or Connect
Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › How to detect amplifier oscillations with and oscilloscope
New Posts  All Forums:Forum Nav:

How to detect amplifier oscillations with and oscilloscope

post #1 of 3
Thread Starter 

Dear All:

 

Do you know how to detect amplifier oscillations with and oscilloscope ?

 

I have connected my oscilloscope to an 75 ohm metal file resistor and a 10K metal film ressitors.

 

The LM4880 output sine wave is Ok. (Input voltage 1.2 vrms)

 

If the amplifier oscillates does the sine wave get distort?

 

Regards.

Alfredo Mendiola Loyola

Lima, Peru


Edited by mendiola - 6/8/14 at 8:13pm
post #2 of 3
This probably belongs in another category.
 
Anyway, a stable opamp should produce signal output with phase angle near 0 degrees (compare input to output). Oscillation also tends to produce harmonics, which are easiest to observe on an audio analyzer, or any oscilloscope with an FFT function. You'll see significant frequency content that should not be present.
Reply
post #3 of 3

If a chip opamp burns your finger when you touch it for a couple of seconds, it is definitely oscillating.

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Portable Headphone Amps
Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › How to detect amplifier oscillations with and oscilloscope