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30th September 2007, 03:11 AM
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#1 |
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diyAudio Member
Join Date: Nov 2006
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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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30th September 2007, 05:23 AM
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#3 |
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diyAudio Member
Join Date: Apr 2003
Location: Copenhagen, Denmark
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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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30th September 2007, 12:17 PM
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#4 | |
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diyAudio Member
Join Date: Nov 2002
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Quote:
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