Oscillation with TL084 as voltage buffer

Daniel Almeida

Other Parts Discussed in Thread: TL084, LM4766

Hello everyone,

I've made a TL084 voltage buffer to use with a TDA7297 power amplifier, but the buffer is oscillating at low frequencies at the startup, can someone sugest me other opamp or some measure to solve this problem, the circuit scheme is attached.

Thank you very much for your atention,

Best regards,

Daniel Almeida

over 12 years ago

0 Don Dapkus over 12 years ago

TI__Guru**** 189399 points

Hi, Daniel,

Clearly you should not be trying to drive an ST part with a TI op amp! You should clearly be using something like the LM4766!

Seriously, I am not sure I understand the issue. Can you post a scope shot of the oscillation you're seeing?

-d2

0 Daniel Almeida over 12 years ago in reply to Don Dapkus

Expert 1010 points

Thank you very much for your help,

I will try the LM4766, this amplifier can be used with an unregulated power supply?

Thank you for your atention,

Best Regards,

Daniel Almeida

0 Daniel Almeida over 11 years ago in reply to Daniel Almeida

Expert 1010 points

Hello everyone

The problem is solved, the IC was with problems in ground connection, know it works perfectly.

Best regards,

Daniel Almeida

0 Don Dapkus over 11 years ago in reply to Daniel Almeida

TI__Guru**** 189399 points

Hi, Daniel,

Thank you for providing us feedback! Often times, we never hear back.

-d2

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Oscillation with TL084 as voltage buffer