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  • tomjasz commented on Steve Willson Kujur's instructable Build a Power Bank in $21 year ago
    Build a Power Bank in $2

    ridiculous, it's slow down the process. IF you MUST solder solerto th edge of the negative end, and use solder braid techniques. LOTS of fires have been reported when poor techniques are used. Not one single maker of battery packs in the world solders packs. But suddenly we're experts and are certain soldering is not a problem. Right.

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  • tomjasz commented on Steve Willson Kujur's instructable Build a Power Bank in $21 year ago
    Build a Power Bank in $2

    sometimes you have to look beyond the first link you see. The primary parts is $2.00 on Aliexpress.

    Solder wick can be the fastest way to attach power leads. Lithium batteries HATE heat!

    Soldring is NOT a good idea. Better to use a kit like VRUZEND to hold batteries. OR invest $100 in a Arduino nickel strip welder. If you must solder be QUICK. Damaging a cell can mean another fire.

    I buy regularly from Aliexpress and Banggood. Both are slow, but buyer beware, many China sellers are now on Amazon and are just as slow. Pay attention to the listings and shipping time. Often you can pay an additional small fees for shipping on Banggood and get somewhat faster service. ALWAYS look over the boards carefully for cold solder joints and any other problems. These batteries are capable of high averages. 10A output is sufficient to produce tremendous heat and fire.

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  • tomjasz commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder1 year ago
    DIY Arduino Battery Spot Welder

    nice! Fast and very reasonable shipping too. Very very well done! Thank you. Now, a welding pen somone?

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  • tomjasz made the instructable DIY Arduino Battery Spot Welder1 year ago
    DIY Arduino Battery Spot Welder

    now please someone more creative than i replicate a two probe pen. $50 is to much... ideas?

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  • tomjasz commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder1 year ago
    DIY Arduino Battery Spot Welder

    I'm sorry, the diode cable is the schottky, should be 7-8AWG?

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  • tomjasz commented on 陳亮's instructable Scan Photo With Your Mobile Phone1 year ago
    Scan Photo With Your Mobile Phone

    https://www.amazon.com/Lemonbest-Flexible-3528smd-120leds-Waterproof/dp/B015R87GQK/ref=sr_1_3?ie=UTF8&qid=1482869828&sr=8-3&keywords=5v+led+strip+white2M already wired with USB $8

    OK one more, $2.10 delivered.https://www.aliexpress.com/item/5V-50CM-1M-2M-3M-4M-5M-USB-Cable-Power-LED-strip-light-lamp-SMD-3528/32700753061.html?spm=2114.01010208.3.11.9mIAh4&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_10000009_10084_10083_10080_10082_10081_10060_10061_10062_10056_10055_10054_10059_9912_10099_10078_10079_427_426_10103_10073_10102_10096_10052_10050_10107_10051_10106-9912,searchweb201603_3,afswitch_1&btsid=35b9c833-9dc6-4ba9-88a4-1c78df952f34

    Anyone sort out the measurements? Old guy here struggling with what size panels to buy.

    I'm in under $10. $2.10 for a 1M USB light. Amazon has the sheets for around $6.00. Local stationary store for even less.

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  • tomjasz commented on hanlin_y's instructable Car Horns for Bicycles2 years ago
    Car Horns for Bicycles

    Whats all the junk and scraps of paper? Camouflage?

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