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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...
ohh I did not know that about the battery. Yes the battery says 4.5Ah..
Maybe i should use a resistor.
I have thinked about using a oscilloscope. I have actually tied with my computer's sound card and i got a signal like this:
**broken link removed**
It look like it goes down to 0 volt but im...
It worked kind of... But the BU2527AF died when i connected it to a 12 volt 4.5 amp battery... And it was rated 15amp? Strange :cry:
The Motorola MGP20N40CL's datasheets say it can take 20 amps is that right?
Datasheet: http://www.datasheetcatalog.net/pt/datasheets_pdf/M/G/P/2/MGP20N40CL.shtml...
Interesting ideas you come up with Thx for that :D
But now i have found 2 great working transistor and made this circuit:
**broken link removed**
And it works good and can handel more than 15 volt :)
Now i just need a way to get it to drive my transformer.
I tyred to connect my transformer...
Ohh yes i just found this other cuiciut:
http://www.geocities.com/CapeCanaveral/Lab/5322/fbt2.htm
Wich uses the 555 IC too.
I will try one of them. When i get my my fingers in a 555 IC, maybe first in a week :cry:
Is there any big difrent on the difrent types of IC 555? I noticed there are...
I have not teste them like that but i will try later today.
I tink they work..
No i dont have a datasheet on IRFC50.. But i will test it the way you tell me and see what it is :)
That sound like i will work :O
I will try that :D
Added after 4 hours 13 minutes:
Now i have experimented with a 1 M ohm pot resistor, a 330mF 200v capacitor and a 220mF 25v capacitor. But i still cant get it to work.
I can see the capacitor slowly charging if i mesure over it, and i can...
hmm it looks very confusing that circuit and i dont realy understand howe i should use it.
Do you have a simpler circuit, or can you explain it better?
The only thing i need it to do is to turn the power on and off on the transformer.
I have a proplem.
I need at circuit there can drive my transformer. I have a oscillation/timer circuit wich look like this:
**broken link removed**
But i cant get it to work. Anybody have any idea what could be wrong?
Sorry for my bad english hope you understand me anyway :)[/img]
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