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  • JohnC430 commented on bartroosen's instructable New Powerful 1800W Electric Longboard2 weeks ago
    New Powerful 1800W Electric Longboard

    so what happened to you when you crashed? why didn't you elaborate? after all that was the reason for my comment. flying low at 45 kph.

    View Instructable »
  • Eco Friendly Metal Detector - Arduino

    i agree with you. i also noticed that. the diodes should be across the coils with the cathode terminal on the +Vin. and to answer one of the other commenters about 180 uh and 80 uh etc.do the math E = L*di/dt. those are very long pulses almost 4 mS.

    View Instructable »
  • JohnC430 commented on bartroosen's instructable New Powerful 1800W Electric Longboard3 weeks ago
    New Powerful 1800W Electric Longboard

    flying on your long board at 45 kph sounds awesome. if the longboard strikes a big enough bump, do u think it will launch you at 45 kph?

    12 Amps is consumed by the motor. thats what the motor requires from the battery. it is not the capability of the battery.

    View Instructable »
  • JohnC430 commented on geotek's instructable Harvesting Electronic Components3 weeks ago
    Harvesting Electronic Components

    after reading many comments, it looks like what one person said about heating the board from the back and letting the parts fall into a box sounds like a good idea. also sand in an old frying pan is the most effective and quickest way to remove parts. also quick and easy.

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  • JohnC430 commented on geotek's instructable Harvesting Electronic Components3 weeks ago
    Harvesting Electronic Components

    at first i thought. why would I? then i m bored so lets check it out.... and then i discovered...what a fantastic idea! thanks for sharing.

    View Instructable »
  • JohnC430 commented on Left-field Designs's instructable Cordless/Corded Drill3 weeks ago
    Cordless/Corded Drill

    I think I can reasonably guess the answer to this: if as I think it is, the drill has speed (torque) control and is therefore applying Pulse Width Modulated voltage (current) pulses to the motor in order to control the torque, so (within reason) the battery voltage is not the determining factor. The pulses meter out the current to what the drill requires.

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  • JohnC430 commented on BrittLiv's instructable Ozone Generator3 weeks ago
    Ozone Generator

    sounds like a good idea. better be safe than sorry.However, if u watch some YouTube videos, u will see many people making high voltage generators, much higher voltages than this corona discharge p/s and yet they don't seem to be perturbed by what they are doing.

    View Instructable »
  • JohnC430 commented on Left-field Designs's instructable Cordless/Corded Drill3 weeks ago
    Cordless/Corded Drill

    did I see it right? you replaced a 14.4V battery with a 24V/10Amp power supply.

    did I see that right? you replaced a 14,4V battery with a 24V/10 Amp power supply?

    View Instructable »
  • JohnC430 followed BrittLiv1 month ago
      • Ozone Generator
      • Qi Green Lantern Charger
      • Deadpool Knife Block
  • JohnC430 commented on BrittLiv's instructable Ozone Generator1 month ago
    Ozone Generator

    make one. (easier said than done. LOL)

    do u have a lot of other 'ibles? i am fascinated by the wide breadth of your knowledge.

    he is using the Arduino as a timer and so what? there are many ways to skin a cat and that is the easiest way for him. how do you make an automatic one hour timer?

    ok, i found the "plates" i did not notice the link. In the winter we have the heating running and in the summer its the cooling so the house is more or less sealed from the outside "fresh" air with the internal air circulating throughout the house, and diffusing thru the closets and bedding and curtains. we cook and the stink permeates every nook and cranny of the house. I open the doors and windows in the evening and thru the night to "air out" the house. I think one of these running at low power for a few minutes after we have our meals will help clear the air after the "peak stink" hours.

    View Instructable »
  • Handcrafted Wooden Ring!!! (EASY)

    yeah, and....? Here is a copy from the text: "I used a 5/8 in. Forstner Bit to do this. I started by drilling half way into the wood," so what did u say?anyway...which gives a better cut?

    yeah, tyry Brazilian Cherry or walnut. if ure in Southern California then try Georgia cherry. These trees grow all over the place. nice hard wood.very fine grain and both are very hard. they will not split etc.

    View Instructable »
  • JohnC430 commented on WoodAirGrille's instructable Ultimate Battery Management Station1 month ago
    Ultimate Battery Management Station

    ClaudioK3 yes. but u dont need to have 10 of those. USB charger is 5 volts and ur battery is 11.1V so u need to buy a down converter to make 5 volts. u can buy on ebay for $0.75. And can also buy battery charger for LiPo for a very low price with USB connector

    haha. wait until they are older. their toys will require 8 AA batteries just for the toy and a 9V or 6 AA for the controller.

    what kind of degrees do u have? Did you really major in both chemical and mechanical engineering from UC Berkeley? Really? "I've degrees" should be "I have..."

    yeah, buy a few small plastic boxes and put each type of battery in a box. then put the boxes in a cardboard carton. Screw the power strip on to the outside of the box and screw the box to the wall adjacent to the wall socket. make a small compartment for the batteries that are being charged. if u do it nicely it will not look "Tacky"

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  • Making an End Grain Cutting Board With Matching Phone / Tablet Stand

    When u have such a beautiful piece it seems a shame to start cutting on it.I have a really beautiful cutting board made of different strips of wood. cant get myself to mar the surface by using it as a cutting board.

    View Instructable »
  • JohnC430 commented on MrMarkinator's instructable Woodburning With Electricity1 month ago
    Woodburning With Electricity

    "I know that lower amperage and higher voltage makes a better picture"does not make sense

    you are absolutely correct, hence the need for anyone trying this stunt to do it outdoors on the lawn or patio (earth ground) and to stay away from the area until power has been switched off; i.e. long wires to the switch it can be reached without accessing the high voltage area.

    so what did u do? it needs 2000 Volts and not 2000 Watts. hope u did not waste money on a 2000 Watt transformer which can be any combination of voltage and current

    8KV will work. perhaps 30-60 mA may not do it, because the damp wood may overload the output and lower the voltage so u don't have 8KV anymore

    View Instructable »
  • JohnC430 commented on MrMarkinator's instructable Woodburning With Electricity1 month ago
    Woodburning With Electricity

    ok here is the training. first unplug the power. make the connections. switch on the power. when u have finished burning enough arcs. switch off the power. unplug the power. u can make more patterns by moving the clamps to another area. repeat the above procedure. make sure the switch is far enough away from the clamps. make sure the wood and clamps cannot fall over. everything needs to be properly anchored before plugging in the power and also u must have a switch.

    an arc welder will not do this. the MOT is about 2KV and the arc welder is about 35V. these patterns are because the high voltage arcs across the wood. it has been made highly conductive and the arcing is like lightning. if u try to use a low voltage it will follow the pattern of ur hand which cannot make these random trace patterns.

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  • Inexpensive Garage Lights From LED Strips

    is that a garage or a skating rink with a couple of cars?Thanks for sharing.wow! yeah, I did that with my garage also. I had bought a few thousand 3 Watt LED's from China. I had asked and paid for UV's and they sent me cool white so I could not make my grow lights. so I figured i would use them and I strung up a couple of hundred along the trusses. bought a few 10Amp 12V power supplies and voila! it is as bright as day!!! of course I only do a little woodwork or metal work in the garage so i don't need the light very often but it is fun turning the lights on and off to see how bright it becomes. which state are you located? that garage is HUGE!!!

    yes you can do that. Add a resistor in series to limit the current because the peak of the 120 Volt sine wave is 167 Volts. with a DC supply that 60 Hz is missing. even with full wave rectification you will still feel the 120 Hz. you will still need the limiting resistor. resistor value will be dependent of the current thru the diodes (LED's).

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  • Rusty Junk to Useful Stuff EASY With Chemistry!

    cool idea. thanks

    and you breathe the rusty dust... rust dust!!!

    Wikipedia:"Lye" is commonly an alternative name of sodium hydroxide (NaOH) or historically potassium hydroxide (KOH), though the term "lye" refers to any member of a broad range of metal hydroxides." Highly alkaline substance

    I have seen YouTube videos that people used Vinegar to remove rust. No electrolysis. very clean and as you said, rusts very quickly after the part is removed from the vinegar. Need to apply a thin coat of oil to protect it.

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  • JohnC430 commented on Marc Gyver's instructable Duct Tape Canoe1 month ago
    Duct Tape Canoe

    cool idea. really nice job.

    and the average american throws away more than 1 ton of waste material

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  • JohnC430 commented on Radical Geezer's instructable Build the Best Tomato Cages Ever!2 months ago
    Build the Best Tomato Cages Ever!

    I like this idea. easier to build. just roll it and tie the ends. thanks.

    where do you live for the plants to grow so well?I live just north of Los Angeles. very peasant winters but hot and dry in the summer months. i have tried growing tomatoes but i get nothing. in all the years i got one tomato about an inch in diameter. absurd but true. i don't know what i am doing wrong, and i have seen people with those huge plants

    View Instructable »
  • JohnC430 commented on danielrp's instructable Superb Lab Power Supply2 months ago
    Superb Lab Power Supply

    This is a very good 'ible. really goes into the nitty gritty of the power supply.thanks for sharing.

    this is a linear supply. what kind of noise are u thinking of? from what source?

    even though I may also enter the contest, you did such a good job of the 'ible that I voted for you. Good luck. You seem to know power supplies very well, so why did you not go for a switcher?

    yeah. the company is in China. i just priced my pcb with them and they wanted $5 for 10 boards and 21 for shipping. it still beats the price of 3 for $75 including $14 for shipping in USA. local USA pcb houses cannot compete with that.

    View Instructable »
  • JohnC430 commented on Stish's instructable DIY Power Supply for 5V and 3.3V3 months ago
    DIY Power Supply for 5V and 3.3V

    With 7 VDC max input, the 3.3 V regulator will have about 3 watts at 1 Amp. Generally the TO-220 package is only good for 2 W to 2.5 W. if you limit the output current to about 0.6 Amps then you don't need any heat sinks. I suppose lost loads are lower than that.

    View Instructable »
  • JohnC430 commented on abhishek123's instructable Multichannel Wireless Light Dimmer3 months ago
    Multichannel Wireless Light Dimmer

    Hi abhishek123, this looks like a great project. The new schematics answer a lot of questions, however, I am still not clear what is AC1 and AC2. Are these the two wires coming out of the AC in the wall? if so then are they ACLine and Neutral? if not then what are they? (I don't know how the wiring is for 230 VAC)sorry to bother you about this as I am trying to understand so that I can imitate what you did. (Imitation is the greatest form of flattery :). ).

    Thanks. After viewing the video i understand that AC1 and AC2 are the two mains wires coming from the wall plug.

    View Instructable »
  • JohnC430 commented on mikeandlauren's instructable DIY Powder Coated Yeti Cups3 months ago
    DIY Powder Coated Yeti Cups

    sorry i made an error above so i am correcting it with a quote from 'Journal of Electrical Engineering'"Normally air medium is widely use as aninsulating medium in different electrical power equipment asits breakdown strength is 30 kV/cm"

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  • Simple Low Resistance Tester (Milliohmmeter)

    Thanks for sharing. this is an excellent idea and it is accurate enough for my needs

    if i need to increase accuracy i can add an x10 or even a 100x op-amp powered from the 5V.there are many ways to skin a cat and this approach is very simple. and obviously one does not need two DVM's. take one reading and then the other. If as one of the readers was talking about measuring closed relay contact resistance in that case one needs to measure in the micro ohms range. i want to measure the resistance between two Nickle strips for spot welding. i was making assumptions about their contact resistance and did not know what is needed to design my battery terminal spot welder.

    another point of observation. when making very low ohm measurements where a high current is passed thru the low value resistor a Kelvin connection is necessary i.e. two wires at each terminal; one pair for the high current and the other for the voltage measurement at the point of contact, so this now becomes a more elaborate instrument and is not simple anymore. again thanks for sharing this idea.

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  • JohnC430 followed hanlin_y3 months ago
      • ATTiny84 Based 3A Step-Down LED Driver
      • 12V SLA Powered 15W LED Lamp
      • 78.125 KHz ATtiny85 Based Boost LED Driver
  • JohnC430 commented on mikeandlauren's instructable DIY Powder Coated Yeti Cups3 months ago
    DIY Powder Coated Yeti Cups

    I did a search and found that if epoxy is used instead of just paint particles it has a dielectric strength of 1200V/mil using a 10 mil coating. so a 3-5 mil coating would be safe for about 500 Volts. it works up to 150C which is also plenty.

    i just used 120V as an example.i designed a transformer with 30 turns on the primary at 240V which is 8 V/Turn. the wires were made of copper strip. the secondary was for 200 amps also copper strip. i needed to isolate the windings from each other and tried a few layers of paint which did not work. eventually i used mylar tape and it worked. That crazy project of mine was eventually installed in an electric vehicle built for the Marines. I did not know about powder coating when I did it in 1995. it went into production and by now i dont know how many hundreds of this crazy idea were made. so u dont have to worry about anything. None of them ever failed.

    by the way, thanks for the link. it says that epoxy powder coating is a great:A typical high potential electrical test can be performed if requested, scanning all surfaces at twice the operating voltage plus 1kV. so i suppose this answers my question.

    View Instructable »
  • Scrap Wood End Grain End Table | How to Build

    yeah, thats what i thought.... very heavy.

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  • Scrap Wood End Grain End Table | How to Build

    Cool looking table. Thanks for sharing.how much does it weigh?

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  • JohnC430 commented on mikeandlauren's instructable DIY Powder Coated Yeti Cups3 months ago
    DIY Powder Coated Yeti Cups

    Great idea! thanks for sharing. how hard is the coating? does it scratch easily? is the coating electrically insulating i.e. can it withstand 120VAC? If so I have a use for it.

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  • JohnC430 followed bearkat_wood3 months ago
      • Walnut Cafe Chair
  • JohnC430 commented on Rob Cai's instructable Simple Grafting Without Special Tools4 months ago
    Simple Grafting Without Special Tools

    Thanks for sharing.

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  • JohnC430 commented on replayreb's instructable Music Laser Light Show4 months ago
    Music Laser Light Show

    very nice and innovative.

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  • JohnC430 commented on gravityisweak's instructable Coat Hanger Drill Bit4 months ago
    Coat Hanger Drill Bit

    how did you thread the two wires thru the hole? that's another feat!

    View Instructable »
  • Extend Defective Fluorescent Tube-Light Life

    cool idea and also funny that the cap blew up after a few weeks. what was the voltage across the cap?

    how did you deduce all this?

    View Instructable »
  • Extend Defective Fluorescent Tube-Light Life

    I am an power electronics engineer and have observed that actually this new generation can do a whole lot of things better, more accurately and more efficiently that we ever did. Fortunately for me I "keep up with the times" so I am not out of the loop.

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  • Extend Defective Fluorescent Tube-Light Life

    Mind you i have not done these experiments so i am just guessing at the values i am mentioning. I am confused. Why 8 watts? what is the voltage across the heater pins on the good side? at 8 watts you can apply V^2 = 200x8 = 1600; so V=40 Volts across the filament. i would think the actual applied filament voltage from the electronic ballast is no more than 4-6 Volts so a much lower wattage resistor could be used. and also is the resonant inductor really 1.3mH? with 60KHz operation i would think it is very much lower. how much is the old type inductive ballast?

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  • JohnC430 commented on mrstan's instructable Repair Dead COB LED Light Bulbs4 months ago
    Repair Dead COB LED Light Bulbs

    dont waste your money, time or energy on that. it is dead! you should first check it out and see if there is anything worth salvaging apart from the mechanical structure. after all the way u described it, was it went off like a sparkler on the 4th of July. so many little parts to replace. and I am sure since it was made for 12 VDC, there is no rectifier. so any parts in the 120 VAC stream would be fried. dont keep it. throw it away. it will take hours of ur time to replace the parts. from the pictures it looks like 60 LED's or maybe more.

    im not familiar with the term. what does AFAIK mean? thanks

    LOL! u really made me laugh. yeah that too. i was commenting about what he learnt in military school and ure commenting about the lesson he learnt from his mistake. good and very true! thanks for the laugh for the day :))

    View Instructable »
  • JohnC430 commented on mrstan's instructable Repair Dead COB LED Light Bulbs4 months ago
    Repair Dead COB LED Light Bulbs

    yep! that is priced at $20. too bad and also you are correct, even though they say it is a 12V bulb they should not be selling it with an Edison base. where on earth do they use that kind of base for 12V?

    No Larry, you learned that u cannot put a 12V bulb into a 120V socket.

    or even a diode in the right direction. but anyway, one jumper instead of an LED will not affect anything. there are probably 50 to 100 LED and jumpering one is not a significant change in current.

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  • JohnC430 commented on wordsnwood's instructable Barbecue Platter4 months ago
    Barbecue Platter

    Great work. thanks for sharingas seamster said. i got a cutting board like this as a present and just kept it as a decoration.

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  • JohnC430 commented on danthemakerman's instructable Letter Opener Made From Junk Mail5 months ago
    Letter Opener Made From Junk Mail

    if a prisoner wants a weapon he will make one. you are not the first to think of that! they will come up with the craziest things. TV and movies also give them ideas.

    Thanks for sharing!

    Great idea! It gave me an idea. I had a letter opener and i mis placed it. i have some Brazilian Walnut which is a very hard wood and i have used some of it to make various things. A letter opener would be a great use for some of it.

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  • JohnC430 commented on GregO29's instructable Solar George Foreman Cooker5 months ago
    Solar George Foreman Cooker

    could you use CD's instead of HDD? where are you getting all the old hard drives from?

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  • JohnC430 commented on RobinJ66's instructable How to Re-Engineer Paper Back Into Wood5 months ago
    How to Re-Engineer Paper Back Into Wood

    First off... $400 to replace a piece of 2'x3' is a complete rip-off. you can cut out the defective parts with a saw and replace it with fresh waterproof plywood. just place the 4x8 plywood sheet (from your local lumber yard) on the floor and cut around it. Rip out of dig out the old defective layer and place the new sheet in its place then do the next one. the waterproof plywood may not be cheap but will certainly cost less than $400.for the whole area

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  • JohnC430 commented on SparkItUp's instructable Slow Dance - A Fusion of Art and Magic6 months ago
    Slow Dance - A Fusion of Art and Magic

    you are missing the duty cycle. short pulses and long off time. so average power is much lower

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  • How to build an insanely bright LED flashlight!

    oh yeah, I just read what he wrote about "dont short the output of the boost converter" another thing my modification will allow you to do is to short the output without blowing up the converter.... LOL.

    Wow! Canadian prices are crazy! I bought a few of that same Boost converter for $3 each. bought a few to make a 8Amp battery chargers by modifying the boost inductor to make it into a regular "Flyback". it meant I had to change stuff... add one more wire to the winding and add some snubbers because I used extra diodes etc. the control circuitry is the same.

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