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118CommentsJoined November 6th, 2012
Electronics tech trained from USMC as test instrument repair and small missile maintenance. After service I worked locally as a tv/audio repair tech.

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  • Recycle Laptop Batteries - 12V Power Wall/Box!

    Your build is fine all but the buss bars, You need to make them bigger that can support the combined current of your cell group. For the number of cells you have, I would use 2 pieces of 10 Gauge copper wire soldered parallel on each cell group. You don't really need a charge controller as you are charging with a hobby charger, but I would use the balance mode with that. Think about what current each cell can output, then multiply x cells, this is what your bus bars need to handle along with the wires connecting between cell groups etc. Plan for the maximum even if you never use that and you wont go wrong. Also consider an automotive contactor switch to pass the current and use the smaller switch to work the high current contactor. All in all your design is fine, and hope my input is...

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    Your build is fine all but the buss bars, You need to make them bigger that can support the combined current of your cell group. For the number of cells you have, I would use 2 pieces of 10 Gauge copper wire soldered parallel on each cell group. You don't really need a charge controller as you are charging with a hobby charger, but I would use the balance mode with that. Think about what current each cell can output, then multiply x cells, this is what your bus bars need to handle along with the wires connecting between cell groups etc. Plan for the maximum even if you never use that and you wont go wrong. Also consider an automotive contactor switch to pass the current and use the smaller switch to work the high current contactor. All in all your design is fine, and hope my input is helpful. :)

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  • jtechian commented on Donald Bell's instructable Make Beautiful Solder Joints2 months ago
    Make Beautiful Solder Joints

    I also had the NASA soldering classes, although I managed only class 2 certified. I was a missile tech some 30 + years ago.This type of soldering was always called blob solder and is not a way to have a good solid connection. The clenched lead is always going to be the strongest. Semper Fi...

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  • jtechian commented on allgeierbe's instructable Custom Computer Box2 months ago
    Custom Computer Box

    That was a labor of love there! Looks really great. If you take an Am portable radio near the case and tune across the band, you will see why they normally use metal cases - RF interference. And I agree with others comments for cooling and dust, but all cases have those issues. I regularly take mine outside to blow the dust out. You did a beautiful job in all !

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  • DIY Variable Power Supply With Adjustable Voltage and Current

    Pretty, but you still need a power supply to feed this! Why didn't you include a transformer and rectifier circuit in front to give the needed dc supply ?

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  • jtechian commented on Attmos's instructable Say Goodbye to That Formica CounterTop!2 months ago
    Say Goodbye to That Formica CounterTop!

    Nice work! There is one big step that should be included I think would make this last longer. Add a 1/4" layer of plywood to the underside that will keep the strips stabilized and prevent any cracks that may appear over time. All in all this looks great!

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  • jtechian commented on BrittLiv's instructable Ozone Generator4 months ago
    Ozone Generator

    If you just wanted a timer, the manual dial timers for ac can switch on and off power each hour. The kind that you set with sliders for on and off time. So if a person would want to go quick and low tech, use switches for power settings and let this type of timer handle on/off part.

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  • jtechian commented on deba168's instructable How to Make a Bench Power Supply4 months ago
    How to Make a Bench Power Supply

    I would include an added load resistor on the output of around 20k to improve regulation. These kits never seem to include that. Nice work to inspire others to do their own kits. Give some hands on experience.

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  • jtechian commented on kimaj's instructable How to Make Homemade Ice Cream in a Bag4 months ago
    How to Make Homemade Ice Cream in a Bag

    I've read that soy in hard on the body as we cant digest it very well, along with artificial sweeteners. Best lean to moderation with real natural fats and sweeteners.

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  • jtechian commented on ThomasVDD's instructable Hard Drive Sander5 months ago
    Hard Drive Sander

    I have salvaged Hard drives from the old 8 inch to the small 2.25 laptop drives and never found a disk made of glass. All I found were aluminum that is coated with a thin film of platinum and ferromagnetic compounds. I never even heard about a glass platter. Maybe they were made in the beginning of hard drive manufacturing. Never too old to learn huh!

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  • jtechian commented on ThomasVDD's instructable Hard Drive Sander5 months ago
    Hard Drive Sander

    Um, a hd platter is an aluminum disk. Cant see that shattering. You may be thinking of cd disk.

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  • jtechian commented on happydupa's instructable Inexpensive Garage Lights From LED Strips7 months ago
    Inexpensive Garage Lights From LED Strips

    For longevity sake, when selecting a power supply - always double the capacity of the load demands. To run 40 watt load select a supply that can handle 80 watts. Also for those led strips, they get a little warm and would live longer if they are mounted on an aluminum strip. The strips may last as is for a while but you will notice some dimming on a few led's or just burn out.

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  • jtechian commented on makendo's instructable Laser-powered Light Saber8 months ago
    Laser-powered Light Saber

    I see the mist is rolling away after it get emitted, you could maybe put hard tubing on the output jets to get the fog to emit in a laminar stream. Nice build by the way! :)

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  • jtechian commented on thediylife's instructable DIY Cordless Cold Heat Soldering Iron9 months ago
    DIY Cordless Cold Heat Soldering Iron

    If the solder looks like it is balled out and not like say wax flowing up a lit candle wick, then the solder is not bonding to the connection. So if you don't heat both the wire and the connecting pad, the solder will not flow properly and bond to all metals ( PCB pad and wire) . I spent 3 weeks in electronics school, just on soldering and got a class 2 NASA certificate. Take some practice to get it right. I would not use this method of soldering since you cant well control the heat. In an emergency, you may get by, but not for a permanent solder.

    I noticed the pencil lead was getting heated red, why not try a carpenters pencil with the bigger lead or take apart some carbon zinc AA cells for the carbon electrode. Also for safety in using a Li-ion cell get a fire safety bag to put the cell in why using. Have fun anyway ya can :).

    A good solder joint requires the wire or copper to also heat up to bond with the solder. How well does this heating of solder alone, make for a good solder connect. By heating solder alone you may end up with what is called a cold solder connection that can fall off the wire or pcb pad. Also a NiCad battery would be somewhat safer the li-ion for this type of use.

    If you solder to battery cells, don't use a low power iron. Use a big ole solder gun, as this heats fast and more heat to a small spot. You don't want to heat more metal then you need and fast heat then cool is best for a battery. You should tin a spot on the cell first then cool cell, come back and solder your wire making sure the solder flows well, and cool cell quick. Battery will be fine this way.

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  • jtechian commented on pjnovas's instructable Easy and cheap lab regulator for any PSU9 months ago
    Easy and cheap lab regulator for any PSU

    One note.. If you do make more then one for different voltages on a project, they will all have a common ground IE say charging battery cells in series you cant set the voltage for each cell to do a balance charge. But this is a nice project and good share.

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  • jtechian commented on GreatScottLab's instructable Make Your Own Li-Ion Battery Pack9 months ago
    Make Your Own Li-Ion Battery Pack

    This arrangement is same as most laptop packs, so why go thru all the expense and just get a laptop pack - leave on the BMS it has and add your XT60 connector. All cells in the laptop battery are already spot welded as 3S2P.

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  • 6.3 kiloWatt Ground Mount Home Solar Array

    Mikes323, Your inverter does not need to run with a load. The power it makes does not need to be used up by sending it to the grid. Grid tie systems more or less simply reduces the cost of buying power from the utility company and unless you have a lot of solar panels, you wont see much go into the utility grid. You may be confusing the connection for wind generator systems, where the power it makes has to have a load to keep them from spinning too fast so they dump extra power into a load.Off grid solar is a system that primarily charges a battery bank ( lots of batteries in parallel) and these batteries the are connected to an inverter that does not connect to or need a utility grid. The inverter simply outputs 120 or 240 volt ac to your house. This type of inverter is called off grid...

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    Mikes323, Your inverter does not need to run with a load. The power it makes does not need to be used up by sending it to the grid. Grid tie systems more or less simply reduces the cost of buying power from the utility company and unless you have a lot of solar panels, you wont see much go into the utility grid. You may be confusing the connection for wind generator systems, where the power it makes has to have a load to keep them from spinning too fast so they dump extra power into a load.Off grid solar is a system that primarily charges a battery bank ( lots of batteries in parallel) and these batteries the are connected to an inverter that does not connect to or need a utility grid. The inverter simply outputs 120 or 240 volt ac to your house. This type of inverter is called off grid and even these don't require a load to keep them from burning out. Only wind generators require a load ! Hope it is more clear. Jim..

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  • jtechian commented on davebodnar's instructable Thunder & Lightning Animation11 months ago
    Thunder & Lightning Animation

    Nice work. Being Arduino controlled, I would change to lightning part to flash only at the beginning of the sound effect, the sound the thunder like a real storm does. All in all great work to help out the hospital.

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  • Supplying Power to a Rotating Object, Wirelessly!

    I had planned on making a 3d POV using a stack of 8 strips of RGB Led's that spins around a center hub, To power the drive and Led's, I had planned to use the air transformer to do the same as you did, and use wifi to send data from a processor to the display processor. Good IBLE you did to inspire, TY.

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  • Portable Battery Pack for Light Electric Vehicle

    You should have used life cells as they have more charge/recharge cycles then lipo, which equals more value in the long run. I do like what you have done and agree totally on the easy removable packs which makes having 2 complete packs (1 on charge with 1 on bike ) a quick swap and go. Good job !

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  • jtechian commented on awall99's instructable Arduino Data Glasses For My Multimeter 11 months ago
    Arduino Data Glasses For My Multimeter

    Very nice work. If possible why not make the lens inline to the oled screen and adjustable so as to accommodate other's eyes and also focus to the normal distance of the work. focusing from work piece to screen would be same as looking away from the probes. I do disagree with some comments for a speaking system as a lot of work places are very noisy and would drown out the voice. I do agree that the small plexi screen be changed to better then cd case as it looks clear but still is wavy and distorts to reflection. All in all you did a fantastic job!

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  • jtechian commented on NathanSellers's instructable Glowing River Desktop12 months ago
    Glowing River Desktop

    never mind, I saw the picts. Thanks

    Did I miss a photo of the whole top finished and one with lights dim to showcase the glow would be cool too. Nice job and voted for you!

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  • jtechian commented on thediylife's instructable Simple Arduino Home Energy Meter1 year ago
    Simple Arduino Home Energy Meter

    If you want to DIY a simple current transformer, Simply wind some wire around the feed wire with enough turns to produce a measureable voltage when current flows. Then you can adjust the calculations within the Arduino code. :)

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  • Programmable Battery Protection [Open Source]

    I would still for safety use a bigger trace rather then the parallel traces, and also the ground side tied to the ground plane - I would make the hole tied solid to ground rather then the cross hair solder tail. Best to over do it then under. I'm thinking of doing a similar protector for multi cell l-ion packs as IMO battery management boards really are not needed if your cells are all new or good shape. Also packs I want are for like solar power wall or EV. I want just the monitor protector to open a relay if the cell condition is out of tolerance. Yes a simple 555 or comparator would do that but an attiny would be cooler :)

    Have you ran 10 amp on this for a very long time as it looks like your traces need to be beefed up a bit more. I always try to err to the overkill direction.Considering that amp draw may burn the trace if ran for more then a minute or two once it gets hot and releases the bond to the PCB. I do like your idea and also wonder: when the micro is in standby, does it still monitor and react to the battery voltage changes or only when you wake it with the pin change button ?

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  • jtechian commented on deba168's instructable DIY All in One Solar Power Pack1 year ago
    DIY All in One Solar Power Pack

    Look into some used laptop battery packs, they have built in BMS. You can get them sometimes very cheap. Get a few packs and connect them parallel till you have the capacity you need. Your solar panel will still charge them and the built in BMS will keep them balanced. Hope to inspire :)

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  • jtechian commented on icreatable's instructable How To Build A Floor For A House1 year ago
    How To Build A Floor For A House

    Agreed, I would never use the OSB floor joist. One water leak etc and it starts to flex. After all OSB is just glue and wood shavings, and who want to live in a house that has been glued together. Best way on floors is rough cut true dimensioned lumber IMO. Other then that this is a good Ible.

    I feel bad for the family that gets this house! So many weak construction practices in this, from OSB to 2x4 perimeter wall studs ( limits the insulation ). This is cheaply built in a hurry to make a buck rather then workmanship and quality.

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  • jtechian commented on mikey77's instructable How To Make Your Own Sugru Substitute1 year ago
    How To Make Your Own Sugru Substitute

    Corn and potato starch is essentially the same, so yes you can!

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  • jtechian commented on Nicholasjames's instructable Wooden Bear Paw Flip Flops1 year ago
    Wooden Bear Paw Flip Flops

    I like this! I would have rounded the prints a bit to make them look more natural, as the imprints look to harsh. All in it is a fun idea..

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