[NSRCA-discussion] regulators

[Robert Mairs]

I think your right, I'm using an I4C volt meter.  Has a 15" lead, 24 gauge.  Then another 5" lead on the reg, connected by a servo type connector.  I'll try shortening that later.
Thanks,
Bob


  ----- Original Message ----- 
  From: Bob Richards 
  To: NSRCA Mailing List 
  Sent: Wednesday, December 06, 2006 8:53 AM
  Subject: Re: [NSRCA-discussion] regulators


  Jim,

  You are confusing mah and ma. The first is current, the second is capacity.

  The TP packs are rated for up to 15C I believe, so a sustained current of 1.5A is certainly within the operating parameters of the battery.

  Robert, I suspect the problem may be in the way you are measuring the voltage. If you have a long lead of small guage wire, you will have a voltage drop across that wire. It will be proportional to the wire length and the current. The regulator has no way of adjusting for that.  If at all possible, make the voltage measurement right at the output terminal of the regulator.

  This is one problem that I have with the 9ZAP internal battery tester. If you turn on the load, the voltage seems awful low until you take into consideration the long lead between the plane and transmitter. It would be much better to have a short lead, or use a load right at the battery end so there is negligible voltage drop across the long lead.

  Keep in mind that a regulator may also have a certain amount of "droop". The better the regulator, the less droop in voltage with an increase in current.

  Also, regulators will have an inherent voltage drop, such that the input voltage must stay a certain amount above the regulated voltage for it to be able to regulate properly. I'm not sure about the Jaccio regulator, but I think this value is very low, and I would think would work properly with any input voltage above 7v.

  Bob R.



  jivey61 at bellsouth.net wrote:
    Robt
    Your battery is 480 mah and you are trying to make it produce
    500mah,1000mah,and 1500mah. The battery does not have the capacity to
    produce these currants.The regulator is ok.

    Jim Ivey
    ----- Original Message ----- 
    From: "Robert Mairs" 
    To: "NSRCA Mailing List" 
    Sent: Wednesday, December 06, 2006 7:53 AM
    Subject: [NSRCA-discussion] regulators


    > I've got a Jaico that regulates to 6.11 volts. Using a 480 mah TP lipo,
    > and the Jaico, I got the following.
    >
    > no load, 6.11v
    > 500mah load, 5.72v
    > 1A load, 5.63v
    > 1.5A load, 5.54v
    >
    > Just with the battery, no regulator I get
    >
    > no load, 8.2v
    > 500mah, 7.84v
    > 1A, 7.51v
    > 1.5A, 7.2v
    >
    > I don't understand. Why doesn't the regulated voltage stay at 6.11v with
    a
    > load? I always thought using a regulator was supposed to give you a
    > constant voltage so the servos reaction would always be the same, yet it
    > acts just like a battery, just not as great a drop off it seems.
    >
    >
    > _______________________________________________
    > NSRCA-discussion mailing list
    > NSRCA-discussion at lists.nsrca.org
    > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

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