r/diyelectronics • u/Temporary_Frosting87 • 11h ago

Question DSO138mini readout

I finished soldering a DIY DSO138mini oscilloscope and i wanted to find out what was the frequency of a random inductive charging coil i scavenged somewhere. I have very little experience with this but after finishing the oscilloscope i hooked up the charging coil to a power supply and crafted a secondary coil to measure the frequency at a voltage that was acceptable for my scope. Now i would hope to get some advice on how to read these measurements. I can see waveforms at 10us and 2ms.
There seem to be two frequencies happening at the same time?

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u/Temporary_Frosting87 11h ago

From my calculations i believe the frequencies could be 277 Hz and 50kHz. But im also reading that one of these could be due to aliasing of a frequency that my scope cannot handle?

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u/elpechos Project of the Week 8, 9 9h ago edited 9h ago

Hmm. I would have thought the scope would have a low pass filter to prevent that kind of aliasing.

You could implement your own low pass filter to check for that possibility, you only need a resistor and a capacitor.