# Argon solid red LED?

**URL:** <https://community.particle.io/t/argon-solid-red-led/55457>\
**Category:** Hardware\
**Tags:** argon\
**Created:** [April 1, 2020, 4:24pm UTC](https://community.particle.io/t/argon-solid-red-led/55457 "2020-04-01T16:24:48Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![natedog](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/natedog/32/19393_2.png) [@natedog](https://community.particle.io/u/natedog)\
**Post date:** [April 6, 2020, 11:18pm UTC](https://community.particle.io/t/argon-solid-red-led/55457/5 "2020-04-06T23:18:07Z")

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I’ll comment as I’m the one that designed the hardware. 🙂. The PWR\_FLAG marker is an idiosyncrasy of Kicad, its a requirement to label any net supplying power with it to pass ERC.

I did follow the calculations and layout guidelines for the mcp16301 closely, although I will likely go through it all again. I do not have any decoupling caps on the argon side, Vusb has its own 0.1uf on the argon itself which I thought was enough. Perhaps that was a poor assumption.

I suspect it could be the saturation current rating of the inductor, I will have to go through some datasheets again when I get home tonight.

I did design the power supply with a 12v input in the calculations, and the battery is actually as high as 13.3v fully charged I think.

Yeah… I should add a diode OR to vusb.

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