DIY Scanning Electron Microscope - Sources, Costs and References--- make money online

hey guys first off I want to give a big

thanks for all the subscriptions and

comments and views the project has

generated much more interest than I

would have imagined so it's really cool

to see people interested in this kind of

stuff second I saw a lot of comments

about back to the future in DeLorean so

I thought we'd take a little trip out to

the driveway Great Scott

this is my 1982 DeLorean which I've

owned for the past twelve years about

and I don't drive it every day I have a

Civic for that and I take this to car

shows about two or three shows a year so

this year I will be at West Coast dream

machines in Half Moon Bay and on a May

first alright well I hope you enjoyed

that now let's get down to business what

do you need to make a electron

microscope and how much is it going to

cost alright let's get started so here

is a really rough schematic of the

microscope I'm sorry for my poor drawing

ability but this is basically the

electron column over here so this is the

filament at the top the electron gun the

electrons proceeded down the column this

is where your sample would be and this

is the secondary detector so my goal

here is just to give you an idea of what

the main components are what their

approximate cost would be if you were to

buy them on eBay and telling you what I

paid for them I don't think would be all

that helpful because you know like I say

I've had a lot of this junk in my shop

for a long time and some of it was you

know found or donated or repaired or

whatever so I'll try to give you the

eBay cost for most of these so let's

start at the top the tungsten filament

is a relatively simple thing it's just a

piece of wire in fact my original plan

was to use tungsten wire and just bend

it into a filament shape and call it a

day

the problem with that is that you have

to

yo filaments burn out and you have to

make new filaments and if the size is a

little bit off it might take a long time

to realign so I opted and then the other

problem is you need some kind of an

insulator so you either custom machine

your own ceramic or whatever it gets

pretty complicated so what I opted to do

especially because I found these is just

by the filaments premade off eBay so

these are actual electron microscope

filaments and as you can see they come

in a pack because they do burn out

pretty often you know 40 hours of use or

something is not unreasonable and it

comes with this nice ceramic insulator

so I was able to design an electron gun

that would just accept this right away

and be really easy these are pretty

cheap I think I spent about $30 or

something for this whole box of

filaments so we'll start there

and like you say you there's absolutely

nothing wrong with with making your own

filaments you can just bend that stuff

into the shape and be all set let's put

down 30 bucks for the filament now you

need a power supply for the filament and

this you'll probably have to build

there's really no ready-made power

supply that's going to do what we want

what we need is DC it can't be AC I

originally built an AC power supply for

it and it didn't work so I had to

rectify it I don't know why we'll talk

about that later you basically have a

six volt like you know 115 to six volt

transformer so a low-voltage X former

and then you need some way of adjusting

the voltage I used to variac can be a

pretty small very accidents we're not

talking huge current and then you also

need an isolation transformer since

Variax do not isolate and the other side

of this filament is going to be

connected to high voltage so you can't

you can't go straight through you need

an isolation transformer I think the

parts cost was probably under a hundred

dollars we'll just put down a hundred to

be to be sure the next guy is the sort

of the main power supply for the

of the electrons and this is like a 0 to

10 kV would be a good supply DC it has

to be very tightly regulated it can't be

an unregulated power supply so like a

flyback with a capacitor on it's not

going to do it it actually needs to be

regulated again my power supply is more

or less found for for very low cost at a

flea market but there are good power

supplies on ebay in this range and they

aren't so bad so we'll put down 100

bucks for that and I'll talk about what

I used off eBay too and in just a minute

the condenser lens it's something you're

going to machine from parts and we're

not talking about machining or parts yet

this is just the block components so

moving on we have the scan plates the

deflection plates and you'll need a

raster generator to drive those this is

also something you'll probably have to

build I actually would have been really

happy to buy this and in the comments

we've been talking about doing a digital

version of this thing and instead of

using like an analog oscilloscope with

all this you can do it all digitally

with an FPGA or something and that is

actually a good idea I wouldn't mind

doing that but anyway for the raster

generator you know you need like a 400

volt supply inside here and some

transistors and stuff and I'll talk

about more that in the sources later why

don't we put down another 100 bucks for

the parts in there the focus power

supply this is also like 0 to 10 kV

we're going to put down 70 for that one

on eBay if you search for Spellman power

supply there's a negative 6 kV 2 + 10 kV

supply that no one seems to want to buy

because the part number is like a custom

part number they're available now or at

least last I checked there's at least

one or two still on eBay but luckily the

pin out and all the voltages are written

right on the side of the power supply

case so it's actually a little bit

cheaper than most other high voltage

regulated power supplies on eBay ok then

we have the photomultiplier itself this

is the one that I used it is a

hammamet's ooh

r60 94609 for I don't think there's any

more of these on eBay but there might be

I only paid about $35 for this which is

a little bit lower than the average but

not much you can go on eBay and find

photomultiplier tubes for 450 bucks so

we'll put down 50 for that and then you

need a power supply to drive it this I

did buy off eBay very recently and I

spent about a hundred dollars for that

it's a five two hundred volts to two

thousand volts or something like that

it's a rack-mounted power supply then

you need a power supply for the Faraday

cage on the secondary detector this can

be zero to a thousand volts also tightly

regulated DC I think I probably spent

about fifty on that for off of ebay then

you need a phosphor the accelerating

power supply this can be it doesn't have

to be adjustable this one can just be

ten kilovolts again I think I use one of

these Spellman's too so we'll put down

70 bucks for that then you need the

actual phosphor this is another part

that you really can't cheat on so I went

to an electron microscope supply house

and just bought the little phosphor disk

and I would show it to you but sadly I

ruined the thing in a very stupid way

but but it actually still works

surprisingly so those images that I

showed in my last video were made with

the broken phosphor disc anyway that was

I think that's about $90 the phosphor

now at the bottom of the microscope and

I haven't talked about this yet what

most microscopes have like a mechanical

stage that moves the specimen around so

I bought a couple of those off eBay

not really I haven't even hooked them up

yet you know you can move the scan

pattern around electronically but that

only goes so far so it's really nice er

to have a mechanical means as well so

put down 150 for the pair of stages you

don't you could build them yourself to

this there's nothing wrong with that

okay so now below this dotted line here

this is

like the vacuum system this is just the

electron microscope section so we're

talking vacuum down here you need some

kind of a chamber I honestly forget how

much I spent for that glass bell jar but

I wouldn't recommend glass anyway really

a metal column would be a much better

choice so I'm going to leave that one

blank because they who knows how much

that is but you do need a high vacuum

gauge and I used a penning gage um and I

spent about 175 on that I think a while

back I've had it for a long time and

then you need a high vacuum pump in my

case I used a diffusion pump which is

good because they're cheap and very

robust it's hard to kill those things

diffusion pump you know the one that I

used was a three-inch diffusion pump

which is you know pretty good size for

that chamber but it could be a little

bit bigger don't bother with the

two-inch diffusion pumps go for a for at

least three or four these are available

on eBay and like you say it just kind of

depends on the the atmosphere sometimes

you might get one for a hundred bucks

just other times not let's put down

let's put down 200 why not and then you

need a mechanical pump these are

actually much easier to find you can get

a mechanical pump that's meant for air

conditioning service that's that's great

so those are those are good pumps for

that so put down 200 get yourself a

brand new one for that and like I say

this this you know cost breakdown really

doesn't cover any of the like the parts

parts like the Teflon for these

insulators and the metal and the rods

and adjustment stuff these are just sort

of the big-ticket items that you really

can't get around and I got my you know

if you really want to shock just look

into the cost of some of these things

this is really cheap high vacuum grease

but the really high quality stuff is

like fifty dollars for like a one ounce

tube so I mean you know there's a lot of

crazy costs involved you don't have to

go overboard

so I guess I should add all these up for

you I guess I'll do that in

post-production because I want to do it

right now and in the next video I'll get

into more detail with each one of these

things and again bring up cost but this

is just to give you a really basic idea

and I'll also compile a list of sources

so that you can see where I got my

information to build this thing all

right well feel free to post any

questions you have thanks for watching

and I will see you next timeTop Paid Keyword :  earn cash online, google make money from home, earn money online without investment by clicking ads, free earn money website, online money making jobs, earn money online without investment by typing, online work for money, best online earning sites, make money online with google, online earning websites, money making websites, online earning websites for students, invest online and earn money, best online money making, online money income, view ads and earn money without investment, earn money online by clicking, online money income site, money earning sites, online earning sites, best website to earn money,