| Electronics > Projects, Designs, and Technical Stuff |
| 4 channel ADC, 10 MHz, 8 bit design |
| << < (6/8) > >> |
| StillTrying:
"10 MHz analog bandwidth would be nice." Should be quite possible. I think the trick is to keep the red track as short (mm) and capacitance free as possible, so that you get to choose the value of the feedback cap. - in theory. :) |
| FrankBuss:
I finished the layout: Luckily someone on the kicad.info forum mentioned the these plugins: https://github.com/MitjaNemec/Kicad_action_plugins/ Has "replicate layout", which places all components of all sub-sheets in a configurable distance and duplicates all traces, and it has the swap-pins script, which I really missed from Eagle. I think now KiCad is perfect :) Minor changes for the schematics are in github, too, with updated PDF files. Will do a flood-fill on the bottom for GND, add labels, make supply traces bigger etc., and then it should be done. |
| StillTrying:
You've moved TP1 to the other side of the 150k input resistance. |
| FrankBuss:
Right, I thought I wouldn't need it at the other side, because I can always connect a scope to the input pin header, together with the input jumper wire, and would be more interesting to see what happens at the inputs of the OpAmp. I ordered the boards this week, I should get it in 1-2 weeks. The final layout is in the github repository. Looks like this: I did a GND flood fill on bottom and 5V flood fill on top, except for the input at the left, because I guess if there is noise on the 5V, it could couple into the input signal. Maybe for the final version a 4 layer board would be better, so that I can use a dedicated +5V / +3V power layer? |
| StillTrying:
"would be more interesting to see what happens at the inputs of the OpAmp" There'll be nothing happening at the inputs of the op amp, until you connect a probe. then it will oscillate. :) |
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