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Author Topic: THC ongoing  (Read 2255 times)

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Offline stirling

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THC ongoing
« on: March 11, 2010, 08:48:00 AM »
Not strictly a mach question but...

a potential divider gets me the (negative) voltage of the torch (0 to -ve 300Vdc) down to 0 to -ve 5Vdc. I then need to feed this into an ADC. However the input range of the ADC is 0 to +ve 5Vdc. I'm looking at using an op amp as a unity inverter but that's where my electronics gets a little sketchy. I don't really want to get involved with split supply and as the input will allways be -ve I don't think it's neccessary anyway. But... do I need a negative supply to the op amp? Basically I'm a bit lost - are there any electronics savvy Mach users out there that can talk me through it or perhaps suggest a better way even.

So in a nutshell - how to feed 0 to -5V into an ADC that requires 0 to +5V.

Cheers

Ian
Re: THC ongoing
« Reply #1 on: March 11, 2010, 10:15:44 AM »
Howdy Ian,
   This is the best resource I've found for electronics information.
http://forum.allaboutcircuits.com/index.php
   Some really brilliant folks there and eager to help.
Cheers to you,
RC

Offline stirling

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Re: THC ongoing
« Reply #2 on: March 11, 2010, 11:28:21 AM »
Thanks Russ - I'll give it a go

Cheers

Ian