Shifting 0--5V signal to -2.5--2.5V

by bassplayer142
Tags: 2525v, shifting, signal
bassplayer142 is offline
Jul16-10, 10:09 AM
P: 422
I have a DAC coming from my micro with a signal that will vary anywhere from 0-5Volts. What are my options of shifting that down so I can get a -2.5 -- 2.5V swing? Thanks!
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waht is offline
Jul16-10, 11:23 AM
P: 1,636
In a op-amp voltage difference amplifier, you could subtract 2.5V from the input:

bassplayer142 is offline
Jul16-10, 11:57 AM
P: 422
For this setup I will need to supply a positive voltage on pin 7 and a negative one on pin 4 right? thanks

uart is offline
Jul16-10, 12:07 PM
Sci Advisor
P: 2,751

Shifting 0--5V signal to -2.5--2.5V

Quote Quote by bassplayer142 View Post
For this setup I will need to supply a positive voltage on pin 7 and a negative one on pin 4 right? thanks
Yes, about +5 / -5 volts DC at a minimum.

There may be a much simpler solution but without a more detailed description of the nature of the signal then you mightn't get it.
AdrianN is offline
Jul16-10, 12:15 PM
P: 8
Yes, you need a bipolar power supply. Your circuit is a unipolar to bipolar converter. If interested, I have an article about this type of circuit here:

Design a Unipolar to Bipolar Converter for a Unipolar Voltage Output DAC
schip666! is offline
Jul16-10, 12:35 PM
P: 595
From your name, bassplayer, I'm thinking that you have an audio signal?

If it is over 10Hz or so, presuming that the destination is biased around 0v, you might be able to just put a big capacitor in the signal line. You might also get away with using a resistor divider to a negative supply voltage without bothering with an Op-Amp.

What's your actual application?
bassplayer142 is offline
Jul18-10, 09:44 AM
P: 422
Actually I'm working on a laser scanner system for light show with some mirror galvanometers. I don't have a datasheet on them or any type of function generator so having an easily adjustable supply will be great for finding the limits of operation. Thanks for all the posts, its been a great help!
schip666! is offline
Jul18-10, 01:30 PM
P: 595
Then they are pretty much just speaker voice coils, and a inline capacitor will do the trick. However you probably need more power than the PC output can push. Perhaps more than the PC headphone output too, but you could try that or a small powered speaker system for a start.

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