current transformers

try this

you will need a negative supply for the opamps, despite the output only going positive. You may need a reverse biased diode across the input of the ADC, 1n914 etc, to stop any -ve volts on powerup

martin

What frequency range are we talking about ? What are you doing to convert the output ? What is the input impedance of the PC interface ? A schematic would help ! Post it to "alt.binaries.schematics.electronics"

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Baron:

"Craig" Hi everyone.

** Fuck OFF - Google MORON !!

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dont you mean

martin

you need a precision rectifier and op-amp etc.. didn't you ask for this before? use a dual op-amp to for a full wave precision rectifier. in order to get a nice 0 to 2.5 v how ever., you should employ a negative rail supply. DC-DC converter is great for this from a single power source.. or i suppose you could whip up a DC to DC from a a 555 timer to get a - voltage regulated , i've done that before how ever, you will find that a simple single chip charge pump DC-DC dual rail us most likely less parts count. unless you pull the trick i've seen before, use an RS-232 port and have output leg off for - voltage, and one on for

• voltage. and use a min pic to convey the info via rs-232 serial. just simply use a USB to rs-232 converter ... etc..

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"I\'m never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

This topic was discussed in considerable detail last September in a thread titled "Help interfacing Current Transformers to ADC" A Google groups search should give you a fair head start.

martin griffith a écrit :

You're hexasperating... And to do so he has to turn his par(i)ty bits to one more digit.

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Thanks,
Fred.