variable volume op amp

T

terrapinlogo

Member

• Dec 26, 2008

• #1

hi i dont know much about op amps just there basic operation and was woundering if someone could point me to a scematic of an audio amp
thanks

 

audioguru

Well-Known Member

Most Helpful Member

• Dec 26, 2008

• #2

There are thousands of opamps. Nearly every datasheet has the spec's and the schematic.

What does the schematic of an opamp got to do with a variable volume??

Here is the schematic of Texas Instruments uA741 opamp:

 

Attachments

• 741 opamp schematic.PNG

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T

terrapinlogo

Member

• Dec 26, 2008

• #3

no i want to use an op amp in an amp. i tried to connect the input and out put direct but it was distorted so i guess i need some extra parts.

 

audioguru

Well-Known Member

Most Helpful Member

• Dec 26, 2008

• #4

You need to learn about opamps.
An opamp has a voltage gain of about 200,000 so it needs to have negative feedback added to reduce it to a reasonable amount. Two resistors make the negative feedback.

 

T

terrapinlogo

Member

• Dec 26, 2008

• #5

can you supply a scematic?

 

audioguru

Well-Known Member

Most Helpful Member

• Dec 26, 2008

• #6

terrapinlogo said:

can you supply a scematic?

Click to expand...

I don't know what is a "scematic". Maybe you don't know how to spell English words.

I attached the schematic of the uA741 opamp from Texas Instruments in my first post here.

Maybe you want a schematic of an opamp that has negative feedback.
Look here, its voltage gain is 2.0.

 

Attachments

• opamp.PNG

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