Author Topic: Car voltmeter & stabiliser  (Read 2793 times)

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Offline izuaTopic starter

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Car voltmeter & stabiliser
« on: July 30, 2008, 08:02:10 PM »
This is not exactly robotics related, but I noticed many bright electronists here (damn chatroom still not up).

Someone asked me to do a car voltmeter for him, to check the main battery's voltage. It should be powered by the same voltage it has to measure. I know cars have nasty spikes, especially when starting, but I'm not sure how to design a suitable stabiliser. Any hints?

Thanks.
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Offline Admin

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Re: Car voltmeter & stabiliser
« Reply #1 on: August 01, 2008, 09:07:25 PM »
Quote
I know cars have nasty spikes, especially when starting, but I'm not sure how to design a suitable stabiliser. Any hints?
Just put a bunch of capacitors around power and ground. The capacitor F depends on the noise frequency you wish to stabelize. Google can help you from there ;D


ps - Why not buy a voltage meter instead?
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Offline izuaTopic starter

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Re: Car voltmeter & stabiliser
« Reply #2 on: August 02, 2008, 01:13:28 AM »
Well, I don't know about the frequency, i guess bandlimited white noise :P that's why i mentioned that it's for a car.
I was assuming something with a zenner diode. or..
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