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Discussion Starter #1
There is a fairly high pitched "white noise" type sound that comes
from my EV when it is moving. Just in case the sig isn't attached to
this plain text message:

http://www.austinev.org/evalbum/296.html

As you can see, DCP 450 controller, Todd DC-DC converter, etc....

Perhaps this noise is normal and coming from the controller - wouldn't
surprise me with all those amps running around.

What surprises me is that when I turn the headlights on, the noise
diminishes noticeably (almost disappears), so now I'm wondering if it
isn't coming from the DC-DC converter...

Thoughts?

Mike


--
Michael Mohlere
My EV: http://www.austinev.org/evalbum/296.html

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Discussion Starter #2
both controller and DCDC is probably based on switchmode electronics
typically in the 10-20kHz region. maybe less. maybe more.
that might well be what you are hearing
it could be other things but those are certainly usual suspects.
the light affecting it does point to the DCDC yes

Dan

Michael Mohlere wrote:

>There is a fairly high pitched "white noise" type sound that comes
>from my EV when it is moving. Just in case the sig isn't attached to
>this plain text message:
>
>http://www.austinev.org/evalbum/296.html
>
>As you can see, DCP 450 controller, Todd DC-DC converter, etc....
>
>Perhaps this noise is normal and coming from the controller - wouldn't
>surprise me with all those amps running around.
>
>What surprises me is that when I turn the headlights on, the noise
>diminishes noticeably (almost disappears), so now I'm wondering if it
>isn't coming from the DC-DC converter...
>
>Thoughts?
>
>Mike
>
>
>
>

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Discussion Starter #4
I don't have enough experience to say. I would guess it's normal

Dan

Michael Mohlere wrote:

>Is that normal/expected, or is the controller warming up to a failure???
>
>I should be able to disconnect the DC-DC and take it for a quick spin
>to isolate the source of the noise further.
>
>

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Discussion Starter #5
I have a Todd "DC/DC" converter and mine sings a little. It does
change with the load. I don't like it, but I have gotten used to
it. When I had it mounted under the hood I couldn't hear it, but
water got in it and ruined it.

Thanks,

Mike Chancey,
'88 Civic EV
Kansas City, Missouri
EV Photo Album at: http://evalbum.com
My Electric Car at: http://www.geocities.com/electric_honda
Mid-America EAA chapter at: http://maeaa.org
Join the EV List at: http://www.madkatz.com/ev/evlist.html

In medio stat virtus - Virtue is in the moderate, not the extreme
position. (Horace)

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Discussion Starter #6
Dan wrote -


> both (snipped) is
> probably
> typically in the 10-20kHz region.
> maybe less. maybe more.
> might well be
> it could be other things
> usual suspects.

Great response Dan.
Full of good information, precision and insight.
Shows your knowledge of the subject.
Your responses add a level of professionalism that wasn't in the newsgroup
before.

Rush
Tucson, AZ
www.ironandwood.org
www.Airphibian.com
www.TEVA2.com

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Discussion Starter #7
Mike,

Is the noise present when the controller is on and the headlights are off,
but the car is not moving?

Is the noise present when the car is moving with the headlights on but
powered from a battery (replace the DC/DC with a battery)?

Ralph


Michael Mohlere writes:
>
> There is a fairly high pitched "white noise" type sound that comes
> from my EV when it is moving. Just in case the sig isn't attached to
> this plain text message:
>
> http://www.austinev.org/evalbum/296.html
>
> As you can see, DCP 450 controller, Todd DC-DC converter, etc....
>
> Perhaps this noise is normal and coming from the controller - wouldn't
> surprise me with all those amps running around.
>
> What surprises me is that when I turn the headlights on, the noise
> diminishes noticeably (almost disappears), so now I'm wondering if it
> isn't coming from the DC-DC converter...
>
> Thoughts?
>
> Mike
>
>
> --
> Michael Mohlere
> My EV: http://www.austinev.org/evalbum/296.html
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #8
Michael Mohlere wrote:

> There is a fairly high pitched "white noise" type sound that comes
> from my EV when it is moving. Just in case the sig isn't attached to
> this plain text message:
>
> http://www.austinev.org/evalbum/296.html
>
> As you can see, DCP 450 controller, Todd DC-DC converter, etc....
>
> Perhaps this noise is normal and coming from the controller - wouldn't
> surprise me with all those amps running around.
>
> What surprises me is that when I turn the headlights on, the noise
> diminishes noticeably (almost disappears), so now I'm wondering if it
> isn't coming from the DC-DC converter...

Good guess. They can make a little noise when lightly loaded. For
some reason a running motor controller seems to make it slightly
louder and extends it over a wider load range. I've used Todd
converters in both EVs I've built (one with a Curtis 1221B and the
other with a DCP 450) and in both there where conditions where you
could hear a faint whine from the Todd.

Paul Gooch

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Discussion Starter #9
From: Michael Mohlere
> There is a fairly high pitched "white noise" type sound that comes
> from my EV when it is moving... As you can see, DCP 450 controller,
> Todd DC-DC converter, etc... What surprises me is that when I turn
> the headlights on, the noise diminishes noticeably (almost disappears)

My Todd PC30 DC/DC would "sing" softly under very light loads. It was a scratchy fingenails-on-the-blackboard kind of sound. Perhaps that is what it is?

--
"Excellence does not require perfection." -- Henry James
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart-at-earthlink.net

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Discussion Starter #10
<<<< > both (snipped) is
> probably
> typically in the 10-20kHz region.
> maybe less. maybe more.
> might well be
> it could be other things
> usual suspects.

Great response Dan.
Full of good information, precision and insight.
Shows your knowledge of the subject.
Your responses add a level of professionalism that wasn't in the newsgroup
before.

Rush
Tucson, AZ
www.ironandwood.org
www.Airphibian.com
www.TEVA2.com >>>>

After this, Rush probably can't speak and must rely on keyboard input,
as his tongue is planted so firmly into his cheek...

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