Another simple Ammeter

[force9BOAT]

I made my own Ammeter this weekend.  It works well.  I just need to add an amp scale to the front panel.  Here it is...

http://www.atm-international.com/RenewableEnergy/Wind/a_simple_ammeter.htm

Editors Note:


These stories that point to an outside link make it a lot of steps to go read that then come back here to discuss it. Seems a rather convoluted method. Why not take the time to post it here to save everyone else the clicking? Plus, if your site moves or changes all the info is here where folks can see it. Just a suggestion to make it work better for the users.


Editor

[willib]

Force9 , did you notice if the magnet assembly moved either tward or away from the coil/ board ,under high current ? just wondering ...

[force9BOAT]

Yes, under a large load, I think 15 amps or more I think the Plexiglas shield was pressed against the coil.  At that load the armature was at max possible rotation (reading).  The armature has a small in/out play inside the copper bushing.

Rob

P.S. - I understand the Editor's note.  Next time I'll post directly into here.

[willib]

if you reverse the current through the coil , what happens?

[force9BOAT]

When the current is reversed the magnet's attraction/repellent to the coil is reversed.  This causes the armature to rotate in the opposite direction by the same amount.  Thus the meter can measure current equally in both directions (+/-).  This way you can measure if your batteries are being charged or discharged.

Rob

[willib]

 thats cool , nice job !