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changing from 1.5V battery to 9V battery

Discussion in 'Beginner Electronics' started by GuitarPsych, Mar 15, 2006.

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  1. GuitarPsych

    GuitarPsych Guest

    I have a very simple circuit that I run an electric guitar signal
    through and I'm thinking of modifying it from a 1.5 V battery to a 9V
    battery. What modifications do I need to do to the circuit? (I am
    obviously a beginner).
     
  2. JeffM

    JeffM Guest

    ...modifying it from a 1.5 V battery to a 9V battery.
    Seems like a dumb idea. A cell is much cheaper than a battery.
    What advantage could there possibly be?
     
  3. GuitarPsych

    GuitarPsych Guest

    These are reasons just off the top of my head:

    1) To go through the process just to learn.

    2) To standardize all my effects pedals so I only have to carry 1 type
    of extra battery, therefore minimizing carrying space and weight and
    minimizing the chance I will be out of the one I need.

    3) The standardization will also eventually allow me to work on a
    project that allows all my pedals to run on a power supply that accepts
    multiple pedals. The power supply works with pedals expecting 9V. I am
    unclear if it would work with pedals expecting 1.5 V... I have my
    doubts, therefore the conversion project.

    4) The 1 AA battery dies quickly.
     
  4. GuitarPsych

    GuitarPsych Guest

    I'd rather not make this about a debate as to whether it's a good idea
    overall. I may in fact not actually do the conversion. Regardless, I
    would just like to know how to go about doing it, IF I chose to.
     
  5. default

    default Guest

    If you plan to run your stuff on a power supply the 1.5 volt can be
    met with one of the three terminal regulators to step down the voltage
    from 9. I think the LM317 outputs something like 1.2 volts with no
    adjustment resistors. Goggle for it and the data sheet will tell you
    how to connect it and how to calculate the resistor to give the output
    voltage you want.

    Running it with a 9 volt battery will just waste a lot of power and
    end up costing a lot more.

    You could make a buck switching supply to lower the voltage
    efficiently - but you're still talking about a more expensive battery
    cost.

    Going the other way, 1.5 to 9, makes more sense if size isn't a big
    concern. Particularly if you can use D batteries.

    There's a semi-obsolete IC designed to do just that - Part is the
    TL496. Designed to take 1.5 or 3 volts and output 9 volts at 20-40
    milliamps.

    Someone was marketing a kit for the TL496 with all the parts and
    circuit board to make a 9 volt battery eliminator.
     
  6. GuitarPsych

    GuitarPsych Guest

    I can't tell if you are being sarcastic, but if not, all I can do is
    again ask my original question. It is a very simple circuit, 9
    resistors and 4 capacitors. I'm just wondering in general what
    modifications I would need to do if, on the diagram it lists a 1.5V
    battery and I want to use a 9V battery. Would I raise/lower the values
    of certain resistors/capacitors? Would I need to do anything?
     
  7. GuitarPsych

    GuitarPsych Guest

    I must be asking this question in a way that is throwing people off,
    because there seems to be a lot of resistance to actually answer the
    question. Let me try another way:

    Let's say a friend of yours is in an electronics class and given a
    simple circuit design, 9 resistors and 4 capacitors, with a 1.5V battery
    power supply. The assignment is to test the circuit to see if it would
    function if the battery power supply were changed to 9V. How would you
    suggest to your friend to do that? What would they look at in the
    circuit? And if something would need to be changed, what would it be?
    Raising/lowering resistor/capacitor values? Adding/subtracting
    resistors/capacitors? etc.
     
  8. GuitarPsych

    GuitarPsych Guest

  9. Tater Schuld

    Tater Schuld Guest

    rather than question why you would want to do so, I'll suggest an answer.

    I assume you either want to have all your gear run off one power supply, or
    you want to keep buying only one type battery(I suggest the single supply
    idea, as batteries add up).

    I don't think a LM78015 (does this exists?) would do it as the input voltage
    would be too high and cause a lot of juice to be lost due to heat (and
    lessen the life of your battery a LOT)

    tell us what the power usage in milliamps is and maybe you could just use a
    simple resistor voltage splitter.

    I can almost bet that someone is going to suggest a DC-DC converter that is
    a 1000 times more complicated that what you need.

    in fact. here's the circuit you need......2 resistors tied in series. one
    resistor will be 6 times the size of the smaller resistor. the smaller
    resistor needs to equal the total resistance of the circuit in question,
    which you calculate using ohms law and the current capabilities of the
    circuit that needs the 1.5 volts.

    corrections anyone?
     
  10. GuitarPsych

    GuitarPsych Guest

    Ok, thanks for the info. Regarding linear.com, I can't seem to figure
    out what software to download ... there are many options yet none
    clearly say "circuit simulator".
     
  11. JeffM

    JeffM Guest

    You're looking for a SPICE package:
    Linear Technology's Simulation Program with Integrated Circuit Emphasis
    (LTspice) aka "SwitcherCAD III".
    (Direct link) http://ltspice.linear.com/software/swcadiii.exe
    ..
    ..
    Re: Your posting style:
    The gold standard is
    to leave the name of the person to whom you are responding
    and just enough of the previous post to give "context"
    which reminds the next reader/responder
    what the last part of the thread mentioned.

    Your new text goes BELOW that.
    (Note how I did it.)
     
  12. nikhilele

    nikhilele Guest

    better u use a step-down/buck DC-DC convetor which will give u a nice
    1.5v from a 9V battery.

    U might be doing this to have longer life of battery.

    if u r using 9V - 1.5V linear voltage regulator you will waste a large
    amout of power.

    So go for switching regulator.
    they price less then 1$.
     
  13. Tater Schuld

    Tater Schuld Guest

    got a source for these?
     
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