What is the purpose of a diode in a codless drill or power screwdriver?
446937
No wonder all the engineering jobs go over seas. Nobody here wants to learn.
476537
It is a semiconductor, so would probably be good for machinery like Silicon. Most likely it would be used for computers and lasers somehow.
11978
It's not the best solution, but a piece of iron pyrite or germanium will make a diode.  Its the same materials that you can use as the crystal in a crystal radio.  There's no telling exactly where you'll have to connect the wires to make it work properly, so you'll have to do some experimenting with it.  I've also heard of rust making a good diode for a crystal radio.
25253
You are on the right track. It relies on inductive charging:\n<quote>\nIf you own an electric toothbrush, there's a good chance that it has a completely sealed toothbrush unit. The toothbrush rests on the charger without any metal contacts to connect the toothbrush to the base. This has the great advantage of allowing the toothbrush to be completely sealed so that water cannot enter through exposed contacts. It also avoids any problems with water getting into the contacts and shorting out the charger.\n\nThis sort of sealed arrangement is called inductive charging. Essentially, the toothbrush and the base form a two-part transformer, with the base having one part of the transformer and the toothbrush having the other. When you slide the toothbrush onto the base, the complete transformer is created and charge can flow.\n\nThe base contains one of the coils and the metal bar. The toothbrush contains the second coil. When you drop the toothbrush onto the base, you create the complete transformer!\n</quote>
137463
Silicon diodes - general purpose: rectifiers, clampers, etc\nGermanium diodes - low voltage drop\nSchottky diodes - fast switching\nTunnel diodes - fast switching, oscillators\nZener diodes - voltage regulators\nLight Emitting diodes (LED) - displays
36270
Try, Edmond scientific co,(catalog avail. on the www)\nAlso, they have been found for sale on e-bay.\nOne could also find the nearest Cub Scout leader, and ask for one of thier catalogs.(ez build,simple)\nThere are books,such as "The Ameteur Radio Handbook",\nand more at the local library. \nDuring World war two, Soldiers built them using a "Gillette Blue Blade" double edged razor blade as the diode. I have used this as an example in my classes for years, and while not the easiest to tune, they do work, and they are cheap.
29175
They're essentially hot-swappable drives which contain all of the interface components on the other side of the handle. They're "Hard drives on a mounting plate."\n\nHope that helps.
936541
This is to protect the main appliance.  Mostly the three prong socket configuration has one.  Fuse is always for protection, either it is current sense or temperature sense.  anything that will go over the fuse range is enough to bust it and thus avoided further damage to your appliance.
351265
avalanche breackdown is just a breakdown mechanish, it does not have a symbol, there are other diodes that break down by that mechanism, like the zener diode,avalanche photodiode etc. and these doides have symbol.
145303
Basically, you just need two different types of metals to generate a current. I assume your using copper as your other metal type.\n\nIf you dont have any zinc wire, you could try using a galvanized (zinc coated) screw.\nOr if you want to use another metal all together, try Aluminum in the form of Aluminum foil.  An Iron nail or a chunk of lead would also work, but not as well.
6099
I may be living in the past but I see transistors every day.  The 2-diode analogy is pretty close to the mark.  They meet at the base, pointing in for PNP and out for NPN.  Check them that way with your multimeter set on diode setting.  If the reading is inconclusive you may have to de-solder them from the circuit.
395873
The back EMF that must be protected against is often called inductive kick. It's a voltage spike that happens when you interrupt the current flowing through an inductance such as a solenoid or relay coil. The diode is more to protect what's connected to the coil (and probably what interrupted the current to the coil) such as a switching transistor or a set of contact points. The diode is connected across the coil and its polarity is such as to short out the spike. This always works out not to short the current away from the coil when current is flowing.\nMost motors and pumps being AC, a diode can't be used for such protection although the inductive kick can still occur. Surge suppressors are used instead.
983330
It acts as a conducter and also helps the probe slide all around.\nRachel
983000
A Gunn diode, also known as a transferred electron device (TED) is a form of diode used in high-frequency electronics. It is somewhat unusual in that it consists only of N-doped semiconductor material, whereas most diodes consist of both P and N-doped regions. In the Gunn diode, three regions exist: two of them are heavily N-doped on each terminal, with a thin layer of lightly doped material in between. When a voltage is applied to the device, the electrical gradient will be largest across the thin middle layer. Eventually, this layer starts to conduct, reducing the gradient across it, preventing further conduction. In practice, this means a Gunn diode has a region of negative differential resistance.\nIt is used a lot by radio amateur.
176162
Semi-conductor diodes have a non-linear and asymmetric current flow response to applied voltage. Basically they allow much greater current to flow in one direction over the other. It is based on some pretty heavy physics, but can be modeled by considering the junction between N type doped semiconductor and P type doped semiconductor where the majority carriers on one side are positive, and the majority carriers on the other are negative. When you bias the junction in a certain way the carriers on each side of the junction cancel each other out and you get very limited current flow. When you bias the diode the other way the carriers don’t cancel and you get much higher current flow for the same applied voltage.\n\nI assume you don't want to know about vacuum tube diodes of old. They are based on a very different physical property.\n\nHope this helps.
1040193
Try this link\nhttp://diode-lasers.globalspec.com/LearnMore/Optical_Components_Optics/Lasers/Diode_Lasers?se=gt
107063
Yes, a full-wave rectifier can be made with only four diodes. No transformer is required.