Series Winding Symbol
Madelyn Westfall
Wingdings is a series of dingbat fonts that render letters as a variety of symbols. They were originally developed in 1990 by Microsoft by combining glyphs from Lucida Icons, Arrows, and Stars licensed from Charles Bigelow and Kris Holmes.[1] Certain versions of the font's copyright string include attribution to Type Solutions, Inc., the maker of a tool used to hint the font.
Wingdings is a TrueType dingbat font included in all versions of Microsoft Windows from version 3.1[4] until Windows Vista/Server 2008, and also in a number of application packages of that era.[5]
The Wingdings trademark is owned by Microsoft,[4] and the design and glyph order was awarded U.S. Design Patent D341848 in 1993.[6] The patent expired in 2005. In many other countries, a Design Patent would be called a registered design. It is registration of a design to deter imitation, rather than a claim of a novel invention.
This font contains many largely recognized shapes and gestures as well as some recognized world symbols, such as the Star of David, the symbols of the zodiac, index or manicule signs, hand gestures, and obscure ampersands.
Wingdings 2 is a TrueType font distributed with a variety of Microsoft applications, including Microsoft Office up to version 2010.[5] The font was developed in 1990 by Type Solutions, Inc. The current copyright holder is Microsoft Corporation. Among the features of Wingdings 2 are 16 forms of the index, Enclosed Alphanumerics from 0 to 10, multiple forms of ampersand and interrobang, several geometric shapes and an asterism.
The font was originally developed in 1990 by Type Solutions, Inc. Currently,[when?] the copyright holder is Microsoft Corporation. Wingdings 3 consists almost entirely of arrow variations and includes many symbols for keytops as defined in ISO/IEC 9995-7.
In 1992, only days after the release of Windows 3.1, it was discovered that "NYC" (New York City) in Wingdings was rendered as a skull and crossbones symbol, Star of David, and thumbs up gesture. This was often said to be an antisemitic message referencing New York's large Jewish community.[7] Microsoft strongly denied this was intentional, and insisted that the final arrangement of the glyphs in the font was largely random. "NYC" in the later-released Webdings font was intentionally rendered as eye, heart, and city skyline, referring to the I Love New York logo.[8]
After September 11, 2001, an email was circulated claiming that "Q33 NY", which it claims is the flight number of the first plane to hit the Twin Towers, in Wingdings would bring up a character sequence of a plane flying into two rectangular paper sheet icons which may be interpreted as skyscrapers, followed by the skull and crossbones symbol and the Star of David.[7] This is a hoax; the flight numbers of the airplanes that hit the towers were AA11 and UA175; the tail numbers were N334AA and N612UA.[9]
OK after posting I decided to launch KiCad and have a look. There are only a couple of symbols which represent transformers which I hand wound on PQ20/20 cores and bobbins. I guess it is unlikely that you can use exactly those, but they are examples and may provide some starting material. I think I copied the basic looping transformer shape from something in the standard KiCad symbol library. I also have at least one PQ20/20 footprint which I can post if you need it.
Block the 3 windings in turn and move to approximately the required position.
Make some arcs (in green box) using the arc tool (red arrow) and move them to the required places, or make them in place.
Move the pins to the places you wish.
Add some short lines using line tool (red arrow) to join arcs to pins.
I once gave advice to someone that got it screwed up pretty bad. Even if I HAD told him to short out the light bulb, the maintenance manager of a complex of several lake side, high rise apartment buildings should have known not to do that. That was a valuable lesson to me on giving advice.
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Combinations of these five symbols can be used to completely describe the voltage ratings of a transformer. These symbols were adopted by manufacturers because it would otherwise require a lengthy description.
The number of bushings (insulators) brought out can influence the variety of connections possible. For instance, a 120 x 240-Volt transformer might have only two low-voltage bushings while a 240/120-Volt unit would have three. A 120/240-Volt unit might have three or four. Also, some high-voltage windings are insulated throughout for the full line voltage: these can be connected in either wye or delta. A winding with one high-voltage bushing and one low-voltage bushing must be operated with the low-voltage terminal connected to a solid ground. These single-phase transformers usually are identified by the letter \"G\" in their description. For instance, a distribution transformer with three low-voltage bushings for use on a three-wire, 240/120-V residential service and a 7,200-V primary winding with only one side insulated for the full line voltage would be described in this way:
I had been using this 24 volt power supply I pulled from a laser printer, many years ago. I heard a "POOF" one day when I was experimenting. Opened it up and found a fractured ceramic resistor. It was a weird shape, I didn't recognize - so I ordered 10 of the same watt rating (5 watt), 2-ohm - no big deal, at $1.50 for 10 (with delivery cost), I might actually find a use for the other 9 at some other time.
Low value resistors are often wire-wound around a ceramic former or core. If the wire is wound in a continuos direction the result is both resistive and inductive, which will have an effect in high frequency circuits.
To create a non-inductive wire-wound resistor, half of the resistance windings are wound in one direction (say clockwise) then the wire is folded back on itself and the rest is then wound in the opposite direction (say anti-clockwise) These two windings are inductive but the two inductances so created "cancel" each other out (from an inductance viewpoint) whilst the resistance is the value determined by the full length of wire.
DocStein99:
I had been using this 24 volt power supply I pulled from a laser printer, many years ago. I heard a "POOF" one day when I was experimenting. Opened it up and found a fractured ceramic resistor. It was a weird shape, I didn't recognize - so I ordered 10 of the same watt rating (5 watt), 2-ohm - no big deal, at $1.50 for 10 (with delivery cost), I might actually find a use for the other 9 at some other time.
As others have been saying, the resistor is made so that it has very little inductance but still has the right resistance. That means it is wound a different way. In the circuit it helps when there is a high frequency or fast rise and fall signal. It has low inductance so it does not react as badly as a regular wire wound resistor would. In some cases it is very important to have one, in other cases it doesnt matter. It's usually a matter of frequency.
The label on the broke resistor is "MPC75", I found a document that explains, low inductance. Inside this gizmo are bands in a zig-zag from left to right, soldered at the top and the bottom. Interesting.
Mine marks "2.2 OK" (where "O" is the OHM symbol). I thought it was 2.2k ohm? Confused. This document claims it's available in "2,20 ohm" (I assume the comma means decimal). They offer other values, .01 .05 .08 - but nothing in 2.2k range. I do not know why there is a "K" stamped on my broken resistor or what that should mean since this manufacturer doesn't seem to supply 2,200 ohm low inductance 5w resistors.
Thanks for the information. These resistors are rare, and they only make certain ohm ratings. Well, I'll just go buy another junk HP laserjet 4 from another flea market and have all the rest of the goodies with the power supply. The resistor is just too expensive.
Yes. That's the same one I've been looking at. I was surprised to find it was actually easy to look up. I knew it was a resistor, and ordered 2.2 ohm 5w resistors - after reading only the chart section of the datasheet. Ironically, just a few days (without looking for it, just stumbled on it while searching for something else) I found "non inducting resistor" with a picture of the same one I broke.
In the top one, the wire is wound in one direction, does a u-turn, and is rewound in the new direction. A practical construction will probably have several u turns to make sure the direction changes are evenly distributed throughout the entire winding.
Electrically, the two windings act like a 1:1 transformer with the primary and secondary winding in series and oriented so the voltages they produce is inverted. +1V from one winding is exactly cancelled by -1V in the second coil, so the net effect of the inductance of the "two windings" is 0.
Then it's not wirewound and will inherently have pretty low inductance. Thos construction techniques are really only applicable to wire-wound ones. Like the name implies, those kind of restors are constructed by just wrapping a certain amount of wire around a spindle and encasing it in a protective material like cement. The wrapping naturally forms a coil, and if you don't wrap it the right way there will be significant parasitic inductance.
Hi. The 'K' is most probably the tolerance of the resistor. Off the top of my head the characters J, K, L and M represent tolerance values of 2%, 5%, 10% and 20% respectively. If the K was to represent thousands as you suspect, the value would probably have been written 2K2O (again where O stands for the ohm symbol). So you have a 2.2 ohm 5% tolerance reistor. Another variation is to use 'R' instead of the d.p. to signify ohms - as in 2R2.
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