Always get the positive voltage from two inputs

Other Hardware General Electronics
1

I have one input, which will swing from -5V to +5V, and an inverting op amp, so there will always be one positive voltage output. The inverting amplifier have a gain of 1. So if the input is +2V, the inverting op amp will be -2V, and vice versa.

I want to compare the two values using an op amp and therefore only get the positive output, but I am not sure how to design the diagram.

Your help is appreciated

2

What do you mean by compare the two? The input and the output of the inverter? And waht do you want to output? Do you want 5V and -5V to both output 5V?

Where is that signal coming from? Can't you just rectify it?

3

Hi,
Do you have an OUTPUT that swings from +5V to -5V to an INPUT ?

Do you just want the positive part of the input signal?
That is the +5V part to 0V?

If so why not use a diode?

Can you draw a diagram of your +5V to -5V signal and what you want as the resulting output?

Thanks.. Tom.. :slight_smile:

4

Bassusour:
I have one input, which will swing from -5V to +5V, and an inverting op amp, so there will always be one positive voltage output. The inverting amplifier have a gain of 1. So if the input is +2V, the inverting op amp will be -2V, and vice versa.

I want to compare the two values using an op amp and therefore only get the positive output, but I am not sure how to design the diagram.

Your help is appreciated

Google 'opamp precision rectifier'