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i was wondering.....has anyone made or knows how to make an ampmeter.... i want to make an ampmeter but i want one that is a high ampmeter....sny knowledge on how to make one?
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Are you looking for something to have on the interior of your car? If so you can start with a voltmeter circuit like was described in another post a day or two ago. To convert the current to a voltage you have two basic choices, use a small resistance, or use the magnetic field generated by the current through the wire. If you use a resistance you can be more accurate, but you add resistance in your power line so you will have more voltage drop. If you go the route of using the magnetic field, you probably won't be that accurate(you can but it would take some calibrating), but you don't add any more resistance to your power line.
Posts: 2575 | From: GA | Registered: May 1999
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posted
i want to make a amp meter to test the amperage of an amplifier. i thought about buyin one....but i'd like to try to make one.....if i did buy one it would be sumthin like snap-on or mac.....but if i could build one cheaper that would work good...i would
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I could probably figure out how to build one, but I would then need a calibrated ammeter to test it against anyway. On top of that I'm not even sure I could make it for less than the cost of ammeters second hand on ebay.
-------------------- *hmm need to think of a new sig* Posts: 2999 | From: England | Registered: Oct 2000
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posted
Check with Digi-Key or Allied Electronics. Both have web sites. There are a few small current transducers available pretty cheap (~$50). Most use a separate power supply, but can be pretty accurate.
American Aerospace Industries is what I use at work, but I'm not sure how much they cost.
Be sure to look at the bandwidth, because a lot are geared toward 60Hz power transmission. You want it to be accurate over the whole audio spectrum.
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