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Thanks for all the pictures, these will be helpful.
It is always difficult to read an unfamiliar oscilloscope, so I may need some help.
1. What does it mean that "Amplitude Channel 2" is grayed out / disabled? Are both channels the same volts per div?
2. What does the amplitude dial actually determine? For example, a label says "[1/Div]", but there is also an amplitude "value" that reads "60m" or "500m" for example. What exactly do these refer to?
If we label your pictures 1 through 7, my first observation in picture 1 is that I see waveforms with a period of approx .25 sec, or 4 Hz. However in picture 3, the same waveforms seem to have doubled frequency to about 8 Hz. Is that consistent with what you hear in the beeping?
In pictures 6 and 7, we see waveforms with periods of about 50 mS, or about 20 Hz. Is this what you hear, beeping that varies from 4 Hz to 20 Hz?
3. In picture 4, would you explain exactly what points you are measuring in both graphs and what you mean by "nothing connected"?
Observations:
1. From picture 1, we see "beep" signals in one channel, but no audio. This should mean the speaker is not causing feedback. The speaker is the main component that might drag down the supply voltage.
2. Small short spikes on the supply voltage rails are not necessarily a problem -- they are often present in a normal working TGSL and you would expect them when the speaker sounds.
3. The most interesting thing is that the oscillations are present on the lower channel even with big overlap of your coils. I think we need to focus on that channel in that case and see what we can find.
-SB
It is always difficult to read an unfamiliar oscilloscope, so I may need some help.
1. What does it mean that "Amplitude Channel 2" is grayed out / disabled? Are both channels the same volts per div?
2. What does the amplitude dial actually determine? For example, a label says "[1/Div]", but there is also an amplitude "value" that reads "60m" or "500m" for example. What exactly do these refer to?
If we label your pictures 1 through 7, my first observation in picture 1 is that I see waveforms with a period of approx .25 sec, or 4 Hz. However in picture 3, the same waveforms seem to have doubled frequency to about 8 Hz. Is that consistent with what you hear in the beeping?
In pictures 6 and 7, we see waveforms with periods of about 50 mS, or about 20 Hz. Is this what you hear, beeping that varies from 4 Hz to 20 Hz?
3. In picture 4, would you explain exactly what points you are measuring in both graphs and what you mean by "nothing connected"?
Observations:
1. From picture 1, we see "beep" signals in one channel, but no audio. This should mean the speaker is not causing feedback. The speaker is the main component that might drag down the supply voltage.
2. Small short spikes on the supply voltage rails are not necessarily a problem -- they are often present in a normal working TGSL and you would expect them when the speaker sounds.
3. The most interesting thing is that the oscillations are present on the lower channel even with big overlap of your coils. I think we need to focus on that channel in that case and see what we can find.
-SB
I am just using it for a few days
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