op-amp supply question...

Thread Starter

WAN24

Joined Jun 27, 2006
21
this is a simple question, but im not sure...can two op-amps share a single supply? :confused:

tnx..
 

thingmaker3

Joined May 16, 2005
5,073
Yes. The number of op-amps which can share a single supply is only limited by the current the supply can source.
 

Thread Starter

WAN24

Joined Jun 27, 2006
21
tnx for the reply sir..
if im gonna use 3 to 4 op-amps.. what current rating of the transformer should i use? coz im trying to make a power supply for those op-amps... again. tnx..
 

beenthere

Joined Apr 20, 2004
15,808
The op amp spec sheet will tell you the current each can be expected to use. If your supply can source 100 milliamps on both supply rails, then it should be adequate. It's always a good idea to check the requirement of the op amps, though.
 

SgtWookie

Joined Jul 17, 2007
22,201
What knightofsolamnus is referring to is the practice of connecting small capacitors (usually 0.1uF) from the op amps' supply pins to the ground pins. If you are using single-supply (only V+ and ground) op amps, connect a single 0.1uF capacitor from the V+ pin to the ground pin.

You will need more than just a transformer; you will need a regulated power supply. If you don't have one, you could build one from a left-over computer power supply.
 
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