oscillations IN OPAMP help ????

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prorms

Member
Joined 2006
IAM GET A HISS OR TV SOUNDING NOISE ON LOW VOLUME
THAT SOUND WHEN DO NOT FIND A CHANEL
ITS ABOUT 5 WATTS LOUD AMP ABOUT 100 WATTS
IAM USING OPA134
i AM GUESSING need a capitor were the arrow points to not sure on the value
also ihave pin 1 and 8 floating nc
 

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Jan Dupont

Jan Dupont

Member
Joined 2003
audiocircuit.dk
Just a few things

The cap you mention would have no influence on noise you describe.....
Pin 1 and 8 are for offset trim and has nothing to do with you hum....

Whats the value of the resistors used ?
Are your circuit placed inside the preamp case or in a separate closed metal case ?
What kind of Power Supply do you use ?
How are the ground connections made ?
 
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