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Calculating voltage based on schematic

Discussion in 'Electronic Basics' started by Chris, Feb 9, 2005.

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  1. Chris

    Chris Guest

    So, I know that this is basic electronics, but I'm still a neophyte,
    so I need to ask. I need to learn to calculate the expected voltage by
    looking at a schematic, and subsequently how modify the schematic to
    deliver a different voltage. Can anyone either explain it, or anyone
    suggest an in-depth website or book (websites are wayyy easier for me
    though)? Thanks

  2. Sure, you look at the schematic and note the values of the components and
    associated voltages etc and using those you calculate the expected values of
    voltage/current etc.
    To modify the circuit you calculate the values of the components to produce
    the different voltage required. If you pay attention in class you should be
    able to do this.
  3. Chris

    Chris Guest

    heh, thanks

    unfortuantely this is my class. ooks, internet texts, and soldering
    ron and my workbench. How do I make those calculations though? Where
    do I start? Thanks

  4. John Fields

    John Fields Guest

    Since you're talking about schematics, why don't you post one and then
    ask a specific question that's related to that schematic?

    So far what you're asking is general enough that trying to answer
    whatever it is we think you have in mind is likely to be a waste of
    time. If you don't know how to draw schematics using ASCII characters
    so you can post them to non-binary newsgroups like this one, you can
    post binaries to alt.binaries.schematics.electronic. or to a web site

    There's also a free ASCII schematic drawing package you can download.
    The URL escapes me, but I'm sure if you're interested someone with the
    URL close at hand will post it for you.
  5. YD

    YD Guest

    Book on basic DC circuits, bunch of batteries, bunch of resistors,
    DMM, protoboard to hold it all together. Do all the math on papyrus
    and stylus, calculators are strictly verboten.

    - YD.
  6. The most popular one is AACircuit, developed by Andreas Weber,
  7. The most recent version has the LTSpice -> ascii thing built in. I
    haven't used it, so I don't know how well it works.

    Robert Monsen

    "Your Highness, I have no need of this hypothesis."
    - Pierre Laplace (1749-1827), to Napoleon,
    on why his works on celestial mechanics make no mention of God.
  8. cor

    cor Guest

    The basics?

    to "calculate the expected voltage by
    looking at a schematic, and subsequently how modify the schematic to
    deliver a different voltage. "

    Try simulation. SwCAD Is free.
  9. Chris

    Chris Guest

    Thanks for the response,

    The problem is I don't have a schematic for it yet, and it is
    possible, I may not get one. The project is to modify a power supply
    to a large scale recording console for use on a different board. I'm
    being supervised and tutored on it a bit, however, I'd really like to
    understand math and thought process behind "we need this resistor here
    and this value of cap there" and have ageneral understanding of wat I'l
    be doing before I pop the chassis and go at it.

    Hope this helps a bit wiht understanding my question

  10. John Fields

    John Fields Guest

    It does, but it doesn't help to get you any answers. For example, I
    could say that a resistor is used as a current limiting device, or to
    determine the frequency of oscillation of an oscillator, or to set the
    bandwidth of a resonant circuit, or to adjust the output from a
    voltage divider, or to heat up a crystal oven, or to set the center
    frequency of a filter, and that would all be true, but unless you had
    a specific circuit in mind, it would be pointless to guess about what
    you wanted.
  11. Kitchen Man

    Kitchen Man Guest

    I'm having a hard time understanding why your curriculum did not teach
    you math before getting into circuit analysis. Did you skip a class?
  12. Kitchen Man

    Kitchen Man Guest

    Cut the kid a break. Let him use a slide rule. <eg> Seriously, this
    sounds like a great suggestion; I'd add that he should also buy some
    capacitors and switches and have some real fun. "Teach yourself
    derivatives in three easy lessons."
  13. Chris

    Chris Guest


    curriculum? I'm a musician and studio rat who likes to tech his own
    board. No formal training other than being shown ho to solder in
    exchange for a case of beer. I did forget a very important "the,"
    though. So it should have read "I would like to understand the math
    and thought process behind. . ."

    At any rate, I'm a blank slate here. Following schematics and jumping
    into a mixing console with an expander and meter isn't all that
    difficult, but swapping out the guts of a power supply to get a
    different voltage on the "out" ends, is a bit more difficult, at least
    to me, right here and now.

    The simulation wa great, thank, Ill start workig with ohms law and
    grab some old PC boards we have lying around the studio that are slated
    for trash. try to blow somethings up.


  14. Kitchen Man

    Kitchen Man Guest

    That's a good start. When I was about eight, I plugged a speaker into a
    wall outlet, because I wanted to hear what electricity sounded like.
    Not that I recommend such an experiment, but it was certainly a learning
    experience. =8-0
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