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Electronics Forum / Electronics / June 2006Summing non inverting op amp.
Hi, I've a voltage change 3-4 Volts which I need to change into a 0 to 4 Volt signal. I have used an inverting op-amp with a virtual ground to give a cracking result but unfortunately the voltage is going the wrong way (decreasing instead of increasing. I have changed to circuit over to be a non inverting amplifier but I'm worried about the virtual ground. I've been told that summing in a non inverting op amp can be difficult. I took the series resistors out of the circuit from my virtual ground (created from a pot) and from the voltage that I'm amplifying. I have a 560K feedback and 220K to ground giving me a gain of around 3.5. Will I have problems with the virtual ground being amplified to or any other problems? Many thanks in advance. David If I was to conect my ground resistor to my virtual ground would this be a better circuit. I'm now worried that my offset voltage from the virtual ground will also be amplified by the op amp. Cheers again David > Hi, > I've a voltage change 3-4 Volts which I need to change into a 0 to 4 [quoted text clipped - 6 lines] > worried about the virtual ground. I've been told that summing in a non > inverting op amp can be difficult. do you need a virual earth or summing amp? > I took the series resistors out of the circuit from my virtual ground > (created from a pot) and from the voltage that I'm amplifying. I have > a 560K feedback and 220K to ground giving me a gain of around 3.5. > > Will I have problems with the virtual ground being amplified to or any > other problems? huh? Your description of the problem seems to call for something like this. |\ in------------|+`\ | >---+------> .--|-,/ | | |/ | | | 4V--[110K]-+---[330K]-+ Bye. Jasen |
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