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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 Relay3 weeks 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 3 weeks 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.

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  • 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.

    View Instructable »
  • 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 - Flashlight3 weeks 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 Map4 weeks 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 Mirror4 weeks 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 - Flashlight4 weeks 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 Theremin4 weeks 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 Projector4 weeks 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.

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  • JohnC430 commented on How-ToDo's instructable Solar Mendocino Motor1 month ago
    Solar Mendocino Motor

    very cool project. thanks for sharing.

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  • JohnC430 commented on tanner_tech's instructable DIY Induction Heater1 month 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 Heater1 month 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 1 month 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...

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    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 Marvel1 month 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 Heater1 month 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 Heater1 month 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 Coasters1 month 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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  • JohnC430 commented on tanner_tech's instructable DIY Induction Heater1 month ago
    DIY Induction Heater

    you can make several coils and connect them in series and place one on each spot you want to heat. coils will work without you having to insert something into them. just wind them flat like a pancake and connect the start of the first one and then end of the last one to your driver circuit

    for such a simple application you can even use a Variac and reduce the output voltage to a couple of volts and use the 60Hz ac. or a variable Dc supply and make connections across the areas you want to heat.welders use 60 HZ AC and what u want is only a few degrees increase in Temp

    also one more thing i forgot to mention. IRF520 has a max Vds of 100 volts and the IRF250 are 200 volts. we dont know why his transistors blew up, whether due to overvoltage or overcurrent. so...

    for such a simple application you can even use a Variac and reduce the output voltage to a couple of volts and use the 60Hz ac. or a variable DC supply and make series connections across the areas you want to heat.welders use 60 HZ AC and what you want is only a few degrees increase in Temp. Ok i see the picture now. #2 looks like it should work, but the traces are too thin and will burn up. you want a few amps flowing.

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  • DIY Industrial Beam Chandelier With LED Edison Bulbs

    sounds like the ones who did that were a bit daft!!

    what do u mean "borrowers"? every person who owns a house with a mortgage is a borrower...... or is that the name of a movie or something?

    Great Indestructible! (auto correct did that and i left it as a joke) when i saw the design i remembered the last big earthquake we lived thru. Northridge Eq and we were in the middle of it and then seeing that made me burst out laughing.

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  • Cost Effective Plastic-tub Wicking Beds

    i dont understand the purpose of the weed mats below the soil. is it just to separate the soil from the gravel? if so then some of those cotton hand towels that are sold in bulk would be cheaper to use. i checked the prices of weed mats and they are very expensive.

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  • JohnC430 commented on BuenaTec's instructable DIY - Magnetic Connectors1 month ago
    DIY - Magnetic Connectors

    thanks for the link

    WOW thanks for sharing. i recently bought a bunch of 32700 size batteries and needed a battery holder to hold them for charging. this size of holder is not readily available and i made one out of wood, but when i insert them into it, one sticks out more than the others and they all need to line up exactly because i dont have the little springs that are located at the negative end of the common holders. i ordered them from eBay but its a long road from China.this idea of yours solves my problem. i have about 20 magnets like those you show. wonderful solution. i was wondering how you would connect the wires to the batteries. soldering may damage the magnets but you even had a great idea to solve that too. you are a brilliant innovator. thank you! thank you! thank you!

    not too cool to forget something that important. but anyway, still thanks for sharing.

    Thanks for the link. looks like this guy just plagiarized your old idea. thanks for putting this straight. whatever it is, it is a great idea and for me very timely. check my post above. it applies to you. thanks again.

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  • JohnC430 commented on tanner_tech's instructable DIY Induction Heater1 month ago
    DIY Induction Heater

    put them in parallel. all the gates together, the drains together and all the sources together; i.e. connect all the same pins together but remember you need to also cool them so first mount them on a heat sink and then start wiring them together. try to keep the interconnecting wires short.

    yep!!!! easy

    make the coil with copper tubing and run water thru the tubing. check them out on eBay

    Compared to Iron, copper has very low resistance. I^2xR = P. when R is small you need more current to heat it. So yeah, your power supply must be capable of supplying a lot of current just to get it hot.

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  • JohnC430 commented on scoochmaroo's instructable 15 Unusual Uses for Cheap Vodka2 months ago
    15 Unusual Uses for Cheap Vodka

    A vodka rinse is a great solution for dandruff or dry scalp. Mix one cup of vodka with two teaspoons of rosemary and let sit for two days. taste it while it is sitting. try a couple of spoonfuls after meals. One way or another in two days it will be finished. buuurppp. i cant believe i drank it all

    a friend and I used to finish a full large bottle of Scotch in an evening. we also danced thru the evening so i suppose a lot of the alcohol evaporated thru our breath or sweat etc. we never got "rolling" drunk.the small muscles are affected first... the ones in your eyes so the room seems to spin a little. when we finished the bottle we would go out the door, call a cab and go home. end of a wonderful happy evening.

    so u got drunk from the fumes and since it was odorless u did not know why u were drunk and then after work u went to the local bar for a drink so that u would know why u were drunk.

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  • Simplest 12V to 220V DC to AC Power Inverter DIY

    who cares about clean sine wave? chopping the DC is enough to activate the primary winding. flux changes in the core and transfers energy to the secondary. thats all thats needed. if he added a capacitor to resonate with the secondary it would give him rounded edges. but again who cares about sinewave. Most of the commercial inverters dont make "clean" sine wave. they make modified sine wave which are square waves with a gap in the middle.

    put a cap across the contacts and it will absorb the spikes which usually arc across and burn the contacts

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  • Blue Light Blocking Glasses From Pill Bottles

    i agree with you. in this case you're only trying to very slightly soften it

    Flattening the plastic is much easier with two people, one to hold the plastic and one to operate the heat gun......ok you hold the little plastic bottle with both hands and spread the edges wide and I will spray it with the heat gun.

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  • How to Make an Automatic 12V Battery Charger

    what he sees on the display will be what the battery is getting. at 14 volts there is hardly any current flowing into the battery so the drop on the wires is minimal. no more than a few 10's of millivolts. but yes it is a good idea to top it off at 14.3 volts once a week.

    LOL

    similar yes. he has the buck converter set for 13.8 VDC. if ur solar panel has between 16 and 24 Volts output then u can connect it and it will definitely charge the battery. you can also set the converter output current like he did to the max that ur solar panel will supply. you can connect it 24 hours. of course at night it will not do anything and then in the morning it will start charging again. there are chargers called MPPT chargers which are a lot more expensive, but this will do the job nicely. (The one he is using costs under $5). Dont expect too much current out of it though. the heatsinks are undersized.

    I am familiar with the Enfield rifle, but what the heck is a 1963 Royal Enfield Bullet? i am assuming it is a battery but why the Titile?

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  • JohnC430 commented on mikeasaurus's instructable Drill Press Drum Sander2 months ago
    Drill Press Drum Sander

    another good idea. wow so many in one 'dble

    another great idea

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