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Simpel digital ampere meter

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Darki

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build digital amperemeter

Anyone know how to make a simpel Digital Amperemeter that can handel about 30 - 40 ampere?
(The display driver part is not important right now. Only need a curcuit that can read the ampere)

I need to put it in front of an amplifire power input to see howve many ampere it are using.

I found this curcuit but im not shure it works for me:
http://users.otenet.gr/~athsam/digital_volt_and_ambere_meter_eng.htm

Hope somone can help me, and sorry for my bad english ;)
 

Darki

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Ahh that helped a littel.

Hmm is there any easy'er way to drive 3*7 segments display instead of the link i posted before?
 

kender

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