Re: W7ZOI/KAEMX Schematic


N5IB
 

Hi Richard,

I don't have permission to post or distribute the power meter schematic, since that's copyrighted material. I'll have to refer you to the June 2001 issue of QST for the article.

The dc voltage fed to the A/D input of the Arduino is taken from the output of an op amp that buffers the AD-8307 output. The input impedance of the A/D is fairly high, so you can have a few K series resistance. You can choose the gain setting resistors on the op amp to make your voltage span match the A/D reference.

Jim, N5IB

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