I want to shift an input voltage of the range -5V to +5V into the range 0 to +10V.
My plan is to feed the input into a two input inverting summing op amp. The other input will be fed +5V so that the other voltage is always shifted up into the desired range.
My question is what is the best source for a precise 5V? Should I use an LM317?
Thanks I looked at that tutorial before but the example fails if you input the values I used.
e.g.
Input signal ranges from -5 to +5V, scaled to range 0-10V
V1 = -5V
V2 = 5V
Va = 0V
Vb = 10V
G = (10-0)/(5-(-5)) = 1
Vy = 0-1(-5) = 5
Vt = 5/1-1 = 5/0 DIVIDE BY ZERO NOT POSSIBLE
However if I use an inverting summer with two inputs and gain of 1 it is easy:
input 1 is the +/-5V signal. Input 2 is the 5V reference voltage (which is really what my question is about. If I used voltage divider it is not accurate enough)
Output of this summer can then be inverted with another opamp stage.
So again my question is: what should I use as the voltage reference?
p.s. My power supply is a regulated +/-12V. I also want to use as few components as possible.... should I just use precise resistors as voltage dividers???