Hello,
I have a soundfield microphone, and the processor box has a small problem :
After powering up (it had been off a few weeks) there was a lot of noise and distorted sound.
After switching on and off the problem was gone, but the next day it did that again. It seems that it disapears when the unit has been on for some time...
I found the opamp that seems to be the trouble. When the unit is in "faulty" mode it measures about dc 15 volts at its inputs.
Also when you touch the opamp it crackles louder.
Would you think the interstage capacitor is too old or the opamp is broken ?
My guess is the capacitor because i cannot get the unit too fail anymore since it has been on a few days in a row.
Very annoying because this way it cannot be repaired.
What would you suggest to do ?
BTW the unit is smd so that's another problem. It's easier to swap the capacitor than the opamp.
All suggestions are very welcome.
Thanks in advance, Hans
I have a soundfield microphone, and the processor box has a small problem :
After powering up (it had been off a few weeks) there was a lot of noise and distorted sound.
After switching on and off the problem was gone, but the next day it did that again. It seems that it disapears when the unit has been on for some time...
I found the opamp that seems to be the trouble. When the unit is in "faulty" mode it measures about dc 15 volts at its inputs.
Also when you touch the opamp it crackles louder.
Would you think the interstage capacitor is too old or the opamp is broken ?
My guess is the capacitor because i cannot get the unit too fail anymore since it has been on a few days in a row.
Very annoying because this way it cannot be repaired.
What would you suggest to do ?
BTW the unit is smd so that's another problem. It's easier to swap the capacitor than the opamp.
All suggestions are very welcome.
Thanks in advance, Hans