Is it possible, that this noise is transferred from the power supply? On Pin 18 of the Audio drive board i have a full rectangular signal. The Audiodriver is disabled, i have no low voltage injected. My ground is the chassis ground. If i remove the ground and touch with my tip on the middle section of the audio drive board, i have everywhere this amplitude from the power supply.
Pin 18 is connected to the output of the LM211, if I'm not mistaken.
You can't rely on anything an isolated scope tells you if it has no ground reference.
You can't rely on anything an isolated scope tells you if it has no ground reference.
If i connect the scope ground to the rca shield, and touch with my probe to pin 1 of tl072, the noise changed and it reduce.
no, then it doesnt change. I have a triangular signal on pin1 of tl 072. Pin2 and 3 seems to be nothing.
I had a similar problem this weekend. Only to find out my battery couldn't deliver the current needed. Voltage seems fine when you measure, but with a load it drops drastically, charged up the battery and the weird noise was gone.
Hello, i use a effection x 700. I have allready charged, and now again. The voltage is ok. It doesnt drop bellow 12,3V. At the moment i have a low voltage supply for the audio part. I dont want to give more, because before it was drawing it lot of amps. Also what make me weird, sometimes the noise disapear and then starts agin.
I had the same issues thinking there was something wrong with the amplifier. The current draw on these amplifiers are 3.5 amps on idle. I'm not sure sure what you mean by you don't want to give more. If you are drawing more than that on idle then there's something still faulty.
23 amps on idle is ridiculous. You spending time looking for a noise when you got bigger problems.
You can replace everything on the driver board that makes it a new board. I can help you with every component you need to know.
I changed allready nearly everything, but the technician before damaged a lot of traces. So i think there maybe another problem on that board.