I would like to clarify the resistor value specified as "R1, 330M" in the BOM for the 0402 package. Does it represent 330 MΩ (megaohms) or 330 mΩ (milliohms)? We have only been able to find a maximum of 20 MΩ for the 0402 package, while the 330 MΩ resistors we found are typically in the 0603 package.
If a 330 MΩ resistor is indeed available in the 0402 package, could you please provide a link to it? I would greatly appreciate it.
Thank you for your assistance.
@bernhard-zimmermann @dboas I hope this message finds you well. I wanted to kindly follow up on my previous inquiry regarding R1-0402 Package Resistor Value in BOM_Block_NN23_Det_Optode_02_OPA, which I mentioned. I understand you may be busy, but I would greatly appreciate it if you could provide the information when convenient.
Thank you in advance for your help, and I look forward to your response.
Since I have not yet received a reply, I proceeded to run some preliminary tests with available resistor values to better understand the circuit's behavior:
With 100 Ω, the signal performance was unsatisfactory.
With 10 MΩ, the signal appears to be functional and acceptable.
Based on these results, I suspect that the intended value might be somewhere around the high kilo-ohm or low mega-ohm range (e.g., 10 MΩ or 20 MΩ), but I would greatly appreciate your confirmation to ensure that I am using the correct value as originally intended.
I look forward to your clarification, as it would help us move forward with our implementation. Thank you very much for your assistance! @bernhard-zimmermann @dboas
@walden Hi, I'm also curious about this. As far as I understand, the resistance of R1 directly corresponds to the gain of the module (voltage at OUT / current at pin 4 of OPA810).
However, since I’m not sure what the expected photocurrent range of the VEMD5060 is in this particular system, I’m uncertain whether it’s appropriate to change the gain value arbitrarily.
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