Everybody you know I've had a couple of students that have been searching for parts and having a little

bit of trouble.

Now even though during the lectures we go over you know looking for parts Digi-Key Mouser Amazon ate

a fruit Sparke find looking at their prices and how to search for them.

But that information of course is in the lecture.

So as you watch the course you're going to see those lectures and learn how to best find parts and get

them for a good price.

However those of you that are kind of skipping around and maybe trying to do stuff you might get into

a situation where you're spending too much money or whatever so I just want to take a couple of minutes

and show you.

So this is a it's a bonus lecture but it's not really a bonus lecture this is just a quick little anecdotal

piece of information so that people aren't wasting time and money.

So one customer was looking for like capacitor's Another one was looking for Ltd's And so you know the

first thing is let's start with Digi-Key.

So there's Digi-Key in malls are those are the two sites I recommend use as a search engine.

Now depending on what region you live in you may have to use a newer core element 14 or an other local

distributor but you can mousers ship worldwide number one so you can always use of if you want anyway.

So let's say that we wanted to find like a 0.1 micro for ceramic capacitor.

Right.

And we just say cap so we type you know something roughly like what we're looking for in the search

engine.

Now the thing about the search engine is you have to be careful if you get real narrow sometimes you

won't get anything.

And you'll think that it's not in the search engine so you got to be real loose with these search terms.

And then also the order that you change the search for amateurs makes a difference in this.

All right so we see there's sporadic Vasser is eleven thousand seven hundred eighty devices.

All right that's all we want.

Now when you get to the screen here you see it says more filters and we can get more stuff down here

if we won or over here we can cease scrolling.

And I'm kind of a I'd like it to be scrolling.

All right so now I just want there are lots of capacitors in again.

This is what the Course is about.

There's 140 lectures that explain all this stuff right so not could explain in five minutes.

But if we're just looking for you know real basic point one microflora add capacity or we're going to

say in-stock I want to Rojas compliant.

I want it.

Obviously the part to be active let's say we want to cut tape.

All right.

Now what kind of voltage rating Do we want when we're talking about small capacitors.

Typically I went like 25 volts or more.

So I'm going to say 25 and I'll just say up to 2000.

All right.

We'll apply filters and apply air filters really slow when you're looking for things.

Don't set up too many filters at once.

So the order that you do things is really weird with a lot of the search engines say you had three filters

if you do all three at the same time nothing comes up but if you do the first one then you do the second

one.

Then you do the third one.

Then all of a sudden things come up so you got to be real careful with order.

All right so you've got all these different voltage ratings and we can scroll over here and we want

let's just say we through hole.

All right.

So we'll do that.

That'll get rid of all these surface mount packages then we can say automotive for general purpose just

leave that alone.

All right then we can say axial or radial.

All right.

So we'll see axial.

All right and then excuse me I wanted radial I can clear that.

Where is that package case go there and if and get this back.

That's not what I wanted to do.

So you have to click to the right of it of the selection I think.

Let me do that and be clear that let me put radial OK.

All right so here we go.

Now what I do and I've got some parts here.

How many do I have a hundred and seven.

All right right now again.

There's all these different things there's the temperature goldfish and all these ratings the size all

is I don't really care.

First thing I want to do is just search sort on the price just get the prices down.

All right so now it looks like these things are maybe 20 20 20 20.

They're all about 23 cents 24 cents so they're gone up pretty big jump right now.

Now is talk about temperature coefficient we're going to talk about this in detail in the course of

I'm going to go over it here.

But what I can tell you is this is temperature temperature coefficient.

This x 7 and R has to do with the lowest temperature the highest temperature and then the tolerance

in a percentage.

So you can look this up so you can go to a table and look up capacitor temperature tolerance.

So you can see a capacitor

capacitor temperature coefficients.

Right.

And here we go right here.

And this is just some random thoughts make it a little bit vague here.

And it's actually on Digi-Key site.

OK so now we look down here so there's that X Y and Z C C here we see X here is a Y.

Here is an X and X we go far enough.

We might there is a Z.

Right.

So that's what the first letter is.

So the first letter means it's good to minus 55 or minus 30 or only plus 10.

So typically we want things with the minus 55 or the X Y will do.

But start with x That's pretty good.

Then the next number is the higher range right.

So the next number is what the high ranges.

So typically we like five or seven five six or seven kind of gets it done.

Ideally seven.

So now you've got X and 7.

And then we want to know the changing of Passhe capacitance over the temperature range this tolerance.

So you can see there's p r s t u v and then V is horrid 22 to minus 82 percent that's just terrible.

So what we want is r in S.

Those are kind of realistic.

So what we want is X or Y.

Five six or seven are or.

So like x 7 are would be great x 5 are would be great x 7 s would be OK right.

It's a little bit worse but that's where we want to be so we are in the US is where we want to be.

And the 5 6 and 7 is where we want to be and the X and the Y is where we want to be we never want to

be at zero is just terrible.

OK.

Useless.

All right.

Now that you know that.

So up here we see we've got this ex-Gov which is good.

This is a 10 percent solution.

Take everything x 7 Arliss is only Mesereau x 7 are right.

And where can I find that right here.

Here it is right here.

All right so it is to take seven or good enough.

All right.

And then there's even more accurate capacitors called Karger MPO which we're not going to play with

right now.

OK so now we have a lot of these different choices.

So now at this point I want to see well there are 23 cents in quantity what am I going to buy one I'm

going to buy 100 of them probably or 10 of them at least.

So here's Vishay Here's avi x' shaving shave ADX.

So let's just look at the Schey and ADX.

X right.

So if you go here to the Schey we see it 100 it's eight cents.

That's pretty cheap sort of hundreds eight cents.

And then we go here to the AB ex-parte where are you.

And then at a hundred it's seven cents.

All right.

And then we look at the width.

Right.

So we look at this pin with right here the spacing and you can see it's about the height and the size

and there's a lead spacing five millimeters right so that's five millimeters on that one.

And then on this one I believe it's five millimeters as well or eight.

And where would it go.

Five millimeters as well.

OK.

So these are almost identical so now really at this point it's just taste right.

You know what company do you like better.

So if we look at the specs are almost identical.

Right.

Maybe their sizes are a little bit different so if you look this one is a little bit smaller.

All right little bit smaller than the other one.

So maybe you're going to go with this right here so let's just go with this.

So we go this way we look at the price and say hey I want to use these a lot.

So here's the thing.

If you buy 10 of them you're going to pay $2 at 30 cents if you buy a hundred of them bright yearly

and pay eight or nine bucks been by the hundred because this is one of the most common values 0.1 microfracture

platelet micro ferret it's good 50 volts x 7 are that's why I'm at a buy.

All right.

Now let's say that you want to get a bunch of different say electrolytic capacitors or electrolytic.

Now electrolytic can be fairly expensive.

Right.

So now I could buy them on here and I could search for them.

So it's if you want to find 100 microflora at electrolytic.

All right capacitor that should be enough to find a good.

All right so we go on here.

Kate great limit of lecture electrolytic capacitors.

Sixty eight hundred of them.

Kagan let's start slow.

Active 100 micro Feraud bulk or cut tape sometimes or loose in a bag and want to stock.

I always like everything Rojas compliant.

All right.

Now there's even more things to deal with with this right.

But again let's just see what's coming up here.

All right.

So we're getting the surface mount guy.

So let's at least get rid of that that I know I don't want.

Right.

So going to go over here we're going to find packaging packaging packaging packaging someplace.

Here it is.

And we went through whole.

Now let's apply that filter.

Okay now is eleven hundred of them and now they're all through hole.

OK great.

Now let's go and sort by price OK.

So now look we've got some really cheap devices here at 12 cents for one so that's really good with

electronics.

Excellent.

But now look at our voltage rating so let's say that we want to use this hundred micro ferrett capacitor

in a power supply.

Let's say we want to use it right where the power came in and say we were regulating the power or you

know at least turning it to DC from say nine or 12 volt power supply that nine or 12 volts could sit

at maybe 12 to 16 volts with no load on it.

So at least 16 volts says 10 Bush is not going to get it done.

So what we really want is 16 and up.

All right so let's just say 16 to 50 volts that'll get it done.

Now we do that and we come back through here and again now OK there are 16 25 35 and then we see the

price hasn't really changed much here.

So I like this 25 cents at 20 percent.

All right.

That's polarized general purpose.

We look at the leads facing here.

Radio can and whereas earlier speccing 2.5 millimeters very small.

And then another.

Another thing is lifetime 2000 hours at 105.

So if you cook it at last 2000 hours these things ripple current I talk about these and of course I

want to talk about this right now.

Let's see is there anything else I want to talk about.

Not really.

And the tolerance of these are always going to be about 20 percent for a good one.

And as they get bad you'll see like 30 40 50 you don't want anything like that.

So it looks like I can find a capacitor that has a 25 oil rating hundred microflora.

That's a pretty big pastor for 14 cents and now at a hundred it's only 10 cents.

So there we go I'm going to buy.

I want to buy but you know maybe a hundred of those or maybe I'll buy 50 those for $10.

But what if I want like 20 different values maybe I want 10 microflora and I want 47 I want 22 I want

a hundred I want to 21:4 70 I want a thousand I want a bunch of different values.

This could get kind of expensive maybe I'd spend like 50 or 60 or 70 bucks.

So another thing you can do is get kids.

Now you can look for kits on here but let's just go to Amazon and and Amazon.

We're going to say say resistor Let's start with a resistor kit.

OK.

And we really want to through a whole resistor kit.

So we'll see what comes up and what's coming up with the through hole ones are so great we'll just stick

with that.

And then we look here and I'll just sort it on prime because I want everything to be sent for free.

All right so this right here it's got 17 different value 1 percent 0 to 1 megohm and 103 positive reviews

that looks pretty good.

Looks like this is the same.

Is there something that has even more 134.

So this has got 134 values what do we have here.

Seventeen values 134 values 25 pieces each.

So 0 to 4.7 megohm one fourth watt metal film resistors so I really like this one right.

This is more what I'm looking for.

So here's a nice kit.

And then here will be the there's all the value so 0 1 2 there's a lot of values in there and I can

see it's all the way up to 4.7.

You've got 25 of each and they're all one percent.

These are really really good resistors and they're one quarter watt so I've done so right here for $17

I've got all my resistors that I'll ever probably need as I'm prototyping.

I would just get that be done with it.

All right.

The capacitor kit

if I can spell my hands are free.

So it's like 40 50 degrees here.

Even though I'm in my lab and it's hot it's warm.

You know I just went outside for something and it's like your hands are just the heat is taken out of

course.

Now some people live in Russia for example I think you know let's say 40 degrees Fahrenheit is like

they could go swimming in it.

All right capacitor kit.

OK so capacitor kit again.

Now we want that electrolytic we've got tantalum we've got ceramics so you know again we could drill

this down a little bit but let's see what kind of comes up here so ceramic.

So let's just get a capacitor made of say ceramics or right a capacitor of a ceramic capacitor kit and

ceramic capacitors are going to be really good.

They're more precise they're more stable they're better for filters and amplifiers all that kind of

stuff you're electrolytic are going to be for smoothing in bulk capacitors I typically don't use them

for anything other than those applications.

But it's hard to get a 100 or 200 1000 micro ferrite ceramic capacitor would be very very very expensive.

So anyway let's take a look here.

And let's see one hundred nano Feraud 10 micro affair and not enough not enough values is only what

$10 a user.

I don't like that.

Here's 15 values 550 pieces from point one to 10 this this 15 doesn't look too bad.

See 30 values from 10 puft to 10 microflora.

That's not bad.

And let's see.

Set of 600 from there.

OK.

So maybe you know maybe I'm looking at this or right here right.

And I might have to get a couple a couple of different kits.

Right.

And if you look at these these are not bad.

They've got good long leads long enough to get to your silos breadboard and then of course says what

the values are here.

Ten puff.

Thirty three thirty point forty seven nano affair.

And so on and so forth.

And then up here we've got our one microflora.

They're just they're kind of out of order here 10 microfracture anyway so maybe you're going to get

that one and then maybe you look at you know this one and see what the values here are.

So these are higher voltage so these can withstand Heibel just we don't need these.

Right.

These are high voltage three killable ceramic fasteners you don't need these.

All right.

So I'm able to get that ceramic kit for our smaller stuff.

Now we want some bigger value capacitor so then we go electrolytic electrolytic capacitor kit.

All right.

So because we want some bigger capacitors and we go here we get 15 values.

Now here's a 24 has a 25 value on like in that better 24.

And again I'm just looking at this for a few seconds so you guys can do a lot better.

13 values.

OK let's go back up here.

And I think I like this 24 500 and this one has one two three.

This has got 24 also is at 25.

It's just kind of showing it here is a 24 right here.

This looks pretty nice too.

All right.

I'll go here and hover Yes we can see point 1.2 to you know all these good values here 10 micro-grid

hundred microflora.

So this is a great kit right here up to 1000 Mike referred right there.

So I'm pretty happy with that.

And then you can take a look and grab some of the voltages off here so I can see for example I can see

there's a 50 volt right there.

So these are all pretty good voltages also.

So they're going to be useful.

So maybe you have to get that kit as well.

Right.

So this kit is what $17.

So I got a couple capacitor kits that get a resistor kit I'm done.

I don't need to go buying things one by one off of Digi-Key.

Now the other thing to remember is when you're designing and doing electrical engineer there's a reason

and again you won't know this unless you take the class but we use these common values 100 ohm 220 ohms

330 ohm one came 10 Cail.

The reason why is because those are just made in bulk in mass sense I don't know probably the 50s electrical

engineers use those common values so these kits are always going out of those values.

So if you don't use a 220 ohm and use a 207 ohm resistor for some bizarre reason you're not going to

be able to find it unless you buy it specifically.

But if you just kind of say 220 you get it done that way you can use common parts.

And that way you can kind of buy things that are in kits.

Save yourself a lot of money.

All right.

So anyway I just want to show you that nobody should be spending a lot of money.

This stuff is really really really really cheap.

You just have to know how to shop.

All right.

And so I suggest that you know at whatever country you're in if you don't have Amazon use your version

of Amazon whatever that may be.

Ali Baba made in China whatever.

And if you can get to digitally Digi-Key and Mouser they're great for searching and of course for purchasing.

And of course for your ice season all that you're going to need to educate your Mouser at sea.

Is there anything else I think that was about.

Yes.

So I just want to make sure people aren't having trouble with that.

Right.

So anyway a real bonus lecture will be coming in a while but this is just to help people out that are

you know trying to shop early and get some parts to build some stuff.

Right.

So see in the next lecture by.