The Desk of Ladyada - Pocket VNA, Crystals and Minerals and Blood moon

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Manage episode 328559718 series 1242341
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There's a full lunar eclipse tonight that you'll be able to see if you're in the eastern half of N America or in S America (https://moon.nasa.gov/news/172/what-you-need-to-know-about-the-lunar-eclipse/) if it isn't cloudy, go outside and look up! Or watch NASA's livestream. We also went to the NJ Rock, Gem, Mineral and Fossil show (https://nj.show/) yesterday with some Fruit Friends and picked up some really sweet gems - we'll show those off live under the overhead. Finally, we pulled out our pocket VNA we ordered many years ago to try it out - Once calibrated, you can use it to check antenna responsivity, we're also going to try to learn how to use it to tune our pi networks for boards where we DIY the RF section instead of using a module. The Great Search - 8 ohm 0.25W, 2" diameter round speaker https://www.digikey.com/short/3wnvzfm3 This week, we have a request from someone working on a kit with an an audio output - they need to spec out an inexpensive speaker that will play the audio clips in their design and they had a few rough requirements they wanted to hit: the audio driving circuit they're using is 8 ohms 0.25 Watt, so the speaker cant have have a lower power rating or it will blow out. The size is about 2 inches diameter, and it needs to be a round speaker to fit into the PCB. Finally, the audio frequency range is not that wide, we just need to play tones that are about 600 Hz. What You Need to Know about the Lunar Eclipse https://moon.nasa.gov/news/172/what-you-need-to-know-about-the-lunar-eclipse/ NJ Mineral, Fossil, Gem & Jewelry Show https://nj.show/ https://nj.show/exhibitor-list/ #adafruit #deskofladyada #bloodmoon Visit the Adafruit shop online - http://www.adafruit.com ----------------------------------------- LIVE CHAT IS HERE! http://adafru.it/discord Adafruit on Instagram: https://www.instagram.com/adafruit Subscribe to Adafruit on YouTube: http://adafru.it/subscribe New tutorials on the Adafruit Learning System: http://learn.adafruit.com/ -----------------------------------------

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