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  • jimdkc commented on abzza's instructable Ultimate DIY Breadboard Power Supply2 months ago
    Ultimate DIY Breadboard Power Supply

    Nice job!I'm mulling over a dual-regulator version so I can have different voltages on the 2 busses...

    Also, if you choose 300 ohms as your R2 value, R1 can be hit exactly using standard 1% resistor values for all desired voltages:Voltage - R1 = R1a + R1b1.5v - 60 = 30 + 303v - 420 = 220 + 2003.3v - 492 = 430 + 625v - 900 = 470 + 4306v - 1140 = 750 + 3909v - 1860 = 1.5K + 360

    Also, if you choose 300 ohms as your R1 value, R2 can be hit exactly using standard 1% resistor values for all desired voltages:Voltage - R2 = R2a + R2b1.5v - 60 = 30 + 303v - 420 = 220 + 2003.3v - 492 = 430 + 625v - 900 = 470 + 4306v - 1140 = 750 + 3909v - 1860 = 1.5K + 360

    Those are actually all standard 2-5% resistor values, but they are all readily available in 1% resistors, too. I had all of these values in a resistor kit purchased on eBay.Search for "1/4w 1% resistor assortment"I bought one of the 3120 piece assortments (20 each of 156 values) for under $15 shipped.

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  • jimdkc commented on Radical Geezer's instructable Build the Best Tomato Cages Ever!2 months ago
    Build the Best Tomato Cages Ever!

    I had a bird problem, too. I solved it by tying long strips of reflective mylar (previously I used strips cut from an old insulated shopping bag, this year I purchased mylar "space blankets" on eBay) to the tops of each cage. They move with the slightest breeze and reflect the sunlight. The birds steer clear!

    Yep. A set of 14" bolt cutters will run about $15 at your local big-box hardware store.

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  • jimdkc commented on Radical Geezer's instructable Build the Best Tomato Cages Ever!3 months ago
    Build the Best Tomato Cages Ever!

    I live just east of Kansas City, Missouri. I have lived in Southern California, too, and the best tomatoes we ever grew there was with the aid of chicken manure, applied a few weeks before planting. This year, put a handful of worm castings and a little epsom salts in each hole where I planted my tomatoes. All my plants (except 1!) look really good this year, so far.

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  • jimdkc commented on Radical Geezer's instructable Build the Best Tomato Cages Ever!3 months ago
    Build the Best Tomato Cages Ever!

    Those are some nice cages! I got tired of flimsy commercial tomato cages a few years ago and bought a 150 foot roll of 6x6x10x10 concrete reinforcing remesh. (6x6x10x10 = 6 inch x 6 inch opening, 10 squares or 5 feet high, and 10 gauge wire). I cut off 6 foot lengths and zip-tied the edges together to make cylinders (roughly 2 feet in diameter). They are NOT rustproof... but it will take YEARS for them to rust through! I staked them to the ground this year with 3 foot lengths of rebar driven 2 feet into the soil, 3 per cage (previous years I used 2 foot wooden stakes driven 1 foot deep... but I did have 1 cage fall over!) And I still have most of the roll of remesh in my garage! I've also made 2.5 foot extensions to attach to the top of the cage when the plants get really tall. One of ...

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    Those are some nice cages! I got tired of flimsy commercial tomato cages a few years ago and bought a 150 foot roll of 6x6x10x10 concrete reinforcing remesh. (6x6x10x10 = 6 inch x 6 inch opening, 10 squares or 5 feet high, and 10 gauge wire). I cut off 6 foot lengths and zip-tied the edges together to make cylinders (roughly 2 feet in diameter). They are NOT rustproof... but it will take YEARS for them to rust through! I staked them to the ground this year with 3 foot lengths of rebar driven 2 feet into the soil, 3 per cage (previous years I used 2 foot wooden stakes driven 1 foot deep... but I did have 1 cage fall over!) And I still have most of the roll of remesh in my garage! I've also made 2.5 foot extensions to attach to the top of the cage when the plants get really tall. One of my plants last year grew to over 9 feet tall in its 7.5 foot cage!

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  • jimdkc commented on mecanicafina's instructable Safe Capacitor Discharge Tool5 months ago
    Safe Capacitor Discharge Tool

    Agree. I would encapsulate all the exposed wiring in a blob of silicone sealant.

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  • jimdkc commented on randofo's instructable DIY Guitar Pedal7 months ago
    DIY Guitar Pedal

    I like those dial plates! It's worth noting, if you want to build other projects to match this, that they are less expensive the more you buyYou get 2 for $4.34 ($2.17 each, the link you provided)Or... you can get 5 for $6.44 ($1.29 each) https://www.amazon.com/dp/B0147XRJ0OOr... you can get 10 for $8.41 (84¢ each) https://www.amazon.com/dp/B0147XDQQA

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  • jimdkc commented on pandyaketan's instructable LED on AC Mains9 months ago
    LED on AC Mains

    You do need the diode because an LED can only tolerate about 5-6 volts of reverse voltage.

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  • jimdkc commented on Nikus's instructable 555 Useless Machine10 months ago
    555 Useless Machine

    No. You need to either use a DC gear motor or remove the servo control board and wire directly to the motor. Also, the servo should be a continuous rotation type.

    Yes! Absolutely! The 555 is a great chip to have in your arsenal! No better way to learn it than to actually use it!

    Yes, an Arduino is overkill for this project. But, so is a 555 timer.

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  • Make a woodshop pre-filter (aka cyclone) for $8

    If you have a Firehouse Subs near you, they sell their bright red 5-gallon pickle buckets for $2 each. Proceeds go to provide life-saving equipment and resources for firefighters, police, and EMTs. The buckets do smell like pickles, but that shouldn't matter for this use! Good sandwiches, too!

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  • jimdkc commented on amandaggogo's instructable Zipper Face Tutorial Redux1 year ago
    Zipper Face Tutorial Redux

    A Zipperface is always a fun costume to do!

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  • jimdkc commented on MakeStuff_MS's instructable DIY mini Amplifier using TDA28221 year ago
    DIY mini Amplifier using TDA2822

    OK... I see from the datasheet of a TDA2822 that this is a correct bridge configuration. Normally for a bridged amp, you have to drive both inputs. Apparently this amp chip takes care of that internally.

    Well... it could be a bridged amplifier... except the input of one of the amps is grounded, so only 1 amp in the chip is active! To make it a bridged amp, you'd have to unground pin 6 and feed an inverted copy of the input signal to pin 6.The way this amp is designed, half of the amp chip is wasted.

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