Part numbers

No.

OK I felt bad just saying "No". The part numbers are only significant to the manufactures of the part. There are some exceptions for US Military numbers but generally the numbers will only help if you know the manufacturer and can access their number system.

Tom

Each maker uses their own system. No one documents them.

Two totally different parts can have the same number.

Two identical parts can have the different numbers.

Hi, JEB. You might want to give more information about exactly what you're looking for.

Trasnformers, no common numbers. You generally have to check with the manufacturer's information to see what it is and does.

Resistors, caps, inductors -- no. Manufacturers have their part numbers, but it comes down to value and wattage for resistors, value, voltage and type for caps, and so on.

Diodes and transistors -- some of the time. There are JEDEC numbers (! N and 2N), which are supposed to correspond to a standard.

ICs -- not really, but they can be second sourced.

If you want to identify a part, you might want to be a little more specific.

Goodd luck Chris

--
Generally, part numbers for "transformers and such" are manufacturer
specific, but sometimes you can luck out by searching for the part
number on Google, which might get you to a catalog page or a data
sheet.

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Thanks gentlemen, I am just starting with this hobby and am wanting to be somewhat self sufficiant. All of your comments have been helpful! P.S. while I'm sucking up... 40C20 FMC 7841 mean anything to anyone? I think its an scr but not sure. Theres a picture on page 59 (high current) In Forrest Mims Getting started in Electronics . Where can I find these?

If you are looking at transformers salvaged from commercial equipment, they are probably custom parts, and the transformer manufacturer won't give you any information on them.

--
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When I scrap stuff, the transformers tend to be one of the potentially useful parts, because they can be costly to buy. So if I'm stripping something (either that I'd bought, or found), I'll take a marker and mark what it came out of, and sometimes even which is the primary winding (though the color coding for that is usually consistent).

This doesn't say much about capacity, but it gives a general idea of what it might be useful for. A tiny accessory certainly won't have the current of a bigger piece of equipment.

Of course, transformers are easy, since you can hook them up to the AC line and measure the voltage. Current capacity won't be clear, but the size can help in making a guess.

It can be great pulling a transformer out of a clock radio or something to power some tiny bit of equipment, since otherwise buying a transformer might cost more than the rest of the parts, and thus it won't be as handy when you decide not to put a transformer in there.

Michael