homemade ammeter

[KF-Puffin1]

COWBOY!!!!!!!  Thank you for that link man ...found all kinds of things i want in there.stuff i have been looking for for 2 weeks now.

[Cowboy]

people also use http://digikey.com/ but I've never gone through them.  I've been all Mouser since my local shop stopped selling components several years ago.  They're great over the phone too. 

[wess]

Try electronic supply stores. (Radio Shack didnt have one) but other electronic parts stores have them. A Velleman 12v 1-30 amp dc panel meter runs $12.50. Some older auto parts stores may have one in the back covered with dust..lol...thats how I got mine & it was only $10 and goes to 60 amps. But most hydroxy generators only go to 20-30 amps.

[Justin Frye]

ill have to check out the parts store then. theres actually one here close in town that the whole building has dust all over it so im bound to luck up there. haha





-justin

[Jake]

I got my ammeter on ebay. try typing in tractor ammeter. they have various gauges made for tractors that work great for hho boosters and you can get em for about $10

[H²+O]

I was wondering what kind of amp meter i want, a DC Amp meter or a AC Amp meter.
I know the size depends on the cell I want to build (the amps i want to draw from the cell, that i want to see on the meter)
Where is a good place to find a good one? one that actually has a bunch a little lines in it and not
" -30a -15a 0 15a 30a " (like a 50amp or somesuch)  know what i'm saying?
thanks! 
steve

[Tink]

Definatelly get a DC ammeter! that is if you are measuring DC. They are very different. Ebay has the best deals I've seen. I don't know how good the digital ones are but the analog ones work fine.
Tink

[H²+O]

could someone tell me what '200mv' means?
 http://www.electronicsurplus.com/commerce/ccp70711-0-100--dc-amp---200mv--miniature-50-188121jhpk1-4899.htm
this site has some good deals (i think!)
Meters 0-100 DC AMP Requires a 200MV Shunt not included Miniature scale 1-1/2". Meter movement is 200MV DC

thanks!
steve

[biggy boy]

200MV= 200 milivolts.
There is 1000 milivolts in 1 volt

So 200MV is less then a quarter of a Volt.

Glen

[H²+O]

yeah thanks for telling me what a MV is  .  now why does the add even say that it has 200mv?
I have a couple guesses so tell me if i'm wrong..
1st guess, the MV has something to do with the accuracy of the reading.
2nd guess, the MV is how many volts (aka: not very many) in order to power it.

let me know
Thankyou!
steve

[Bob]

Well electricity is interesting stuff... you can have 50 amps and no (zero) volts and you will not have any power.... but with even a very tiny amount of voltage you will have power to do work.
 I am guessing it needs 200MV to power the movement in the meter is all...
...
 MANTA:
 lots of talk here about shunts and stuff... How do you make a shunt for a meter...?
say I have a 1~500 MA meter and I want to read 1 to 50 AMPS on it ....  how do I make a shunt for that ?
.... do you feel like being the teacher tonight ?...AGAIN? <GRIN>
thanks !
...
Bob..........