Post Go back to editing

Heat problem in AD811ANZ

Hello all,

    I am using AD811 in my amplifier circuit.In this circuit ,I am giving 1V sine ,triangular and square wave signal at 10Hz to2MHz  to the input of amplifier.If I  use this IC ,over a  long period of time ,it produce the heat on the surface of the IC.Eventhough I got a good  output response form this IC .If  I use this IC continuously  the heat problem completely affect the IC of  functionality and it will lead to IC dead.

Hereby, I attached the my amplifer circuit for your reference.

Please suggest the good solution for this problem.

Thanks with Regards,

Newengg

Parents
  • Newengg,

      Your feedback resistor is way too high.  I would suspect it is oscillating.  Put a scope on the output.

    Also, you need a cap, say 10uF, on the wiper of R1.  If there is no noise on the -15V, but 2mV on the

    +15V, and the pot is centered, you will have 1mV noise on the wiper which goes directly into your

    signal path.  The LM324 will have drift with temperature, so you probably can eliminate the op amp

    entirely.  If you don't need a large adjustment range, make R6 ten times larger.

    Harry

Reply
  • Newengg,

      Your feedback resistor is way too high.  I would suspect it is oscillating.  Put a scope on the output.

    Also, you need a cap, say 10uF, on the wiper of R1.  If there is no noise on the -15V, but 2mV on the

    +15V, and the pot is centered, you will have 1mV noise on the wiper which goes directly into your

    signal path.  The LM324 will have drift with temperature, so you probably can eliminate the op amp

    entirely.  If you don't need a large adjustment range, make R6 ten times larger.

    Harry

Children
No Data