    '71 Raleigh Sports, '84 Schwinn LeTour on the trainer (and available for hill repeats), '06 Scott CR1 SL (Ksyrium SL), and a yet-to-be-determined TT bike.
    Posts
    1,643
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Perhaps a better way to ask is: what's the max rated voltage allowed at the input of my soundcard? With the implication that the second point is at the output of whatever device you're pluggin' in.

    Does your o-scope have a rated electrical output?

  10. #10
    Tail End Charlie Ritehsedad's Avatar
    Join Date
    Sep 2005
    Location
    Maine, The Way Life Should Be
    My Bikes
    Fuji Nevada MTB, Giant OCR1
    Posts
    545
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by VegaVixen
    Voltage doesn't move. It's a potential across two different points in a circuit. Jes' saying, since that's gonna be on your next test.

    My Ratshack microphone uses two AAA 1.5V batteries, though I can't tell without taking it apart if they are in series or parallel.

    Perhaps Catatonic has a better answer for you.
    Probably in series.
    Why isn't 11 pronounced onety one?

  11. #11
    Footballus vita est iamlucky13's Avatar
    Join Date
    Jun 2002
    Location
    Portland, OR
    My Bikes
    Trek 4500, Kona Dawg
    Posts
    2,118
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I think only a couple of volts.

    This site, which also has some O-scope software, mentions using a buffering circuit. He also has a schematic for said circuit linked to in the FAQ.
    "The internet is a place where absolutely nothing happens. You need to take advantage of that." ~ Strong Bad

  12. #12
    So say we all.
    Join Date
    Nov 2004
    Location
    Austin, TX
    My Bikes
    Gary Fischer Wahoo, upgraded Specialized Allez
    Posts
    728
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by RedHairedScot
    Now that's a coincidence. I'm just now about to try to run from my pedal's output jack into my compy's line-in. Hope that works...
    It works...well.

    pc: check out zelscope and xoscope for good soundcard-as-scope stuff. The schematic indicates that the max voltage it'll put out is 12V (or, +-6V). A footnote says that it's adapted from a circuit in Art of Electronics by Horowitz and Hill -- if you don't have that book, starve until you get it. It's bit and gray and awesome!

  13. #13
    Trans-Urban Velocommando ax0n's Avatar
    Join Date
    Nov 2006
    Location
    Lenexa, KS
    My Bikes
    06 Trek 1200 - 98 DB Outlook - 99 DB Sorrento
    Posts
    2,400
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've found line level is usually around 5v or so. Much more than that, you start to run out of headroom.
    ax0n: Geeky and bikey
    My latest tip: Carrying your laptop
    My latest geeky project: Ethernet-testing cuff links

  14. #14
    pluralis majestatis redfooj's Avatar
    Join Date
    Feb 2004
    Location
    DEN
    My Bikes
    blue fuji, black khs, yellow giant, and a little red 'Rosa
    Posts
    2,547
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    line level output for car cd players range from 1.5 to 8v , typically 2 or 4
    i think computer sound cards are in hundreds of millivolts (sub 1v)

  15. #15
    Senior Member
    Join Date
    Aug 2003
    Location
    Stockholm, Sweden
    My Bikes
    Stycle Aluminium 26" (Professional Bike! I'm Hot!)
    Posts
    49
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I was going to say about 1 volt peak to peak and i nearly remembered right. (0.32Vrms = 900mV p-p)

    http://en.wikipedia.org/wiki/Line_level

  16. #16
    Charles cpb406's Avatar
    Join Date
    Dec 2005
    Location
    Sugar Land, TX
    Posts
    71
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The audio inputs are designed to accept high-level audio signals: 2 Vrms or +8 .2 dbu, which is the standard output level from CD and DVD players.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •