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charles543

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  • charles543 commented on cfoote7's instructable PiSwitch

    I haven't taken the time to read this instructable in detail. but I noticed that it jumped right into building the PiSwitch, and never did answer the basic questions of What is a PiSwitch and why would I want one?

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  • Why just fill the barrels 1/3 full to check for leaks. They can leak from anywhere.

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  • charles543 commented on DIY Academy's instructable DIY Ping Pong Table

    A ping pong table is 5' X 9', not 4' X 8'. That makes it complicated building one, because plywood normally comes in 4' X 8' in this country. 5' X 9' has to be special ordered, and I have heard it is quite expensive. It could maybe be pieced out of 4' X 8' sheets with the joints 1' from the net. It is not too often the ball would land there. It would take 3 sheets of plywood to do it.

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  • charles543 commented on Nematic!'s instructable DIY Power Supply !

    An LM317 powered by 12V will only give you 10.5V. You need voltage 1.5V higher than your desired voltage (25.5V for 24V). A digital boost converter might be the way to go.

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  • charles543 commented on carl5blum's instructable Semi-Cordless Drill.

    Why not run the cord directly into the drill, and eliminate the battery case?

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  • Ohm's law states that the Induced current through a conductor between two points is directly proportional to the Electromotive force across the two points, and is inversely proportional to the Resistance. That's the way George Ohm said it.

    The best way to control led brightness is to power it with a current source. led brightness is controlled by the current flowing through it. A current source is not hard. You simply put a resistor in series with the load, and use a voltage regulator to control the voltage across the resistor. I=E/R

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  • There is one ground in a PSU. There are multiple black wires, but they all connect to the same place on the printed circuit board. All the red wires connect to the same place. Same for yellow and orange I know this because I have torn PSUs down to the printed circuit board. That is why as it says in the instructable you can use any black wire.

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  • What size wire did you use to wire your power supply?

    Unless I missed something, this is a plastic case. Why would you want to ground a plastic case

    The regulator is limited to 10A. 20 gauge wire is rated at 11A for chassis wiring.(http://www.powerstream.com/Wire_Size.htm)It is only rated at 1.5A for power transmission. It all depends on what you are using it for. I would probably use 18 Gauge.There would be nothing wrong with 16 Gauge. Looking at the pictures it looks to me like the wiring is adequate.

    The reason higher currents are allowed in Chassis wiring is because they are all short runs. The device can only draw what the regulator can deliver which is 10A. The reason I know is because I followed the link back to where the regulator came from, and read the specs. 10A (MAX).I was just thinking about the variable output. I wasn't thinking about the fixed outputs. If I were building it, I would cut the connectors off, and use the wires out of the computer power supply. You can use multiple wires of the same voltage to have plenty of ampacity. Computer power supplies do have short circuit protection. They also have fuses.

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  • Steel is pretty expensive. It would seem that this could be built out of 2x4 faced with a steel surface(like heavy gauge sheet metal), and get the job done for a lot less. For the base you could use a 2x4 with sheet metal attached to the top. In place of the bending angle you can use a 2x4 covered with sheet metal hinged to the base. For a hold down you can use a 2x4 with steel strips under the front and back edges. You can counterbore holes in the hold down and base for springs. you can use a 2x4 ripped in half for handles.

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  • How strong do you need for the bond to be for this project? Most anything down to chewing gum would be strong enough for this.

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  • The keyboard and touchpad in your laptop like most laptops are backwards. With the touchpad close to the user, you tend to accidentally touch the touchpad, which messes up your typing. If the keyboard is close to the user, the problem is solved.

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  • In a tent, dome, whatever you need ventilation to dissipate moisture from breathing. Yes there will be heat loss. You can't have everything. It sounds like you need a much smaller dome for one person's body heat to heat it, or you need more heaters(more people). Your dome has a lot of exposed surface, and will lose a lot of heat.On a different thought, could the bottom row of triangles be eliminated? That would give the same bottom diameter, and would still give about a 6' center height, which is enough for most of us. It would probably help a lot toward your heating problem, since the heat would have less room to go up.To secure the tabs together, you could use 2 boards about 1" X 3/8" X an appropriate length for the length of the tab. drill holes through the boards and the tab…

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    In a tent, dome, whatever you need ventilation to dissipate moisture from breathing. Yes there will be heat loss. You can't have everything. It sounds like you need a much smaller dome for one person's body heat to heat it, or you need more heaters(more people). Your dome has a lot of exposed surface, and will lose a lot of heat.On a different thought, could the bottom row of triangles be eliminated? That would give the same bottom diameter, and would still give about a 6' center height, which is enough for most of us. It would probably help a lot toward your heating problem, since the heat would have less room to go up.To secure the tabs together, you could use 2 boards about 1" X 3/8" X an appropriate length for the length of the tab. drill holes through the boards and the tabs, and secure them with carriage bolts and wing nuts.Charles

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  • Would it be good to tap the hole again after gluing it?

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  • If you take a close look at your smaller bits, you will find they have a chisel point too. It's just smaller.1/2" diameter is 4 times the area of 1/4". Maybe 1/4 the speed would be more appropriate.

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  • Why do you have an ice maker and ice trays?

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  • 5A at 12V is 60W, not 100W. AWG 14 wire would be more than adequate. It is easily good up to 15A.

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  • There is local mechanical action where the reaction is occurring. That is what all the bubbling and fizzing is about. I don't know if this is effective on the clog or not. I don't care. I use a Zip-It type tool. It is quick, effective, no chemicals.

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  • Zip-It will reach through the trap. You don't need to take anything apart.

    Zip-it drain cleaning tool at Walmart for $2.24. It's a barbed plastic strip. It works great on tub and sink.

    We already know all of that. Wabpita was talking figuratively about boiling because it is a physically similar type action. I'm sure everyone else understood that. The mechanical action could help loosen the clog.

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  • Untill they came out with 12V tubes.

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  • Maybe I'm missing something. The text talked about using the website to identify stones. Where is that website?

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  • I would be interested in a vegetarian version. Vegetarian, not vegan.

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  • I bought 2 lamps a while back. a magnet sticks to them. They have the UL label. They Have 2 prong plugs. I have seen a lot of metal lamps with 2 prong plugs. Virtually all lamps use a metal socket. The vast majority of lamps have a 2 prong plug. without the third prong on the plug, there is no ground.The only place there could possibly be a problem is in wiring of the socket. If there are any stray strands, that is covered by the cardboard sleeve, unless you are extremely sloppy.I think the problem is greatly overrated by some.By the way, I am an electrician.

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  • I am an electrician. I have never heard of aluminum as a contact surface. I have heard of brass. If there is any rust or dirt, a flat surface will not bite in. A pointy surface will.

    to Phil B:Car batteries can deliver 400A or more. I like 4 batteries. The arc is easier to start, and is much more stable. I don't have 4 car batteries, and it would be way too expensive to buy them. I saw a video on youtube where a guy was using 4 5 amperehour batteries out of uninterruptible computer power supplies. I found 4 9 amperehour batteries on ebay for $50.00 and a 48V charger for $9.95. With cheap jumper cables for leads I was burning up 3/32 rods. Now I am using #14 wire leads 10' long for leads. They seem to work pretty well. I want to get some steel band to come off the positive end of my battery, so I can clamp onto the band at different places to get different currents. I figure I can get about 7 minutes of arc at 100A.

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  • charles543 commented on Phil B's instructable Improving a Hand Truck

    I would put the ratchet mechanism on the back of the hand truck, and leave the hooks free. That way you can hook the straps around the box, and tighten up.

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  • rafununu, the power supply is set for 5 amps. That limits the current to 5 amps.

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  • Where do I find the keyboard.

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  • What kind of sharpening jig are you using?

    What is the generic name for the type of sharpening jig you are using, so I will know what to search for.

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  • charles543 followed boats, gadgets, computers, reuse and 6 others channel
      • How to Surface Mount Solder Using Solder Paste
      • Setting up an 800X480 5inch HDMI LCD for Raspberry Pi
      • How to Set up a Micro SD Card for the Raspberry Pi
  • 3 of your eBay links in the parts list say, "Doesn't post to United States". What are we supposed to do?

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