Author Topic: Getting symetrical voltages from single suppley for opamps  (Read 1909 times)

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Offline MAntunesTopic starter

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Getting symetrical voltages from single suppley for opamps
« on: November 30, 2015, 06:47:24 pm »
Hello, my name is Miguel and I am from Portugal. Sorry in advance for my english.
I was looking for the best way to get symetrical voltages from one single voltage to bias op amps. Getting -/+5V with a 10 or 12V supply for example.
First I thought of a voltage divider, with just two resistors. But than I realized that it could became instable.
Then it came to my mind that I could use linear regulators like 78xx and 79xx.
Can you help me in finding the best way?
Thank you in advance for your help.

Miguel
 

Offline max666

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Re: Getting symetrical voltages from single suppley for opamps
« Reply #1 on: November 30, 2015, 07:00:54 pm »
I don't know about the best one, but this might be a good start http://tangentsoft.net/elec/vgrounds.html
[Sauce]
 

Offline 0xdeadbeef

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Trying is the first step towards failure - Homer J. Simpson
 

Offline MarkL

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Re: Getting symetrical voltages from single suppley for opamps
« Reply #3 on: November 30, 2015, 07:13:02 pm »
There is a part that does exactly what you want, also known as a "rail splitter":

  http://www.ti.com/product/tle2426
 

Offline MAntunesTopic starter

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Re: Getting symetrical voltages from single suppley for opamps
« Reply #4 on: December 02, 2015, 08:02:00 pm »
Thank you all for you help!
The rail splitter seems like a good idea. But the problem is its output current (max 20mA), but maybe combining it with a buffer could help raising the output current. Will do some tests!
 


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