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  • JohnC430 followed bearkat_wood3 days ago
      • Walnut Cafe Chair
  • JohnC430 commented on Rob Cai's instructable Simple Grafting Without Special Tools1 week ago
    Simple Grafting Without Special Tools

    Thanks for sharing.

    View Instructable »
  • JohnC430 commented on replayreb's instructable Music Laser Light Show1 week ago
    Music Laser Light Show

    very nice and innovative.

    View Instructable »
  • JohnC430 commented on gravityisweak's instructable Coat Hanger Drill Bit2 weeks 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.

    View Instructable »
  • 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?

    View Instructable »
  • JohnC430 commented on mrstan's instructable Repair Dead COB LED Light Bulbs2 weeks 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 :))

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  • JohnC430 commented on mrstan's instructable Repair Dead COB LED Light Bulbs2 weeks 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 Platter3 weeks 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 Mail1 month 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 Cooker1 month ago
    Solar George Foreman Cooker

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

    View Instructable »
  • JohnC430 commented on RobinJ66's instructable How to Re-Engineer Paper Back Into Wood1 month 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 Magic2 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

    View Instructable »
  • 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.

    I actually checked for the legal maximum brightness of car headlights. neither in Canada nor in California are there any limits. looks like 55 Watts is the biggest manufactured lights on the road but I am sure there are those who make their own and use them. especially when off-roading, marine or RV types.

    yeah the schematic is a mess but if u can spot the errors then u should also be able to fix them for yourself. no biggie !!!

    infrared is not visible light. what will you do with it? there are infrared LED's but they are not "high brightness" because most of the high brightness are made in either red or green or white. if u can get the high brightness infrared LED's then just use them like this guy has made his white LED's.

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  • JohnC430 commented on JustAddSharks's instructable DIY Heng Lamp2 months ago
    DIY Heng Lamp

    maybe you showed it to one of your friends or someone saw your drawing. they stole your design. too bad. some of my own designs were stolen and patented by co-workers of mine. but that's life.

    very cool design. elegant and pretty.

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  • JohnC430 commented on gravityisweak's instructable Coat Hanger Drill Bit2 months ago
    Coat Hanger Drill Bit

    COOOOLLLLL IDEA. thanks for sharing.

    I made a drill bit from a 3/8" foot longthreaded rod I had bought from Home Depot. Just hammer the end of the rodflat and then file it to shape like a wood drill bit and make sure your sharpedges are facing the right direction. Works great. You can usealmost any diameter as long as you can hammer the tip flat and shape it. HD also carries 3 foot long rods of various diameters.I don’t know enough about heat hardening so if itis possible maybe the tip can also be hardened so it does not wear out too soon.

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  • JohnC430 commented on MrFixItDIY's instructable DIY Cheese Slicer Board2 months ago
    DIY Cheese Slicer Board

    is that for a parts kit or is it for the plans? $5.76 is pretty good for avoiding all the hard work.

    Not really a good option. you are handling the cheese all over and that's quite unhygienic Plus what he has done looks very nice and adds flair when you have guests.

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  • JohnC430 commented on eLVirus88's instructable Reclaimed Corner Desk2 months ago
    Reclaimed Corner Desk

    Looks SOLID. I'm sure it will not come down in an earthquake (I live in California). Looks like you had a lot of wood and wanted to use all of it. Were you practicing so you can work on Trumps plan to repair the Nations Infrastructure, like Bridges, etc.? I have a nice large corner in my "office" and I think that is a good way to go. I was planning on doing that when I moved into the house but got sidetracked by "other stuff". Thanks for sharing.

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  • JohnC430 commented on SpecificLove's instructable Survival Whistle from a Soup Can3 months ago
    Survival Whistle from a Soup Can

    thanks for sharing. great idea!! we old folks have forgotten what we knew when we were kids. made whistles with leaves and tin can tops too. thanks for reminding me of my younger days. everything was fun.

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  • JohnC430 commented on JackmanWorks's instructable 294 Piece Segmented Pepper Grinders3 months ago
    294 Piece Segmented Pepper Grinders

    thanks for sharing. that was a huge amount of work. is there a storage hole in the center for the pepper corns or do u put them into the metal top part when ure ready to grind?

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  • JohnC430 commented on jim_chung's instructable Jim's Rising Chair 3 months ago
    Jim's Rising Chair

    wow! really great project although it is very expensive in terms of cost of materials. I suppose it may be possible to make it in wood for a little lower cost. but thanks for sharing this wonderful idea.

    It is a beautiful chair but is it comfortable to sit on for any prolonged time? I would think that with the 1" spaces between the slats it would feel uncomfortable after a while.

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  • JohnC430 commented on SimonH145's instructable Bodyweight Fitness / Calisthenics Gym3 months ago
    Bodyweight Fitness / Calisthenics Gym

    if I was building that now, I think I would stop at step 6. any further would mean a life time of hard work

    wow that's a cool exercise machine. Did your wife get a surprise when she tried to walk in the bedroom door and found it was blocked by the machine :)) I guess it is the closet door. there are 3 men in the pictures. which one is you? the one with the bald patch or the guy doing the pull-ups? I made one at work once and everyone got a chance to use it. it was not as Impressive as this one. we did pull ups and standing push ups (I don't know what they call it, like the guy lifting himself on the bars) thanks for sharing.

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  • JohnC430 commented on PaleoDan's instructable Hi-Contrast Gaming Table3 months ago
    Hi-Contrast Gaming Table

    wonderful job. the idea of burning the wood sounds great. awesome gift thanks for sharing.

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  • JohnC430 commented on PaleoDan's instructable Low Income Hydroponics System: Lettuce3 months ago
    Low Income Hydroponics System: Lettuce

    very nice, but u show it lighted with an LED lamp which costs $28 plus shipping. windows do not have sunlight for more than a couple of hours a day so one needs the lamp to get any kind of growth indoors. this looks like click bait to me. why do people do this game? I don't know how the Instructables works. do u get something for every click that u get?

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  • How To Make A Bright LED Panel For 20$

    I am familiar with the voltage regulator he used in this ible. it puts out DC with a lot of filtering so it is not pulsing (Look at the first pic and u will see the filter cap mounted near the transistor or go to ebay and see close up pics of it) . also he is using a pot to adjust the light to whatever brightness he needs so there is nothing wrong with this.apart from that at 180KHz neither ur eyes nor your camera will see the blinking.LED's require current control for brightness adjustment but since the strip already has a resistor for each set of 3 series LED's they form a crude current source which is again ok for this to work.The fact that he has made it so cheap, and is sharing the idea with us is very generous of him. no matter if it is a competition or not.The power supply AC ...see more »I am familiar with the voltage regulator he used in this ible. it puts out DC with a lot of filtering so it is not pulsing (Look at the first pic and u will see the filter cap mounted near the transistor or go to ebay and see close up pics of it) . also he is using a pot to adjust the light to whatever brightness he needs so there is nothing wrong with this.apart from that at 180KHz neither ur eyes nor your camera will see the blinking.LED's require current control for brightness adjustment but since the strip already has a resistor for each set of 3 series LED's they form a crude current source which is again ok for this to work.The fact that he has made it so cheap, and is sharing the idea with us is very generous of him. no matter if it is a competition or not.The power supply AC to 12VDC to power the buck regulators can be bought for about $6 each from dx.com or ebayThanks for sharing.

    yes I also saw the flicker on the wall. it may be from this LED light. perhaps his power supply is doing it because the flicker is at a very low frequency (after all we can see it). it may be his DC-DC or even his AC-DC power supply is unable to handle the load so it is oscillating

    View Instructable »
  • JohnC430 commented on MicahS23's instructable Wood Beam Fireplace Mantel4 months ago
    Wood Beam Fireplace Mantel

    I looked at the first picture and thought: Wow, it is a solid heavy piece of lumber, and then the first words I read in the comments were:"Please be careful when installing a wooden mantle." my first thought was if that thing fell on your foot then waaaaaaaaaaaaaa!!!!!!!!!!then I started reading the instructible and it is hollow. fooled me. very good job..

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  • JohnC430 commented on smooth_jamie's instructable AC Current monitoring data logger4 months ago
    AC Current monitoring data logger

    Ok I missed it. in the text you mentioned a 220 Ohm load resistor for the CT making the amp gain no more than x4.5. or max current of 0.303 Amps with your values. how does this work? what were you intending to measure with this instrument? very small currents. perhaps I am missing something? I thought also that the Arduino ADC input is limited to 5 Volts but I may be wrong, cos I don't know anything about it.

    ac couple 50 Hz?

    ahhhh...:) thanks. 100 mA explains it. I usually think in terms of 20 to 1000 Amps and forgot that there is another world out there. I was thinking of 10 Amps in the CT and got wayyyy out of the ball park.

    nice project. thanks for sharing also all the calcs and files.Its a lot of work but a good project.the following is just suggestions and not intended to find fault with what you did:why did you use a gain of 150? seems very high. the current transformer spec sheet shows the linear range to be 10 Amps and a suggested load resistor of 50 Ohms. Most home appliances will use that full range. what was the load resistor you used for the CT?Since ur amplifier uses +/- 12 Volts as the DC Buss its output linear range is restricted to approximately 10 Volts. if you used the 50 Ohms resistor then your amp gain has to be no more than 1000/50 = 20. a lower value resistor allows u to use a larger amp gain but that reduces the accuracy of the CT because the wire resistance of the CT becomes a majo...see more »nice project. thanks for sharing also all the calcs and files.Its a lot of work but a good project.the following is just suggestions and not intended to find fault with what you did:why did you use a gain of 150? seems very high. the current transformer spec sheet shows the linear range to be 10 Amps and a suggested load resistor of 50 Ohms. Most home appliances will use that full range. what was the load resistor you used for the CT?Since ur amplifier uses +/- 12 Volts as the DC Buss its output linear range is restricted to approximately 10 Volts. if you used the 50 Ohms resistor then your amp gain has to be no more than 1000/50 = 20. a lower value resistor allows u to use a larger amp gain but that reduces the accuracy of the CT because the wire resistance of the CT becomes a major factor.So what resistor did you use?Also instead of a half wave rectification if you used full wave rectification it could help with accuracy and calibration and since you are measuring 50Hz then filtering for 50 Hz on the output would also help. also I don't see a bleeder resistor across the output cap so it becomes a peak detector. perhaps the Arduino input may load it down somewhat. no matter what I have said, I think this is a pretty good project

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  • JohnC430 commented on manuelmasc's instructable DIY Center Finder Tool4 months ago
    DIY Center Finder Tool

    Great idea. Not new but a good reminder on KISS. thanks for sharing

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  • JohnC430 commented on DIY Circuits's instructable Transformerless Adjustable Joule Thief4 months ago
    Transformerless Adjustable Joule Thief

    fantastic but can u build it with those tiny components? not really practical at 0201. perhaps for machine placed projects.

    what is the voltage of fuel cells?

    i made one of these with germanium transistors 50 years ago using a very low voltage. also made one with Silicon.. NPN+PNP. it had a very long time constant. it was about 15 to 20 minutes before we heard a click. the inductor needs to saturate in this design same as the regular "joule thief" it is really just a simple relaxation oscillator

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  • Basic Wood Veneering Techniques Made Easy!

    where did u buy the veneer? I have an antique table with a veneer top that has been damaged and i want to give it a new face.

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  • JohnC430 commented on darthwolf's instructable A Simple Bench Variable Power Supply4 months ago
    A Simple Bench Variable Power Supply

    are the two +12V outputs separately regulated? are they separately regulated from the +5V? somehow i had the impression that there is only one output that is regulated (possibly the high current +5V output)and the rest are just followers except for the 3.3V output. can anyone please comment on my question? i understand power supplies but am not familiar with those in the pc's. also i thought they were all designed as flyback configuration. if so then should one not have at least a minimum load on one output?

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  • Arduino-controlled True Switching Regulators

    sticking a 1Meg Ohm resistor at the comp pin and adding a note that using a different value may be ok.... no it is not ok! you already knew that it did not work but u went ahead and published it. why did u do this? for the contest?

    read above

    MartinD; I'm sorry for being so harsh in my comment. I thought u were just posting to win the contest. Now as for Loop Comp... No u do not have any and perhaps u should read a little about what it is and what it means. then you will know that I am saying is the truth and not trying to be mean to you. it is much too involved to explain online like this. if it was simple I would try. and it has nothing to do with the TL494. it has to do with the fact that u have an LC filter at the output and u are feeding back to the controller (TL494 or any other). an LC filter is a 2 pole filter and one pole needs to be cancelled and you don't have it anywhere in ur schematic. the op-amps, etc. that u mention do not make compensation. what u have there are merely sensors and they only close ...see more »MartinD; I'm sorry for being so harsh in my comment. I thought u were just posting to win the contest. Now as for Loop Comp... No u do not have any and perhaps u should read a little about what it is and what it means. then you will know that I am saying is the truth and not trying to be mean to you. it is much too involved to explain online like this. if it was simple I would try. and it has nothing to do with the TL494. it has to do with the fact that u have an LC filter at the output and u are feeding back to the controller (TL494 or any other). an LC filter is a 2 pole filter and one pole needs to be cancelled and you don't have it anywhere in ur schematic. the op-amps, etc. that u mention do not make compensation. what u have there are merely sensors and they only close the feedback loop without the Loop Comp.The schematic in the datasheet is incomplete in that they do not show the Loop Comp components. they only mention it when they are suggesting a layout. it was written in 1983 and at that time loop comp was not very well understood by a lot of engineers so it was omitted from the schematic in the datasheet. if u look at some modern day datasheets or app notes you should see the components and design notes of how to do it.

    it is a power supply. you supply the input power and it supplies regulated voltage at a different voltage based upon the command that you give it, even if your input power supply voltage changes. he has shown three different outputs relative to the input voltage. one gives a higher output another makes a lower voltage and the third gives a negative voltage. The schematic does not show where the input commands come from. Also he does not show the Arduino code. it looks like a good design but i have not analyzed the closed loop control so who knows?

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  • JohnC430 commented on zposner's instructable The Digital Doormat4 months ago
    The Digital Doormat

    Now all u need to add is a high voltage source and zap the intruder

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  • Reclaimed Oak Trestle Table

    WOW!!! again WOW!!!! very nice

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  • JohnC430 commented on m8pilon's instructable Wood lamp 5 months ago
    Wood lamp

    Very nice. Congratulations.

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  • JohnC430 commented on kasra_sa's instructable Brush-less motors for your drone5 months ago
    Brush-less motors for your drone

    kasra_sa. thanks for sharing such a good instructible. very good info. Thin wires are only needed because it is difficult to bend thick wires when winding. Electrically it is only needed when running at 20KHz or greater and BLDC only runs below 5KHz.

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  • JohnC430 commented on ShakeTheFuture's instructable Make a Melting Spoon5 months ago
    Make a Melting Spoon

    cooool !!!!!! thanks for sharing

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  • JohnC430 commented on makjosher's instructable Rocket Boat5 months ago
    Rocket Boat

    is there a way to make slower burning fuel?

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  • JohnC430 commented on souhadl's instructable Motion Detection Lights 5 months ago
    Motion Detection Lights

    i was obviously just kidding about going back to school.

    he means that if there is a short from 230V to the pir sensor. the power supply is a commercial product with Isolation and beyond that there is only low voltage so I don't see how that can happen.

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  • JohnC430 commented on souhadl's instructable Motion Detection Lights 6 months ago
    Motion Detection Lights

    oh by the way now taking JodyF's "advice". I think it is time for you to go back to college and get your engineering degree. I am an electrical engineer and also am a certified electrician and have designed and built dozens of high power and high voltage electrical and power electronics projects. I understand what he is talking about. he is right about safety, however since the project is already in a safe place and out of reach, there is no need to off the deep end.

    check ebay and understand what a PIR detector is. too bad about your nightmares

    for the next one use a 220ac/12VDC regulated power supply and add the 5V regulator. LM7805. you do not need much power for this project and everything will be safe.

    Don't pay attention to the negative comments from JodyF. you did a great job of this and installed it where hands do not normally go. so "stray wires" etc is nonsense. it has already been installed.

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  • Designing a Dual 40A PWM Speed Controller for Brushed Motors

    Thanks. The output waveform of "Modified sine wave" inverters is like that and I wondered how you did it. I know it must be easy but I'm still trying to figure out how to do it.Have you tested it yet on the motors using batteries?

    Hi nqtronix. you mentioned a "push-pull" what is that? I am not familiar with that. please explain/describe it. Thanks.

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  • Designing a Dual 40A PWM Speed Controller for Brushed Motors

    I'm glad you finished. Congratulations!! I need an explanation about Step 22. the scope waveform shows a positive going waveform "Full ON" and then at 50% on a series of pulses in the positive and then another series going negative. what were your measuring points? where did you attach the scope ground?

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  • JohnC430 commented on pascal_stv's instructable Upgrade Led Flashlight for fun6 months ago
    Upgrade Led Flashlight for fun

    don't worry about your English. Half the English or Americans don't speak better than you. in this article it is your technical knowledge that is important which is not lacking.

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  • JohnC430 commented on smart_coaster's instructable DIY Smart coaster6 months ago
    DIY Smart coaster

    WOW! over $100 for a coaster? Hmmmmm... Classy restaurants will not use these. the mid level ones will balk at the price. destroying a $25 scale to pull out the load cell... only done by college students who have no concept of economics. Not even a proper schematic and the only drawing of the Wheatstone bridge was an almost illegible scribble on a piece of paper. why such a bad presentation? is this what comes out of KTH Royal Inst of Tech? sorry for the bad critique. the product is innovative and interesting but is it practical? its ok to have it in ones home or give one as a gift. It would probably be a product to sell at "The Sharper Image"

    Glasses come in all sizes and shapes and weights. the restaurant will need to calibrate each type of glass they use and build a Table. then we come to a situation that two glasses will be the same weight when empty but will differ considerably when partially full. then what happens? This is not a "product" for mass use. it is ok for individual use. This has not been fully thought thru. sorry for being so critical. I am an engineer who designed for small quantity as well as for mass production and see "holes" in some designs. this critique is not to belittle but to try and help. I am sure that solutions can be found for my questions.

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  • 1$ Wireless Speaker That Connect's in 0.0000000001 Seconds !

    Kedar, why not also show a schematic? all those pics do not help without that.

    Guys!!! don't focus on the number of 000 he put there. he obviously just threw them in to emphasize that the "delay" would be minimal.

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