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| S. Heslop:
--- Quote from: vtsteam on July 13, 2014, 08:41:29 PM ---John thanks -- not food for thought for me, because I can't design circuits. The problem with running long battery wires to an ammeter in a dash panel is that I've read in a few places that ESC's are sensitive to length on those lines. If the batts and ESC are close to the ammeter, then it wouldn't be a problem. Usually the ESC and batts in a model plane are very close. Do you have any other suggestions? --- End quote --- Myself i'm quite happy with putting in a shunt like i'm already doing. I think it's just the ammeter I got is duff. I'm gonna order skateboard wheels today at some time so I may as well order another ammeter from somewhere else. |
| John Rudd:
You could just wire the shunt in to an op amp circuit to give a direct reading feeding a voltmeter and read off the value as Amps......no worries about long wires then if you need the meter within eyesight..... |
| S. Heslop:
--- Quote from: John Rudd on July 14, 2014, 06:59:31 AM ---You could just wire the shunt in to an op amp circuit to give a direct reading feeding a voltmeter and read off the value as Amps......no worries about long wires then if you need the meter within eyesight..... --- End quote --- I appreciate the suggestion but this stuff is way beyond my understanding. It'd be a project in itself trying to learn it all! I ordered another ammeter along with skateboard wheels to give a plain ammeter another shot. Another thing I could do temporarily is buy some banana plug leads for my multimeter and wire it into where the ammeter would go. I left space on that panel for some multimeter jacks so I could get more accurate readings than the cheap meters would give. I'd need to read up on the maths to figure out how much the reading would drop with a 75mv shunt though. |
| John Rudd:
Is there any other info with the shunt? Basically inserting the shunt from ....Ohms law...V=IR, 75mV=I*R, so if the resistance is 75mOhm, a curent of 1 amp will flow.... Whats the range of the ammeter supplied with the shunt? |
| Bluechip:
Don't forget the shunt resistance should be matched to the meter coil resistance... You can't just poke any shunt on any MC meter ... Were they bought as a pair to be used together ?? Dave |
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