oscillations IN OPAMP help ???? - diyAudio
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Old 30th September 2007, 03:11 AM   #1
prorms is offline prorms  United States
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Default oscillations IN OPAMP help ????

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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Old 30th September 2007, 03:13 AM   #2
prorms is offline prorms  United States
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this 2 schematics are in preamp
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Old 30th September 2007, 05:23 AM   #3
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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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Old 30th September 2007, 12:17 PM   #4
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Quote:
Whats the value of the resistors used ?
Yes, what is the value of the resistors used/gain.
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