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PC USB scope project.
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Old 13th August 2019, 05:34 PM   #81
nigelwright7557 is offline nigelwright7557  United Kingdom
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Built up another couple of usb scope pcb's.
One was the 4MHZ sampling PIC32MZ and the other was the PIC32MX 16MHz sampling scope. Both worked first time. So getting better at SMD soldering.
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Old 13th August 2019, 05:57 PM   #82
johnsurnamerobinson is offline johnsurnamerobinson
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Nice one nigel. No one should be without a scope these days esp amp constructors !!!
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Old 17th August 2019, 10:06 PM   #83
nigelwright7557 is offline nigelwright7557  United Kingdom
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Revisited a dual channel usb scope that ran at 1 million samples/second.
I had a read through the PIC32mx datasheet on the A2D.
It seems you can scan in hardware the A2D ports.
Took a while to figure out all the register settings to get it working.
It scans the A2D inputs sequentially and sets an interrupt flag when finished.
Clearing the interrupt flag starts the next samples.
I can now get 3.2 million samples/second.
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Old 19th August 2019, 04:06 AM   #84
anatech is offline anatech  Canada
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PC USB scope project.
That's excellent Nigel. Time for a dark one down at the pub?

-Chris
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Old 19th August 2019, 07:12 PM   #85
johnsurnamerobinson is offline johnsurnamerobinson
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Only one word of warning I used scopes during the development of hv + hf ignitors.Result big bang !!!. Computer inputs are very sensitive to EMC.
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Old 19th August 2019, 08:50 PM   #86
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by johnsurnamerobinson View Post
Only one word of warning I used scopes during the development of hv + hf ignitors.Result big bang !!!. Computer inputs are very sensitive to EMC.
I blew up a scope with the primary side of a car ignition coil many years ago.
The spikes can be many hundreds of volts.
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Old 20th August 2019, 07:22 AM   #87
johnsurnamerobinson is offline johnsurnamerobinson
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I had a scope dongle about 25 yrs ago it was ok i guess.Thing is when working with audio amps a scope is like eyes for the blind.
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Old 21st August 2019, 08:40 PM   #88
nigelwright7557 is offline nigelwright7557  United Kingdom
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USB scopes are ok so long as they are fast enough for audio.
At first thoughts up to 100KHz should be fine but if the amp oscillates it could be into MHz. I found on a 100KHz scope the oscillation showed up as mush on the signal, so at least something showed up.
Sampling rates and bandwidth can get a bit confusing.
While you might have a 50MHz sampling scope it is probably only good for 1MHz sine waves. It takes about 50 points to start getting a half decent waveform.
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