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orangerobot · 24th July 2006, 09:06 PM

Hi all,

Noob here. Can someone please tell me what part I need to do the following job? I want to input a varying voltage from 0-5v (using a PIC) and have the output be 0-12v (see sketch below). I know that a transistor can do this but I really need a linear relationship between the input and output voltages. Can someone recommend a specific part for me? Thanks!!!!

____________12v in
____________|
____________|
__________-----
0-6v ---->|____|----> 0-12v
__________-----
____________|
____________|
____________-
____________.
____________Ground

Input Output
----- ------
___0v___0
___1____2
___2____4
___3____6
___4____8
___5___10
___6___12

OutToLunch · 24th July 2006, 09:10 PM

op amp set up with non-inverting gain of 2. To get the full range of 0 to 12V, though, you're going to have to bias the op-amp from somewhat higher than 12V on the Vdd end and somewhat lower than 0V on the Vss end. You could go for a rail-to-rail op-amp - at least that would get you close to the rails without having to change the power supply.

Hero999 · 24th July 2006, 09:36 PM

Yes, use an op-amp, PICs may be good for complex applications but for something simple like this you can't beat an op-amp. I think PICs are often over-used these days, people often use them because they don't know how to do it the "propper way".

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24th July 2006, 09:06 PM	(permalink)
orangerobot	What is this?? Hi all, Noob here. Can someone please tell me what part I need to do the following job? I want to input a varying voltage from 0-5v (using a PIC) and have the output be 0-12v (see sketch below). I know that a transistor can do this but I really need a linear relationship between the input and output voltages. Can someone recommend a specific part for me? Thanks!!!! ____________12v in ____________\| ____________\| __________----- 0-6v ---->\|____\|----> 0-12v __________----- ____________\| ____________\| ____________- ____________. ____________Ground Input Output ----- ------ ___0v___0 ___1____2 ___2____4 ___3____6 ___4____8 ___5___10 ___6___12

24th July 2006, 09:10 PM	(permalink)
OutToLunch	op amp set up with non-inverting gain of 2. To get the full range of 0 to 12V, though, you're going to have to bias the op-amp from somewhat higher than 12V on the Vdd end and somewhat lower than 0V on the Vss end. You could go for a rail-to-rail op-amp - at least that would get you close to the rails without having to change the power supply.

24th July 2006, 09:36 PM	(permalink)
Hero999	Yes, use an op-amp, PICs may be good for complex applications but for something simple like this you can't beat an op-amp. I think PICs are often over-used these days, people often use them because they don't know how to do it the "propper way". __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.