another voltmeter ? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 43 Old 10-30-2009, 07:03 PM Thread Starter
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another voltmeter ?

any opinions on this, I like the size, shape & design for mounting

but what am I getting into for power supply, scaling, I admit, I am lost reading the product specs & brochure on pdf,

http://www.martelmeters.com/products...n=detail&id=83





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post #2 of 43 Old 10-30-2009, 07:30 PM
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You need a 5 volt power supply to power it. It also lacks weather protection for the i/o. Nice meter though.

You could go retro with a Simpson meter:


-Tom (DL650AL2) (KA1TOX) (E-I-E-I-O)

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Last edited by tmcgee; 10-30-2009 at 08:01 PM. Reason: added stuff
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post #3 of 43 Old 10-30-2009, 08:10 PM Thread Starter
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I thought i read on one of the pdf's about powering it with 9v for 7.5-14v operating range, how quickly would something like that drain a 9v battery or a pack of 6 AAs

its small enuf, I figger I could spooge a little silicone around it, it would be in a relativly weather protected location on the bike



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post #4 of 43 Old 10-30-2009, 08:16 PM Thread Starter
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I've been looking at some 270 sweep analog guages, haven't looked at simpson yet, but I've been to the Marshall, Sunpro & Autometer websites but there all 2-1/16" size, the smaller 1.25 of the Martel works perfect

I found a few that match or compliment the V-strom guages well well, but where do you fit it that doesn't look scabbed on ?



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post #5 of 43 Old 10-30-2009, 08:17 PM
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It draws 50mA. 9v batteries are around 350mAh so it would draw one down in about 7 hours.

You can build a regulated 5v power supply that will run off the bikes 12 volt supply for nearly nothing. LM7805 voltage regulator IC and a few ancillary parts and you are good to go. I've built a bunch of them over the years and they would easily handle a 50mA load without even getting warm.

As to the lack of weather protection, you are on your own

Here's a link to a LM7805 datasheet. All it needs tor fixed regulation is a couple of capacitors.
http://www.national.com/ds/LM/LM340.pdf

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post #6 of 43 Old 10-30-2009, 09:20 PM
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Scott is right about the linear regulator to power it (it's simple and easy), but I'd be nervous about encapsulating it with anything. RTV and the like are corrosive over time....a relatively short time.

It's true that the weather shouldn't be much of a big deal if you install it on the flat black plastic, but I know where you ride and waterproof would be better. :mrgreen: It looks like it would be relatively simple to fabricate some sort of rubber boot for it.




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post #7 of 43 Old 10-30-2009, 09:30 PM
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The top flange on that one is grounded. It does come in other package configurations and one of the others might work better. I have encapsulated the entire assembly in epoxy without any problems. I used that TO-220 style and left the top part in the open air since it acts as a heat sink. Since that meter only draws 50mA heat should not be an issue though.

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post #8 of 43 Old 10-30-2009, 09:37 PM
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Quote:
Originally Posted by SCraig View Post
The top flange on that one is grounded. It does come in other package configurations and one of the others might work better.
Yeah, there are lots of variations. It was just a quick example about cost. I'm sure I have a dozen in my "parts department"...

You used epoxy? Like the 2 part quick set stuff?

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post #9 of 43 Old 10-30-2009, 09:39 PM
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Quote:
Originally Posted by tmcgee View Post
You used epoxy? Like the 2 part quick set stuff?
Yep, plain old 2-part epoxy. It's inert when it cures. Lots of stuff used to be epoxy potted but I don't know whether it's still in use or not. It's kind of messy but electrically it works very well.

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post #10 of 43 Old 10-31-2009, 02:33 AM
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Why not use a Datel loop powered voltmeter? No external power required and they are virtually waterproof. Seems like a much simpler and dependable option.
http://www.datelmeters.com/cgi-bin/w...ent-2-wireacdc

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