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  • rakrupski commented on MaxPower1977's instructable How to Make a Propane Forge2 weeks ago
    How to Make a Propane Forge

    I built a propane forge, but instead of cutting an old propane cylinder, I used a stainless steel cooking pot: https://www.amazon.com/gp/product/B000E62GRUUsing soft firebricks to make a rectangular chamber, then wrapping it in 2 layers of Kaowool makes a cube that fits perfectly in the 13 inch diameter pot. The rear of the cube is also insulated from the rear (bottom) of the pot with 4 inches of Kaowool cut into 13 inch diameter circles.Then, the propane plumbing is attached to the rear of the pot for mechanical stability and there you have it... a forge with almost no cutting required (aside from the hole for the burner and the small holes for the screws in the rear).I did later cut a rectangular hole in the lid of the pot to cover the front - but this is not really necessary.

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  • Bit banging step-by-step: Arduino control of WS2811, WS2812, and WS2812B RGB LEDs

    Awesome! You are the man! I've been trying to write a bit-banger driver for these LED's (my son wants RGB LED strips in the front of his PC that cycle all kinds of different patterns and colors) and I was having a terrible time trying to get accurate delays. I built a little ATTiny85 board with a 24 mHz. (!) crystal and still could not get accurate, short pulses.My mistake was trying to do it in C rather than ASM. Thanks so much... you've made a little slice of my life easier!

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  • rakrupski commented on danielknox's instructable LoRaWAN Gateway5 months ago
    LoRaWAN Gateway

    Your project is very nicely done. Both thumbs up!I do, however, have a few comments:(1) It may be better to change a few dimensions and avoid using the right angle adapter for the GPS antenna. Every connector and adapter adds insertion loss. The right angle adapter wastes a bit of your sensitivity.(2) The R-Pi mounting plate does not need to be laser cut. A small hand saw and about 10 minutes of careful work will yield the same thing. When I make internal mounting plates for boards (to avoid placing holes directly in the enclosure), I either use screws to attach the plate to the enclosure standoffs, or if there are no standoffs, I solvent weld the plate to the enclosure using tetrahydrofuran. For less permanency, I use double sided foam tape instead.(3) Question: The Wi-Fi antenna and...see more »Your project is very nicely done. Both thumbs up!I do, however, have a few comments:(1) It may be better to change a few dimensions and avoid using the right angle adapter for the GPS antenna. Every connector and adapter adds insertion loss. The right angle adapter wastes a bit of your sensitivity.(2) The R-Pi mounting plate does not need to be laser cut. A small hand saw and about 10 minutes of careful work will yield the same thing. When I make internal mounting plates for boards (to avoid placing holes directly in the enclosure), I either use screws to attach the plate to the enclosure standoffs, or if there are no standoffs, I solvent weld the plate to the enclosure using tetrahydrofuran. For less permanency, I use double sided foam tape instead.(3) Question: The Wi-Fi antenna and GPS antenna share the same ground plane (mounting bracket). Is it important to consider the SPACING between them?

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