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  • JimG50 commented on Phil B's instructable Automotive Current Detector
    Automotive Current Detector

    Yes, good idea but maybe include a 7 or 8 V zener diode in series with the resistors. Two positive results, First, protection from reverse connection to a battery and second, a dead battery (<11V) won't light the LED

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  • Urban Rooftop Ham Radio Antenna

    I add my comments as a 64 year ham. By all means disconnect the coax at the window when a storm arises and get some distance. Only a slight chance of a lightning hit with surrounding buildings there, and your pictures didn't show all the building profile(s) but it can be devastating. I'm speaking from experience and 15K$ loss even though in Texas where everything is big, had 3, 8 foot ground rods at the tower base but it still got in the house. Second hit went within 4 feet of my 80 meter dipole to hit the TV antenna on chimney sure took out the coax and cable TV box! Same storm, Ham up the street took a hit blowing screws out of the walls so hard it deeply dented his refrigerator, set all the globes on the wagon wheel light fixture at a 45 Degree angle. Couple months later a fire from hi…

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    I add my comments as a 64 year ham. By all means disconnect the coax at the window when a storm arises and get some distance. Only a slight chance of a lightning hit with surrounding buildings there, and your pictures didn't show all the building profile(s) but it can be devastating. I'm speaking from experience and 15K$ loss even though in Texas where everything is big, had 3, 8 foot ground rods at the tower base but it still got in the house. Second hit went within 4 feet of my 80 meter dipole to hit the TV antenna on chimney sure took out the coax and cable TV box! Same storm, Ham up the street took a hit blowing screws out of the walls so hard it deeply dented his refrigerator, set all the globes on the wagon wheel light fixture at a 45 Degree angle. Couple months later a fire from his burned wiring in the attic caused lots of damage. Not to worry about RFI. With everyone's systems above 1200 MHz your Baofeng power is nothing to them. Maybe at 200-300 Watts VHF/UHF using China designed rigs might be an issue?

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  • Rotellino - 3€ Battery Free Contactless Bike Light

    Such a neat idea. Thanks. Just think, after some miles the wheel will become magnetized and if you let go of the handle bar the bike will turn due east! - Just kidding. 😜

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  • JimG50 commented on sqij's instructable LoRa Mesh Radio
    LoRa Mesh Radio

    Unless radio transmitting devices are designed to meet Part 15 (no license required), then 902MHz to 928MHz use requires a license. Amateur Radio stations are permitted to use power levels up to 1500 Watts. This means any device using 902-928 MHz must put up with interference as well as not interfere with licensed stations. Same goes for the 433 MHz band. - just saying.

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  • JimG50 commented on SEB TECH DIY's instructable 2X4s TRUCK RACK
    2X4s TRUCK RACK

    Neat idea and nicely done.

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  • Fire ant problem is easily solved by placing a teaspoon full of cornmeal by the ant mound entrance. They take it inside and it expands due to moisture and chokes off their passage. Make sure it doesn't rain the day you do this.

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  • When using an 18560 (only available battery at home) in low current applications, say, 10mAh, what is a good way to determine length of usable time? What is the recommended low voltage to begin recharging?

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  • JimG50 commented on OEsirik's instructable RF Transmitter and Receiver

    For info and books about Amateur Radio (Ham Radio) see ARRL.ORG. For equipment google ICOM, Yaesu, Kenwood or go on Ebay searching for amateur equipment. Or build your own. 73. JIm

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    • Low Current Li-Ion Battery Capacity Meter
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  • JimG50 commented on makjosher's instructable Bent Metal Coat Hooks

    Nice work. Be sure to spray with a clear coating to prevent rust.

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  • JimG50 commented on mikeasaurus's instructable Unusual Uses for WD-40

    Good input on general lube of WD-40. Another was to remove labels. I found if substrate can handle it, use a heat gun. On cardboard boxes I remove the shipping labels to reuse the box when needed. WD-40 would ruin the box.

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  • Perhaps a voltage clamp and R-C combo on the primary would assist in reducing arcs on the contacts and high voltage spikes. Otherwise used in 1920s to 50's on car radios.

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  • Neat idea to solder only one contact then place part first. Thanks.

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  • Found an occasional coconut oil wipe of brass doorknobs in this high humidity environment where knobs are exposed to sunlight keeps them shined up.

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  • Hi,For info I attended a Ham meeting last night where the guest speaker discussed flying balloons around the world. Amazing stuff. He described ten milliwatt transmitter chips bought from Texas Instruments using surface mount components and GPS for tracking from Blox - or a name close to that. The GPS must be able to work at high altitudes. All components were controlled by an ARM microprocessor. Amazing construction weighing only 20 Grams but so small required magnification to assemble to solder parts. With temperatures at 14 KM around -60C parts have to be reliable. Balloons were small, maybe a meter in diameter but filled to just provide a small amount of lift. Now if you want to have fun with a short duration flights at low levels, I suggest you google milliwatt transmitters that con…

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    Hi,For info I attended a Ham meeting last night where the guest speaker discussed flying balloons around the world. Amazing stuff. He described ten milliwatt transmitter chips bought from Texas Instruments using surface mount components and GPS for tracking from Blox - or a name close to that. The GPS must be able to work at high altitudes. All components were controlled by an ARM microprocessor. Amazing construction weighing only 20 Grams but so small required magnification to assemble to solder parts. With temperatures at 14 KM around -60C parts have to be reliable. Balloons were small, maybe a meter in diameter but filled to just provide a small amount of lift. Now if you want to have fun with a short duration flights at low levels, I suggest you google milliwatt transmitters that conform to your countries codes of frequencies allowed with no license. As well get to know some hams, get your license, and learn how to build to your requirements. Hams have free software allowing digital transmission of data. Google WSPR and FLDIGI are just two of many. Good Luck!

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  • Neat deal Spaceshark. I've been a ham 62 years starting at 14 years old and even made my career in electronics due to Ham Radio, getting patents and all that stuff, What is so interesting is the science of shortwave propagation, talking to other Hams around the world, using Ham satellites, building gear like you did plus hour upon hour of fun experiences and experiments. How about putting a small VHF transmitter on a balloon and finding how far it can be heard? The formula for line of sight on a curved earth could be checked out and I bet distances (DX) will be greater due to the bending of radio waves due to the atmosphere. In addition you can send pictures as the balloon is in the air. Again, very nice instructable, I plan to use some of your ideas. 73, Jim K5BTV.

    Real fun project for school. What lucky students to have someone like you do this. You could get a HAM Radio license and shout out real time data including landing site. Besides students would find terrific scientific and every day use of the license if they were encouraged to get their own.

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  • Neat idea to use a bucket of water and a pump instead of using water mains. This way any problem will be limited to water in the bucket. A small amount of Miracle grow ought to be a great fertilizer too. I'm gonna try it next spring

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  • Good app and will work well with DC motors. I've used this circuit for several years for another application . The graphic of PWM is a little misleading though because it does not apply to this circuit design. In this circuit, the modulation is a fixed width of one polarity as set by the potentiometer not variable during the "firing" as shown the sine wave example.

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