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Old 12th May 2004, 03:14 AM   (permalink (permalink))
Default Voltage comparator search

I am looking for a VC that can handle at least 25V input.

I search digikey, and I found some that stated that it could handle up to 30V but when still looking at the datasheet, it shows values for a 5V Vcc.

I would like to know the values with 30V and was wondering if anyone knew where i could find a VC that shows value of 30V.

Thanks,
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Old 12th May 2004, 03:52 AM   (permalink (permalink))
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your supply voltage must be higher then the input voltage.
are you looking for this:
http://www.national.com/pf/LM/LM311.html
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Old 12th May 2004, 04:07 AM   (permalink (permalink))
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yeap....that looks good...Do they have that in a quad inputs?

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Old 12th May 2004, 04:16 AM   (permalink (permalink))
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yeah, this low power one.

http://www.national.com/pf/LM/LM339.html
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Old 12th May 2004, 11:50 AM   (permalink (permalink))
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An alternative might be to use resistors to make a voltage divider. Apply the 30 volts across a 1 meg and 9 meg resistor (in series) and 3 volts will be the voltage drop across the 1 meg resistor.
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Old 16th June 2004, 02:21 AM   (permalink (permalink))
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not to bring this topic back up, but thats what I actually was planning to do.....

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Old 16th June 2004, 02:28 AM   (permalink (permalink))
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you talking about supply or input?
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