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Progressing with the signal acquisitions
02/27/2018 at 22:07 • 0 commentsSome good news again =)
I got to better control pulses (I need to really read more carefully datasheets), got acquisitions at 64Msps, really looking good, and got some (badly formed at the moment) images!
Acquisitions - going to specs at 64Msps. Thanks David =)
Pulser: getting 200ns wide 75V pulses (blue is the pulse with a piezo on, in yellow is the 'damping' control signal.
Getting some images from a "damaged" probe
More on the log!
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Getting great results
02/24/2018 at 19:43 • 3 commentsThat's moving forward! I'm getting some results with the following setup - using a piezo with a fixed distance, and a pulser at 25V.
Getting nice echoes (x-label in us)
The gain control works as well =)
and the FFT looks relatively clean!
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More hacks
02/11/2018 at 22:47 • 0 commentsI needed to replace some elements, some stuff is erratic, but hey, I've been able to set up all registers, run the analog part, and control the DAC gain. I (just) need to run the ADC now, the fpga still thinks s.he's not working ;)
Some pulse control works, and pulses too! With a 10x probe, on a 25V pulse
Next step.. digitalization. More on the log.
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Further tests
01/26/2018 at 20:23 • 0 commentsThe clock had to be removed!
Investigation showed no connection through USB.. a ftdi issue. Powers were OK.. but still nothing.
So what? Clock!!
I unfortunately destroyed the 12MHz clock.. well that's it =) I'll be waiting for the new one from digikey.
The clock has to be rotated by 90°
More on the next session !
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Let's have a first peek
01/26/2018 at 20:16 • 2 commentsThis has reached a couple of days ago =)
Looks good - ice40 and ram look good. The high-level pulser footprint seems reversed. The 3.3V is on, 5V level looks good, seems good!