AU-X1

[Ronito6]

The testing process will be quite the education.

As much detail as possible on testing would be very appreciated.

 

[smurfer77]

Keep it coming. I'm about to dive back into my AU-X11 over the break so we can have side by side AU-X1/II threads going!

 

[onwardjames]

Sweet machine, and sweet work. Great job.

 

[Willy6]

The testing process will be quite the education.

As much detail as possible on testing would be very appreciated.

I don't know my way around an oscope enough to do further testing on my own but I don't see any oscillation with my dmm.After I set the dc offset to zero I turned the power amp level all the way up on both left and right channels and then slowly turned up the volume and both channels didn't move from zero.If there was any oscillation going on my dmm readings would have started jumping around.

 

[Ronito6]

Thanks!

I didn't know that was a way to test for it.

I'll give it a try on my unit.

I'm in the same boat as regards the use of an oscilloscope BTW.

I have an oscilloscope, a signal generator, and I a dummy load ready to be put into service. But the details of set up and how to interpret results are still above me for now.

So I await the input of one of the AK past-masters to lend a hand here on this thread as things progress.

I expect I will be learning a lot about O-scopes here pretty soon.

 

[Willy6]

Thanks!

I didn't know that was a way to test for it.

I'll give it a try on my unit.

I'm in the same boat as regards the use of an oscilloscope BTW.

I have an oscilloscope, a signal generator, and I a dummy load ready to be put into service. But the details of set up and how to interpret results are still above me for now.

So I await the input of one of the AK past-masters to lend a hand here on this thread as things progress.

I expect I will be learning a lot about O-scopes here pretty soon.

I have an oscope,signal generator and dummy loads also but I'm not sure what a healthy wave form looks like but I know my dmm doesn't lie.If you have two dmm's hook one to the left speaker terminal and one to the right if not just check each one separately.

 

[JOMARK911]

I don't know my way around an oscope enough to do further testing on my own but I don't see any oscillation with my dmm.After I set the dc offset to zero I turned the power amp level all the way up on both left and right channels and then slowly turned up the volume and both channels didn't move from zero.If there was any oscillation going on my dmm readings would have started jumping around.

Not necessarily

 

[smurfer77]

I don't know my way around an oscope enough to do further testing on my own but I don't see any oscillation with my dmm.After I set the dc offset to zero I turned the power amp level all the way up on both left and right channels and then slowly turned up the volume and both channels didn't move from zero.If there was any oscillation going on my dmm readings would have started jumping around.

Circuit oscillation is a high frequency phenomena which you might not pick up with a DVM.

Also, you might need input. Oscillation is sometimes generated spontaneously (from self generated component noise) without input but is often seeded from input signal which either creates high frequency content via non-linearity of the components or contains high frequency within. Transients from flipping front panel switches can injet high frequency signals too.

A scope capable of going out to a couple of hundred kHz, and with FFT, really helps to observe the onset features of oscillation.