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Identify a Signet Ring? Answered

My grandmother gave me a signet ring a week ago, and I was wondering if anyone could help me identify the coat of arms on the front of the ring. I don't know what metal it is made from, and there is no visible hallmark that I can see...

Question by ObsidianBlush    |  last reply


Please help me identify this Silver signet ring

Found it stashed away in my grandpa's house after he passed, he was a polish immigrant, so it might be from there

Topic by lauracz62    |  last reply


silver casting mould

Anyone help me here..I have a wax master of a signet ring. If i use lost wax casting i will lose my original....This i do not want. Is there a mould making stuff that i can press the ring into leaving a negative to fill with silver.....

Topic by maninamousesuit    |  last reply


Mating gold plated jewely and brass?

I'm working on a simple little design for a present where I have this cheap gold plated signet ring and I'm going to be taking a small portion of those spiral shavings from a piece of brass stock and creating an Archimedean spiral pattern which needs to mate with the face of the ring. The inner metal of the ring is unknown, and due to the thinness of both materials welding seems out of the question. How should I mate these two objects together?

Question by SkylerS12    |  last reply


[Help question] Funai W4D-D4180DB of "ATX Power Supply" convert

Now I can be understand about a DVD Players (+12V) anyway -> youtube.com/watch?v=dtRIzy2j2xs (Not my Clip,Just I watched this.) ----- But I had a problem about a Addition (or maybe not) but I will be had of a Motherboard detail question about a Volts: +44V +16V When how are be possible to start without a "+44V" problems of a ATX's pins...? ----- When I do be had a Good think that will be (maybe,but I doesn't be had a sure) possible of a 34-to-20pin convert because that's can be work. (Stock power supply of Combo Recorder are be a 35W of 230V) - but maybe Connects are be questionable anyway... ---- In Photos: 1. "PSU" write signet detail of Motherboard for Help respond' 2. Motherboard (If you want of a Volts Detail, then I will be can a upload addition photos)

Topic by Illutorium    |  last reply


Easy automated method to find chronological age of an integrated circuit design? Answered

This is not a question related to a homework or career assignment. This question is an existential question. Specifically, the thing that I am wondering if it exists, or not, is an easy and automated method for finding the chronological date, e.g. a year, Anno Domini (AD) or Common Era (CE), when a named integrated circuit (IC) was introduced.  Preferably this method exists in the form of a free resource on the Web. As an example, the well known 555 timer IC was introduced in the year 1971, and I am reasonably confident that was the year, because the Wikipedia article titled "555 timer IC", https://en.wikipedia.org/wiki/555_timer_IC contains the words: "Introduced in 1971 by American company Signetics, the 555 is still in widespread use..." And I assume that statement is totally true, because if I can't trust the people who edit Wikipedia, I mean, who can I trust? ;-) Unfortunately, Wikipedia does not have a fact-filled article for almost every IC every sold.  In contrast, a place like www.alldatasheet.com has data sheets for almost every IC ever sold, but, it turns out, the data sheet does not always reveal the year the IC was introduced. To clarify this further, the thing I really want to exist, would be like a web site, with a name like: www.howoldismyic.com, or www.howoldisthisic.com, or www.icdob.com etc. (Please note that none of those URLs point to actual existing web sites, at the time of this writing.) Moreover, I am fantasizing this web site would contain a form, for to enter the name of the IC to look up, and then after hitting the "Submit" button, it would magically tell me what year that IC was introduced to the world, and maybe also which semiconductor company gave birth to it. As some example input and output, the query NE555 would return:  NE555, 1971, Signetics(r) As an additional twist to this fantasy, the query, LM555, would return the same thing, and this magical web page would like, know, that LM555 was a later version of the same IC, except produced by a different manufacturer, namely National(r); i.e LM555 was National's version of the 555 timer . If you have read this far, I congratulate you!  And I appreciate your eyeball time! If you are wondering about my motivation for this question, it is just that think the year an IC was introduced would be a very useful metric, like for answering more specific questions, like: The SG3524 and LTC3780 are ICs used for making switchmode power supplies.  Which of these ICs is more modern? I.e which IC was introduced latest? It turns out, the answer to this question is: The SG3524 is older (introduced first).  The LTC3780 is younger (introduced second). The SG3524 was introduced (I am guessing) in 1977, and that guess is based on some cryptic scribbles in a data sheet for the SG3524, published by Texas Instruments(r). The exact characters were: "SLVS077D – APRIL 1977 – REVISED FEBRUARY 2003" and I am just naively interpreting that blurb to mean the SG3524 was introduced in 1977. Regarding the LTC3780, I think it was introduced some time in the 1990s.  Looking at its datasheet, from Linear Technology(r), I could not find an obvious description of what year it was first introduced, but the first page mentions some US Patent numbers, and looking up those patent numbers, gives dates circa the early 1990s. So the LTC3780 is the younger than the SG3524. However to find that answer, I kind of had to do a bunch of reading of datasheets, and US Patent numbers, and that method took a little bit of work. My question:  Is there an easier way to find out how old (or young) an IC is?  More specifically is there an existing resource on the Web, like a free database, or a IC history site, or something where I can essentially "look up" the year an IC was introduced. By the way there is no absolutely zero urgency attached to this question.  So please answer if you feel like it,  and don't if you don't. I thank you for reading this.  My name is Jack A Lopez, and I approve of this message.

Question by Jack A Lopez    |  last reply