I have done projects in school mainly using power supplies with more than 6 terminals, so i know how to do a split supply on these PSUs,
But now i want to invest in a 3 terminal power supply. Do i just connect each pin with the corresponding pin on the opamp? Don't we need two +/- supplies for dual supplies ? I'm confused

 

what to you mean by "3 terminal power supply" - you mean "3 terminal voltage regulator"?
you can use two separate supplies and wire them as a dual supply (required that output is floating).
you can also make dual supply and regulate both positive and negative rail using one positive and one negative regulator.

 

If it is 3 terminal regulator you would need two regulators. One for positive (ex: 7812) and one for negative (ex: 7912).

 

thanks for ur replies .I mean a Power supply . with one positive rail, one negative rail and Ground. Do i need two positive rails, two negative rails to supply an opamp ? In other words , can i use an opamp in dual supply configuration with the first picture or do i need the second one?

 

what to you mean by "3 terminal power supply" - you mean "3 terminal voltage regulator"?

He probably means a 3 terminal power supply as in Ground and two outputs.

Kind of like this:

http://www.mouser.com/ProductDetail...GAEpiMZZMtd%2b2RMOh0Ly3/wwR7OMCIBrGyzDN9dElE=

 

To Power dual power supply OPAMPS u need this one

 

The green terminal is not ground. It is an Earth connection,
I have the first one and I know
To power opamps you cannot use the green terminal.
You need to series connect the two PSU. That way you will get +ve, GND and -ve

But you need to make sure that what you are buying have two isolated PSU's

 

To power opamps you cannot use the green terminal.
You need to series connect the two PSU. That way you will get +ve, GND and -ve

But you need to make sure that what you are buying have two isolated PSU's[/QUOTE]

great thanks, That answered my question.