Hello,
I'm using a dsPIC from Microchip for the first time, and just for fun, I've got an old quartz crystal with two electrodes and a glass enclosure. I'm not sure if the nominal freq. printed on the side (4.8 MHz) of it is accurate/correct. I've configured the PIC to give me a working freq. of 10 MHz. To test this, I'm toggling a digital output whose period is 60 ms.
I don't have a real scope, so I've been experimenting with sound card pc oscilloscopes. Of the many out there, I've found Zelescope to be the best (not free, $10).
Anyways, here is a screen capture. The square wave starts to decay to zero after it switches levels. So there is a high pass filter inside the sound card blocking DC? Can someone offer more insight here?
I'm using a dsPIC from Microchip for the first time, and just for fun, I've got an old quartz crystal with two electrodes and a glass enclosure. I'm not sure if the nominal freq. printed on the side (4.8 MHz) of it is accurate/correct. I've configured the PIC to give me a working freq. of 10 MHz. To test this, I'm toggling a digital output whose period is 60 ms.
I don't have a real scope, so I've been experimenting with sound card pc oscilloscopes. Of the many out there, I've found Zelescope to be the best (not free, $10).
Anyways, here is a screen capture. The square wave starts to decay to zero after it switches levels. So there is a high pass filter inside the sound card blocking DC? Can someone offer more insight here?
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