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Can someone explain thes to me? Answered

I'v been studing electronics for a long time and ran acrost this at a web site this morning.  What are tubes?  Ive seen transistors and thought they were the betinning.  What are tubes and what are all the other symbols on the diagram.

Can someone explain all of them (the simbols)  to me and what there purpose is?  Hurry ive only got about a month left of my vacaton and the its back to shool.

Some day when I get the the noble piece prise for knowledge I'll include you all in my accpteance speach.

PS  I've posted the skematic that didn't post before.


Can you share the noble piece prize for knowledge; I've always wanted one.

This is really OLD technology, think 8 track tapes or vinyl records. I seriously doubt you will be able to find the working components to make this. And why bother? Knowledge is only as good as its usefulness. Your time would be much better spent investigating current technology. Perhaps you can find a project that does the same thing as this one, but uses components readily available. This will look better on your college resume and make you more employable.

Im not going to college. why should i waist time there wh\en I could be doing things now.

The point is you can learn to do things now... build circuits and projects that will perform the same functions as this older technology with readily available components, and come away with usable knowledge that will provide you with future opportunities to things like college, internships and competitions. (btw-'waist' is what you put a belt around, I believe you mean 'waste')

can I get a higher-res version of that picture or the link where you got it in the first place. I might want to build one of these.

heres a link. I don't know how to make it highlight like some of them do. but you can see how small it is in the pictures. So it should be easy to make fit in a watch case. http://www.dogstar.dantimax.dk/theremin/bamtrat.htm


7 years ago

If you have been studying electronics for a long time and you don't know what a tube is, more specifically, a vacuum tube, I'd say your course curriculum has missed some very important steps.
Google "Beginning electronics" and start there.

I've uploaded the diagram. the diagrame didn't upload the first time I tried. can you or somebody else explaine all the partos of the diagram and why they do and why they are there. Which parts can I leave out. I want to build this device this weekend and woon't be able to get all ov the parts in time. It seem like a lot of parts to run on just 1,5 volt battery. Could this run on like a watch battery so I could make it fit in like a watch case so I could wear it on my arm. I't would be like a tube ipod?

LOL. Unless you're the Green Giant, you will not be able to fit this on your arm! Seriously though, this is an AM radio. Like, a full-size tabletop AM radio, like you'd see in an antiques shop. I don't think this is what you're looking for...

Here's the tube theory in a paragraph. Tubes have no air inside, just like an old fashoned light bulb. They have a filiament that glows like a lightbulb also. When the filiament is glowing... electrons are emitted out of the special metal surface of the filiament. The electrons would just spatter like GREASE in a frying pan... but nearby is another metal plate that is POSITIVELY charged. So the (negative) electrons are attracted to that grid. So far this is a DIODE type tube. Now if a CONTROL grid was placed in BETWEEN the filiament and the plate... and it was charged NEGATIVE... it would reduce the amount of electrons flowing to the positive plate. This control grid has holes in it sort of like a window screen. All of this happens at hundreds of volts so it is nothing to fool with for an amateur. That is basically how tubes work... but some tubes have TWO tubes in one... some have multiple control grids...etc etc so it gets more complex. It is better to stick with transistors. they are easier to start with, then if tubes still interest you... you can move on to those.

That's not a diy diagram. There are a lot of things missing like the high voltage power supply. Vacuum tube radios almost always have a power supply of 200-400 volts and this is not something that should be attempted by a beginner. Don't try it unless you have some experience building things that run on 120 volts ac.

I agree with burf, you should google "electronic tutorial" since there seems to be gaps in your training.