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How to promote an USB oscilloscope to individual engineers? I am the Loto instru
trobbins:
are you saying the noise is lower when you use a battery/linear reg to provide 5v rail compared to that dc/dc module?
do you have enough pcb room to add typical datasheet LC filtering, or even local C filtering?
jiangtao.lv:
The vendor of power module recommend no LC filtering, because that will change its load character.I only use several C. I did not try battery/linear reg , because I need -5v power supply. I did try a TI LDO to supply -5V, it's not good enough. I'm satisfied with this power module till now.
brabus:
I like that PCB! Looks very neat. :-+
Some things I would do differently:
- That large D-Sub connector looks so outdated, not to mention the limited number of insertions. Sure a nice Molex board-to-board connector would be way nicer;
- C6 and C10. Are those variable caps? What are they adjusting, exactly? I never saw anything adjustable on a board since a long time.
Keep up the good work! :-+
jiangtao.lv:
Thanks brabus:
I used two 37 Pins D-sub connectors as you see, it indeed limit my extension, I use every pin now with no one spare. Users are not suggested to disassemble and install this module too often, so the main consideration is the price factor in my choosing this connector. Honestly, a couple of these connectors takes me less than 0.5 $. I put a picture in the attachment about what it looks like in the final.
C6 and C10 are used in the signal input attenuation network. In a low frequency input situation, I can regardless of the caps, but in a high frequency situation, i need to adjust them right as a factory calibration before ship to customers. Show in attachment:
tszaboo:
As this is clearly a toy, I suggest going after the maker market, not professional engineers.
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