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  • JohnC430 commented on tomatoskins's instructable Table Saw Disc Sander2 days ago
    Table Saw Disc Sander

    The grain of the wooden propeller is along its length. in this case, you will always have the centrifugal forces pulling the wood apart. The only way it could possibly work is with plywood which has layers so there is always something holding the grain together. Yeah maybe you can reduce the speed so the force is lower after all it is mV^2 so reducing the rpm by half (which will still allow it to work as a sander), will reduce the centrifugal force to 1/4th

    View Instructable »
  • JohnC430 commented on gzumwalt's instructable Money Maker!4 days ago
    Money Maker!

    why surprised? US is still using inches and pounds..... even thought the USD is 100 cents/$1. somewhat stupid i think.

    View Instructable »
  • JohnC430 commented on tomatoskins's instructable Table Saw Disc Sander4 days ago
    Table Saw Disc Sander

    yeah true

    now why didnt anybody else say that. throughout reading these suggestions i was thinking the same thing. i suppose it may not be strong enough and can split apart and perhaps do some bodily damage? maybe plywood would work?

    View Instructable »
  • JohnC430 commented on tomatoskins's instructable Table Saw Disc Sander1 week ago
    Table Saw Disc Sander

    no need to cut off the teeth. use it as is. just remember how it is made so u don't cut yourself.

    use ear plugs when u work.... just like u use an eye safety shield

    View Instructable »
  • JohnC430 commented on gzumwalt's instructable Money Maker!1 week ago
    Money Maker!

    WOW!!! TAKE $5 AND MAKE $1... Cool idea. i did that with the stock market several times in the past!!! just in bigger doses...

    View Instructable »
  • Tubing Roller-Bender From Scratch

    I saw your comment on a Solar Panelsystem and it looked quite professional; like it was written by an electrical engineer. Now I see one like it is written by a mechanicalengineer. I could respond to power electronics,but cannot make any comment on a mechanical structure like this one. You are a veryinteresting person. What is your background?

    I saw your comment on a Solar Panelsystem and it looked professional; like it was written by an electrical engineer. Now I see one like it is written by a mechanicalengineer. I could respond to power electronics,but cannot make any comment on a mechanical structure like this one. You are a veryinteresting person. What is your background?

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  • JohnC430 commented on bennelson's instructable DIY Solar Garage2 weeks ago
    DIY Solar Garage

    How do you know they are not running off one clock and are syncd? Theoretically you are correct however, even given the % drifts that you suggested the differences in voltage at 240 Volts would be around 0.6V. Micro-inverters are designed with output inductors which are intended to equalize the voltages of all the micro inverters and the load does not see the differences in voltage.

    Could you build a system that supplied some large portion of your needs and separate those loads from the utility and then not worry about net metering? Would you still be taxed on that?

    Theoretically you arecorrect but how do you know they are not running off one clock which is synchronizedby PLL to the line to with an 8MHz clock which will reduce the drift to almostnothing and will sync with the line almost perfectly; which is what I did on a 1MVAinverter?.However, even giventhe % drifts that you suggested the differences in voltage at 240 Volts wouldbe around 0.6V. Micro-inverters are designed with output inductors which areintended to equalize the voltages of all the micro inverters and the load doesnot see the differences in voltage.

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  • JohnC430 commented on Proto G's instructable 1000W Portable Induction Heater3 weeks ago
    1000W Portable Induction Heater

    yes you can heat treat just the edge. you have to shape the "coil". this time it will be a narrow long "coil". length as the blade and instead of piping, make it 14AWG stiff enameled covered copper wire.the blade must fit in the "coil" so make the width of the coil just a little more for the blade to fit in it. This way the magnetic field will be focused on the saw blade. 1 or two turns of wire. if this is not clear ask the question again and I will explain how it works.

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  • JohnC430 commented on Proto G's instructable 1000W Portable Induction Heater3 weeks ago
    1000W Portable Induction Heater

    48V/20A on eBay for under $60. plus 1KW with the 6 resonant caps; induction heater for $30. these are about the lowest prices i have seen. of course you have to add all the wires and connectors so approx $100. then go blow yourself up or start a fire at home :):):)

    No sense dying when ure having fun... thats the best time to go. :):)

    what is the cost of a hacksaw blade?

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  • JohnC430 commented on Proto G's instructable 1000W Portable Induction Heater3 weeks ago
    1000W Portable Induction Heater

    look up schematic for induction heater on youtube. there are dozens of schematics

    so at no load it draws 350 Watts. thanks that was the info i wanted to know.This is supposed to be ZVS, i.e. no switching losses, so where is the 350 Watts going? I am surprised. all in the capacitors? do the caps get hot without a load?

    Ok I see your point and i agree with you. after all it is drawing power. what is the input current with nothing in the coil and high input voltage. At what voltage do you run the unit from the Variac? u you mentioned 4s = approx 14.4V from the batteries; is that the voltage at which you measured the 19.3 Amps? I thought the limit of the board is around 35 Amps. So the limit is about 20 Amps?

    yeah. absolutely. iron is the best load for this type of heater

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  • JohnC430 commented on Simon Beggs Wood Turning's instructable Timber Light Saber 3 weeks ago
    Timber Light Saber

    making what? I can see that a lot of very precise work is involved in making this thing, but the Title said "lightsaber" so I got all excited to see how he did it and it was a let down because it has nothing to do with light. there is NO light. so why the title? He is a young guy and has an excellent skill which he learnt a skill from a very young age and has . So why the false Title?

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  • JohnC430 commented on Simon Beggs Wood Turning's instructable Timber Light Saber 3 weeks ago
    Timber Light Saber

    huge amount of wood dug out just to make tubes. u could have done that with pvc piping and some paint. where is the light? Never mind. you did a great job turning the wood.

    whats cool about this? it is supposed to be a "light saber" but there is not even one pic that shows it lit up. so its a billiard cue? too short for that. so what is it?Perhaps i missed the light?

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  • Add Wireless Charging to Any Phone: Using the LG-V20 As Example

    more than one way to skin a cat... this is the easy way.. magnetic charging:check this out:https://www.ebay.com/itm/Hot-2-4A-Micro-USB-Chargi...it has a permanently plugged in connector in the phone and a .... well look at it... $1. how can u beat that?

    check this out:https://www.ebay.com/itm/Hot-2-4A-Micro-USB-Chargi...it has a permanently plugged in connector in the phone and a .... well look at it... $1. how can u beat that?

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  • How to Make a Touch Switch Using One Mosfet

    Holy smoke. yeah.. give him hell for what he said.... and keep going. dont stop your mouth,,,, on and on and on....

    IRFZ44 has a huge gate... soitis ok for this application. dont try it with a 2N7000... 2N7002... etc.

    what transistor did you use? when u touch the gate u are putting a charge on it. charge that ur body is picking up from radiation from anything around you, e.g the ac wiring in ur house. a big transistor can gave big gate capacitance and can take the charge, however if u use a small transistor with a small gate, it will go poooffff. just another thing for newbies to know.

    well one can see by the way he is holding the wires to solder that he is quite experienced in soldering stuff... so perhaps he also knows a lot more than just that little circuit... good for you buddy... teaching the newbies a little bit of fun stuff

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  • Four Colour LED Grow Light With PWM Dimming

    thanks. can you actually visually discern the difference?

    thanks.

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  • Four Colour LED Grow Light With PWM Dimming

    I am confused by your description of deep red and red LEDs. can you please add a link to where you buy them or a spec sheet or even the wavelengths of the two?thanks

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  • JohnC430 commented on GreatScottLab's instructable Make Your Own Solid State Relay1 month ago
    Make Your Own Solid State Relay

    check the spec sheets for the diac and the triac. they will tell you how much current is needed to fire the triac and the diac Vbr. when the diac fires at Vbr the current flows thru the resistors to the Triac gate.

    "Just use a flyback transistor across the solenoid coil" you mean use a diode across the solenoid coil

    at the local barber shop

    dont bother about that.

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  • JohnC430 commented on mr_fid's instructable Radio Controlled Electric Hovercraft 1 month ago
    Radio Controlled Electric Hovercraft

    wonderful job. well done. congratulations and thanks for sharing

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  • The Most Useless Machine EVER!

    i laughed when i saw the funny title.i was going to pass but im glad i didnt. that $1 box is a very useful item.thanks for sharing.

    View Instructable »
  • LM317 Based DIY Variable Benchtop Power Supply

    "but if you are using the power supply for any serious business 20 mV is "VERY HIGH" a 20mV ripple can make unwanted noise in a sound recording device"the switching ripple is usually at or above 100KHz and is so easily filtered. who can hear that frequency?people look for ways to reject stuff without actually testing and trying to understand why noise occurs in their system. just hit and miss blindly always costs more and u learn less. study the problem and u will find that smps is ok in almost any application. a small filter works wonders in cases where the equipment is noise sensitive. when people dont want to think or analyze or are just impatient or just dont have the knowledge of how to do it they, revert to linear p/s cos its easy. Linear is ok for about 1...

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    "but if you are using the power supply for any serious business 20 mV is "VERY HIGH" a 20mV ripple can make unwanted noise in a sound recording device"the switching ripple is usually at or above 100KHz and is so easily filtered. who can hear that frequency?people look for ways to reject stuff without actually testing and trying to understand why noise occurs in their system. just hit and miss blindly always costs more and u learn less. study the problem and u will find that smps is ok in almost any application. a small filter works wonders in cases where the equipment is noise sensitive. when people dont want to think or analyze or are just impatient or just dont have the knowledge of how to do it they, revert to linear p/s cos its easy. Linear is ok for about 1 amp or less, and when u get to high power then u have to go to smps.

    yeah, i agree. linear is ok for around 1 amp or less, so its simple and ok for the preamp.

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  • LM317 Based DIY Variable Benchtop Power Supply

    you are correct. you use the p/s for the application. not everybody is making an FM transmitter. also FM does not react to changes in amplitude. only AM does that, so obviously there was something wrong in what u were doing. so it was causing noise and u changed to batteries. battery internal impedance high and you may not have noticed the differences. but again, you must use the correct p/s for the application.

    did you look at the specs for ripple rejection for the LM317? most smps run at or above 100KHz and the rejection at that frequency is almost nothing. so whatever noise is atthe input will be seen at the output. instead of adding a linear, just add a very small LC 10uH+10uF (ceramic) filter to the output of the smps and u will have almost no ripple to talk about.

    actually with smps you do not need a separate p/s. just add one more or two or three, winding(s) to the coil, rectifier and diode (inductor or transformer) and u will have another output.

    actually with smps you do not need a separate p/s. just addone more or two or three, winding(s) to the coil (inductor or transformer) rectifier(s) and diode(s) and u willhave another output.

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  • JohnC430 commented on TueBjørn's instructable 100W LED - Flashlight2 months ago
    100W LED - Flashlight

    yeah i found one like that. trying to buy it but the price comes up in $CDN and i am in USA.

    hey how come nobody answered this post?

    yep!!! i give it 20 minutes approx. 2.5A-H batteries 2.5/7*60 = 21 mins and that's without taking the Boost converter losses into consideration

    can u please put the link for that flashlight?

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  • JohnC430 commented on StephenCartwright's instructable Floating Map2 months ago
    Floating Map

    what was the point of you recording each hour you spent in your wife's hometown?

    yeah "organic feel" is good and so is "collecting data more frequently". WOW Amazing work of art.

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  • JohnC430 commented on khinds10's instructable Magic Mirror2 months ago
    Magic Mirror

    I never owned a Tablet so forgive my ignorance about it. does it connect to the internet? If so, can the android tablets be set to show the weather without all the Raspberry stuffs?

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  • JohnC430 commented on TueBjørn's instructable 100W LED - Flashlight2 months ago
    100W LED - Flashlight

    here is another way to adjust the power:https://www.ebay.com/itm/100W-1-OHM-High-Power-Wir...

    "One of the trimpots on the boost converter chip is for limiting current."NO!!!! it is for adjusting the Vout. there no current adjust on that boost

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  • LM317 Based DIY Variable Benchtop Power Supply

    "Poor load regulation compared to SMPS power supply design."why do you say that? unless u are doing something wrong in the output wiring, or violating the minimum Vin-Vout approx 2V requirement, this is not the case. It has 0.3% load and line regulation capability which is better that what most engineers make with smps.VO ≥5 V,IO = 10 mA to IMAXTJ = 25°C typical 0.1%, max 0.3%check the datasheet http://www.st.com/content/ccc/resource/technical/d...

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  • JohnC430 commented on GreatScottLab's instructable Make Your Own Simple Theremin2 months ago
    Make Your Own Simple Theremin

    oh yeah, after asking that question i went on to watch for the next few hours of demos on YT and there were plenty. thanks for explaining.

    oh yeah, after asking that question i went on to watch for the next few hours of demos on YT and there were plenty. thanks for explaining.

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  • JohnC430 commented on K3WFN's instructable Building a Solar Projector2 months ago
    Building a Solar Projector

    maybe you can use the disc of an old HDD. those are front face mirror finish and made of aluminum

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  • LM317 Based DIY Variable Benchtop Power Supply

    the schematic image is blurred and fogged up. very very light lines and blurred.

    it was not the ripple that was disrupting it. the transmitter was picking up radiated and conducted emissions. look in the AARL handbook and they tips on how to use a switcher for radio.

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  • LM317 Based DIY Variable Benchtop Power Supply

    make one of the simpler ones..... and then do it several times and you will have this one.

    View Instructable »
  • JohnC430 commented on How-ToDo's instructable Solar Mendocino Motor2 months ago
    Solar Mendocino Motor

    very cool project. thanks for sharing.

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  • JohnC430 commented on tanner_tech's instructable DIY Induction Heater2 months ago
    DIY Induction Heater

    Did the 12V/50 Amp supply have any current control? i.e. current limit adjustment? the batteries do not have any current control and could possibly source even more than the max 50 Amps that the power supply can source. so really, what caused the FETs to blow? over voltage or over current? you have a scope there and can check the drain voltages of the FETs, how high do they go?

    you need the 1KW unit.i dont think 200 Watts will be enough

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  • JohnC430 commented on tanner_tech's instructable DIY Induction Heater2 months ago
    DIY Induction Heater

    are u trying to make hot water?

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  • JohnC430 commented on dedehai's instructable Batteryless Bicycle Safety Light 2 months ago
    Batteryless Bicycle Safety Light

    whats cool about this is that the fragile coil is still protected in its original box. great idea.

    This looks like a great idea. i have been wanting to do it ever since i saw an advertisement for one of those. too lazy....1 second is plenty. the wheel is moving and will keep charging the cap. watching your video the interval is slightly less than 1 sec so the cap charges up to 12V, it will stay lit and of course you can add more magnets to increase the pulse rate. Use one LED as a rectifier and put the cap across other two. when you stop the two will stay lit for a second or so. I read your blog. the coil resistance is 400 Ohms. that's more than enough for current limiting so an added resistor is not required. so just add a 1000uF cap across two LEDs but make sure the + of the cap is at the cathode (flat edge of the diode base) of the first diode and the neg of the cap is where the t...

    see more »

    This looks like a great idea. i have been wanting to do it ever since i saw an advertisement for one of those. too lazy....1 second is plenty. the wheel is moving and will keep charging the cap. watching your video the interval is slightly less than 1 sec so the cap charges up to 12V, it will stay lit and of course you can add more magnets to increase the pulse rate. Use one LED as a rectifier and put the cap across other two. when you stop the two will stay lit for a second or so. I read your blog. the coil resistance is 400 Ohms. that's more than enough for current limiting so an added resistor is not required. so just add a 1000uF cap across two LEDs but make sure the + of the cap is at the cathode (flat edge of the diode base) of the first diode and the neg of the cap is where the two diodes and the coil meet. draw the schematic of it on a piece of paper so you know where to make the connections. in any case i don't see the value of this modification.

    This looks like a great idea. i have been wanting to do it ever since i saw an advertisement for one of those. too lazy....1 second is plenty. the wheel is moving and will keep charging the cap. watching your video the interval is slightly less than 1 sec so the cap charges up to 12V, it will stay lit and of course you can add more magnets to increase the pulse rate. Use one LED as a rectifier and put the cap across other two. when you stop the two will stay lit for a second or so. I read your blog. the coil resistance is 400 Ohms. that's more than enough for current limiting so an added resistor is not required. so just add a 1000uF cap across two LEDs but make sure the + of the cap is at the cathode (flat edge of the diode base) of the first diode and the neg of the cap is across t...

    see more »

    This looks like a great idea. i have been wanting to do it ever since i saw an advertisement for one of those. too lazy....1 second is plenty. the wheel is moving and will keep charging the cap. watching your video the interval is slightly less than 1 sec so the cap charges up to 12V, it will stay lit and of course you can add more magnets to increase the pulse rate. Use one LED as a rectifier and put the cap across other two. when you stop the two will stay lit for a second or so. I read your blog. the coil resistance is 400 Ohms. that's more than enough for current limiting so an added resistor is not required. so just add a 1000uF cap across two LEDs but make sure the + of the cap is at the cathode (flat edge of the diode base) of the first diode and the neg of the cap is across the two diodes. draw the schematic of it on a piece of paper so you know where to make the connections. in any case i don't see the value of this modification.

    This looks like a great idea. i have been wanting to do it ever since i saw an advertisement for one of those. too lazy....1 second is plenty. the wheel is moving and will keep charging the cap. watching your video the interval is slightly less than 1 sec so IF the cap charges up to 12V, it will stay lit and of course you can add more magnets to increase the pulse rate.

    View Instructable »
  • JohnC430 commented on Tuba Fett's instructable Exotic-Wood Acoustic Marvel2 months ago
    Exotic-Wood Acoustic Marvel

    yeah, he should have mentioned the Trobla in his article. its ok to copy something, after all we all build on something that has been done before, but one also needs to give credit where credit is due.

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  • JohnC430 commented on Downunder35m's instructable Powerful Yet Simple Induction Heater2 months ago
    Powerful Yet Simple Induction Heater

    the schematic you showed says the coil is 1.5mH. in reality it is more like 1.5uH or less could be even half of that. apart from that you did a great job. did it work the first time you turned it on or did a few transistors blow up before you got it working? i have seen a few of these designs and peoples attempts at getting it started and quite a lot of blown transistors. i want to try this out but it seems to me that perhaps the circuit is not that reliable to start with hence the large number of blow-outs. Please enlighten me. thanks for your reply.

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  • JohnC430 commented on tanner_tech's instructable DIY Induction Heater2 months ago
    DIY Induction Heater

    what are you planning to do with them? there are small ones "rated" at 200 Watts and then there is one that they tout at between 1000 to 1200 Watts. all working within the range of 12 to 36VDC input power and all requiring an external DC power supply. In order to run the highest power one you need a power supply rated at 24V and 50 Amps = 1200 Watts. however if you are only going to load it with about 200 Watts then you can do with a smaller power supply. 200W / 12V = 16.7 Amps (approx 20 Amps) if you have a 20 Amp battery charger it will work for this. but of course it is an additional cost over the cost of the ZVS induction heater that you can buy from eBay.

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  • JohnC430 commented on mikeasaurus's instructable Sliced Wood Coasters3 months ago
    Sliced Wood Coasters

    LOL putting coasters on that weathered wooden outdoor bench hardly seems worth the effort of making them. they look nice and should be on your coffee or dining table.Thanks for sharing.

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