I really didn't need another amplifier as I have lost count of how many are around the house, perhaps as many as 15 or This project was an exercise in what would happen if I combined some interesting concepts.
Posted on February 12, by Jim Toroids with many turns of secondary Project on ohms law are very useful for AC current sensing and measurement because you can just pass the wire carrying the current to be measured thru them. Well, unpleasant unless you have one of these cool toroid winding machines.
After I finally figured out how the machines work, I thought about building one. But there are too many strange and precision parts, especially if you want to wind small cores — which I do.
So how do you quickly and simply wind wire on a closed loop toroid? Cutting Well, duh — you cheat. Fortunately, a ferrite core is kind of brittle, and if you score it nicely, it will often break fairly cleanly.
The first was to just saw halfway thru before cracking it. The material cuts very nicely with a hacksaw. That approach provided a nice break, but lost so much material that it really felt like performance of the core would be compromised.
I never bothered to wind it. In the spirit of scoring plastic, I tried a Stanley knife. In any event, scoring the outside and inside! I generally held the core in a vise and whacked it to effect the break. Results varied from about perfect to needing some additional reassembly.
By clamping the pieces together tightly, the gap should be small enough to not hurt the magnetic properties too much. When there are chips, it may be easier to glue the chips back carefully as a separate step before you put the two halves back together.
If there are chips missing, abort and try a new core. Winding While you could wind the secondary by hand, my strong first choice would be to let a drill or something turn the core while I guide the wire. Most of the winding will be about midway between the two breaks, so that part should be on the centerline of the spindle to minimize wobbling.
You could use a dowel nicely shaped concave to fit up against the core as the spindle, but the bottom would probably underlap? If you handle it gently while winding, hot melt is a great way to hold the spindle to the core half temporarily. Having a helper to count the turns is convenient.
Another, probably less accurate approach is using an estimate of the average diameter of one turn of the winding and the desired turn count to compute how much wire it will take.
Thanks to Ti Leggett at Workshop 88 for the video. Having them all bunched up together is fine. Putting it back together Super glue seems good because the breaks are clean and it introduces such a minimal gap at the joints. Something like epoxy, that provides filler and some thickness to the glue joint would require that you clamp the core halves together quite tightly to squeeze out as much glue as possible.
After you glue the core halves together, bring the ends of the zip tie around the top of the core and pull it tight. If you were quick, it could even provide clamping while the glue dried.Project Report Format. Project report is a written evidence of tasks, processes and activities that are undertaken and accomplished by the students while pursuing their projects and implementing it.
Oct 02, · Parallel and Series Resistor Circuit Analysis Worked Example using Ohm's Law Reduction | Doc Physics - Duration: Doc Schuster 1,, views.
Experiment with an electronics kit! Build circuits with batteries, resistors, light bulbs, and switches. Determine if everyday objects are conductors or insulators, and take measurements with an ammeter and voltmeter. View the circuit as a schematic diagram, or switch to a lifelike view.
It wasn’t a problem with the frame connectors or their installation, mind you. It was simply a combination of the length of the fuel line with it’s various bends, and the law of physics.
A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.. The measuring instrument called a potentiometer is essentially a voltage divider used for measuring electric potential (voltage); the component is an implementation of the. Oct 02, · Parallel and Series Resistor Circuit Analysis Worked Example using Ohm's Law Reduction | Doc Physics - Duration: Doc Schuster 1,, views. Experiment to Verify Ohm’s Law Rolla Tyas Amalia Grade 11 “For a conductor at constan.
Very gud to complete the class 12th Physics investigatory project on Ohm's Law. Did you know that electrical current is affected by the voltage and resistance in a circuit? In this lesson, we'll use Ohm's law, which tells us how current, voltage, and resistance are related.