Beginner Electronics - 14 - Circuit Design, Build, and Measuring!

[@CodeNMore]

**DISCLAIMER - READ BEFORE WATCHING** I am an electronics hobbyist; I do not have a degree in electrical engineering. This series MAY NOT teach all of the appropriate safety required for general electronics work. Any advice taken from this series should be checked with multiple sources, and a professional should be addressed to ensure proper safety. As a general precaution that was not pressed in this video in particular: power should be DISCONNECTED when working with electronics components. This is a major safety concern.

[@tyronemixx]

NEW HOBBYISTS: DO NOT MAKE CIRCUIT CHANGES WHILE POWER IS CONNECTED TO THE BREADBOARD. I understand it’s rather late for making comments but I’ll add mine anyway. It’s been more than 45 years since I dabbled with circuits in high school. What jumped out at me was that you were grabbing components (the LED lead) while power was applied to the circuit. Yes these are extremely low currents but I think for safety reasons , New people should be taught safety practices so it is ingrained in them. Thanks

[@MistyyyYT]

Tyrone Mixx I got ya

[@limahkou3446]

@ Tyrone Mixx There are many factors in learning electronics. One plan I discovered which successfully combines these is the Gregs Electro Blog (check it out on google) definately the no.1 info that I have ever heard of. Check out this interesting website.

[@roboking1020]

Gotta admit that I wasn't even thinking about that. Thanks a bunch m8. Safety should always come first.

[@danielgonzales5923]

Not certain about the points made but ,if anyone else wants to discover introduction to electronics try Bablim Electronics Booster (Have a quick look on google cant remember the place now ) ? Ive heard some interesting things about it and my partner got great results with it.

[@VSHEGDE1947]

Idk why but your playlist of "trains interesting" cracked me up

[@TheSummersProject]

Hello there, Im 40 years old and found a new hobby thanks to you.!. Great videos buddy, thanks is there any more videos on this subject.?

[@CodeNMore]

+Alexander Summers this series is currently ongoing, and will be continued, don't worry!

[@TheSummersProject]

good man, thanks for your reply. looking forward to them.

[@supunkumar]

+Alexander Summers the greatest results that i've had was with the Gregs Electro Blog (just google it) definately the best course i've followed.

[@Labyrnthdom]

Alexander Summers I'm 46

[@dcjunkieful]

same, i'm 24 though and if you buy the kits, from all the tutorials he's taught, you can do just damn near all of the the other projects in the booklet that you get with the starter kits

[@g.i.gproductions2602]

This playlist is fantastic. I have bought my own kit and I am trying out some of these experiments and I am getting successful results. Please post more of these.

[@supernintendochalmers-wj8rz]

Very informative. This covered everything I learned in a basic electronics class in college.

[@avrumisolaimani8546]

supernintendochalmers1234 lol i haven’t learned a thing in science class as of 2018 kinda doubt that’ll change anytime soon xD

[@zandramastrisagion5002]

You explain everything very clearly and effectively. I am thoroughly enjoying your episodes!

[@Aaron.Garner]

It's a shame these videos are getting hit by some shady ads for that greg blog thing that costs like $40.

[@mammakujo8987]

So far you have done a superb job of instructing and reinforcing the information. I am really enjoying the information and learning from your series.

[@tikrasseo]

More, please! You're an awesome tutor! Thank you for all the effort you've put into these videos!

[@BrianMeyers-yl3om]

I was thrown into the field at my job on day one without any idea what i was doing or why. following this it very quickly answering the why lol. thanks. I got up to this video today, plan on starting again tomorrow. Going to return to work Monday with a lot more know how in what I am doing, i appreciate you making these videos. i'll be sure to pass on to co workers with the same problems. makes me and im sure a lot of other people wonder how places can hire people and just think they will pick it up as they go without any mistakes. But i have no problem working overtime fixing the mistakes i made cause they didnt teach me right lmao. Anyways i got to the point where i decided to learn from someone the basics first lol. thank you

[@davidpopp3312]

Yo idk if you use ur yt anymore but brother ur videos are amazing, ur clear and concise when speaking and I learned more from ur videos in a night than 8 weeks of school

[@justart6579]

Me: did I learn more than what I learned in my college :o

[@infiniteawk8505]

Yep

[@Expediter_Ron]

Indeed. hahahaha

[@kentheengineer592]

You must have gone to the wrong college

[@luu1429]

What college did you go to the know that the homeless guy teaches inside his cardboard box

[@sedrixZombies]

Me learning it at 13 and under standing it 😆 and can't find pie

[@rohanjadhav4255]

why registor is connected after led .

[@galochamorro7632]

I am currently going to UEI and I thank you for explaining this way better then my instructor, so gonna pass my class now.

[@McGavel1]

Awesome info! I'm learning a ton, thanks! Especially cool points about improvising in electronics and showing how the DPDT switch actually works on a real switch - very cool! Also great stuff about using a multimeter and how to measure volts & amps.

[@jay22alco]

I'm learning electronics because I want to learn how to repair electronics and this tutorial is teaching me allot in understanding how each components work. best tutorial ever.

[@ashutoshmehrotra6037]

Very well explanation sir I am a beginner and your videos helps me to understand how a circuit work you gave very good and easy explanation thankyou so much

[@MrMaxBoivin]

The multimeter shown can measure microamp. the µ sign is for micro, which is much smaller than milli.

[@Abdullah-mg5zl]

*Summary:* - before physically building your circuit, design it (using schematics) - once built, you can measure voltage and current (as well as some other stuff like temperature) at various spots of your circuit - terminology: the little leads off a multimeter are called probes. There is a red one and a black one. - the multimeter has a bunch of ports. You plug the probes in the ports. - the black probe should always be plugged in the "com" port - what port the red probe should be plugged in depends on what you are trying to measure - if you are measuring voltage, plug it in the voltage port - if you are measuring amps, plug it in the amp port - let's talk more about measuring voltage - as electricity flows through a component in the circuit (e.g. electricity flowing through the LED component), some voltage is lost, we call this a voltage drop - in other words, the component "uses" some of the available voltage of the circuit - to measure how much voltage a component uses ("voltage drop across the component"), simply place the probes around the component - let's talk more about measuring current - to measure current, you actually have to make the multimeter part of the circuit - so make a gap in the circuit and put the multimeter in it - note: multimeters have a maximum amount of current that can should through them (see your multimeter manual) or they will be damamged - note: multimeters often have multiple ports for current, start with the port that supports the largest amount of current, and if the current read is smaller than what your smaller port supports, now you can use the smaller port - the smaller port offers more accurate reading for small currents Thanks so much for these videos! They are very fun and I'm learning/reinforcing a ton!

[@turuus5215]

Thanks for opening my eyes, this show's so helpful and easy to understand.

[@martymcgill1312]

I don't understand putting the resistor on the backside of the LED. How does that limit the current to the LED?

[@RedXIII382]

Because it doesn't matter if the resistor is before or after a component in a circuit. It drops the current in the whole circuit.

[@laboratoryteach]

I am 11 years old and understand everything thanks to you bro.

[@andrewtungsk]

Highest regards from a teacher in Singapore.

[@danielhaidar4059]

Youre explanations are very clear and easy to follow. Thanks!

[@thevintagehifiambassador8524]

good explanation that for current measuring, the meter is a wire ! Thanks a lot.

[@vedantsd2485]

thanks man love u brother thx to u i learnt a lot been searching for a good teacher in electronics for years

[@moungfu]

Thanks for posting these great videos! It's really helping get back to understanding electronics, after being away from it.

[@nigelhunter4230]

Great video and great teaching. Thank you Sir.

[@MrGatoka]

Question: Does the order of the LED and resistor matter in order to protect the LED from "frying"? These videos are great by the way. Thank you.

[@LocovsworldNL]

I have the same question

[@CodeNMore]

No - the resistor can go before or after the LED, as no matter what order the resistor still takes some voltage.

[@LocovsworldNL]

Alright i learned something new .. Thank you CodeNMore

[@brucelee12]

I'd have thought that you'd need the resistor before the LED to resist some of the current on the negative side since current flows from that direction. Interesting! Can you tell us why it works on either side CodeNMore? I don't get it.

[@sdx1969]

I'm indeed a new learner, and had the same question, but then I thought of it different way, assuming you have a closed circuit of water pipes, 75% of it is 2" in diameter and 25% as 1/2". The 25% is considered as a bottleneck that reduces the flow regardless of the location, and I believe the resister works as a bottleneck reducing the current flow in the whole circuit regardless of the location also. Hope my understanding is correct.

[@lachlanjames8492]

great stuff, I can't wait for more videos on the subject.

[@diazluis66]

love this.it's just what i was hoping to find. thank you. I was wondering why the resistor is placed after the l.e.d? for some reason it seem like it would be placed before. Again,, thank you for doing a fantastic job.

[@rarevinylgrooves]

You can place the resistor before and after the led (and switch) in this circuit - it doesn't matter, because all electrons move / flow at once.

[@jakeseeds4057]

hey mate awesome videos really enjoying them but i have one small piece of advice and it may be different as you are in america so you may have been taught different but in aus we only switch the + terminal, it still all works switching the negative terminal but you would still have a voltage at the led even though the switch is off if you switch the + you have isolated the led completely and the led is at the same potential as the - terminal 0 volts which makes the component completely safe to work on, if the negative is switched and then you accidently ground the led before the switch and resistor you could potentially destroy components so in practice the only thing you should ever switch is the positive if switching the negative you should always switch the postive as well through the use of a double pole switch, in an alternating current circumstance switching the neutral conductor creates high resistance neutrals and can/will cause the earthing system to become live and will also cause the disconnected/switched neutral conductor to become live

[@CodeNMore]

+Jake Seeds ahh, yes. I should probably incorporate those more-safe working methods in my series...I'm not the best with that :P. Thanks for the advice!

[@DarkSide-kj2vs]

Doea it mattter if u put the resistor after or before the LED?

[@NileshwarShukla]

In previous schematic diagram ,I saw resistor is connected on anode of LED ,here I can see it is connected to cathode of LED .Does it make any difference?

[@SnC-Coppermind]

Question about the schematic: Is there a standard for where the resistor should be in relation to the device/led or does it matter? Ex: Should resistor be on positive stream or negative stream

[@sstuddert]

yeah wtf

[@sstuddert]

it doesn't matter. Before or after is fine.

[@allanfaust1011]

I only had one question. In previous videos, you had the resistor « before » the led to « remove » the extra voltage… in this example you put it « after » and since ( one thing you haven’t mentioned, or maybe you did and I forgot) a diode is unidirectional… wouldn’t it cause the diode to burn out due to the current flow of the voltage? Just trying to get my head around it. Thx… your info in general is great.

[@chemistrylearner6029]

Great work....I thank u for providing us with such informative videos.

[@tastymacification]

Loving the series. Keep it up, you rock!

[@realliphe7447]

The resister doesn't need to be in between the power source and led?

[@GK-sh7ck]

Measure Voltage "across" a component. Measure Current "through" a component (circuit).

[@karkanan6208]

in 1:34 the resistor is after the led,i think the resistor should be before the led so it can protect the led?

[@josefrancis3714]

Good and simple

[@AkbarKhan-nf4iy]

It would be better & easy to understand if you draw schematic diagram of single pole single throw switch, you should also show the actual switch, repeating its' function, similarly all the switches should also be shown subsequently. I appreciate & thank you for such a clear & understandable way of presentation.

[@ramsaybolton9099]

Great job sir, thank you very much for your dedication.

[@Inexactbeetle]

I'm learning so much!!

[@ericklopes4046]

Now that's a high quality multimeter.

[@TheChronichalt]

www.amazon.com/gp/product/B01JZ1ADCO/ref=ppx_yo_dt_b_asin_title_o01__o00_s01?ie=UTF8&psc=1

[@bobbyd1961]

can I ask what are those terminals are called you attached to the bottom of your switch. I was trying to find them and I got ones that are too big to fit in my breadboard?

[@pascalizious]

Great lessons, your videos are easier to understand... Need to know how to build electronic project from difficult circuit design, will you make the lesson?

[@bleckbj]

Where did you get your 9v battery converters with the solid ends? Mine are a bunch of little one’s that I have to keep twisting together and it’s annoying.

[@csselement]

Does a resistor dissipate energy (as heat?) or does the power source just not give as much energy?

[@fullstackwithsantosh]

I don't really understand why resistors work while being on any side of the LED. I have watched a few other youtube videos, but none of them have given me a satisfactory explanation. Can you tell why? Also, does this stays the same if we are operating on an AC circuit?

[@GameDevHQ]

Hey man, this are amazing videos! Can't believe the quality is this high back in 2015! Quick question for you...on your diagram, is it backwards? I'm messing around with Arduino's and all the schematics show the Power going to resister and then LED... Your diagram is showing Power to LED to Resister. Do you have it backwards?

[@GameDevHQ]

After further research, it seems it doesn't matter. As long as you have the resister in there.

[@archentity]

For anyone confused, topmost row is negative rail and the row under it is the positive rail. The breadboard circuit made absolutely no sense to me until i realized this.

[@trevorlahey4345]

Hey, thanks for these videos! I have a question about measuring current. I noticed you touched the probes to the leads. Would it be okay to touch the probes to spots on the bread breadboard instead of would that be less accurate?

[@ethanpunto9222]

You could if you could fit the probes into the small holes

[@andrewswai5112]

Thank you for your lesson.But I have question why are we put resistor in negative side

[@user-xz9gm6ep5k]

I know it is a low-voltage application, but if I have a circuit where an LED comes first, followed by an resistor and then a switch, like in your video, will the LED's lifespan not be reduced if the switch is toggled on and off every second? Wouldn't the LED receive a surge of 9 volts instead of its safe 3 volts each time the switch is activated, before the circuit stabilizes thanks to the resistor, potentially causing faster wear and tear to the LED, compared to a setup where the resistor is placed between the switch and the LED and the LED comes last in the circuit?"

[@BaaderRAF]

you're doing a gfreat job here , keep going

[@joeybassbass]

Noob question - Would i be correct in saying that the jumper cable and the resister could swap positions, without affecting the behavior of the circuit?

[@chillyvanilly6352]

hmmm, well the weird thing is that you started out with (as u mentioned) the pretty much same schematic, yet IN REVERSE components order...have you forgot to mention to some beginners that the actual flow of electrons goes from the NEGATIVE terminal to the POSITIVE ?! Because right now, in this vid, it makes much more sense, since it is based on the negative terminal...right? Alos, great vids ^^ Cheers!

[@candiwibawa8030]

thank you so much for the new episode!!!!

[@sebastienpaquiet1317]

Hi! I really love your videos and have been watching them all day. I have question, Back in one of your beginning videos you mentioned that dc current like the battery only flows in one direction. In using the 9v battery, does it flow from the negative or positive side? also does the sequence matter that it flows through the various components? If it flows at about 9v from the battery then hits the resistor and brings it down to about 3 does it remain at 3 for the rest of the circuit?

[@thesphericalguy9018]

Have you gotten to the bottom if this yet?

[@hairypooter4110]

This is 3 years too late but someone else might benefit. I'm extremely ignorant but I think I know enough to answer your question. Electricity flows from negative to positive but that isn't really important right now. Sequence doesn't matter for these components but it may for others, I don't know enough yet. The resistor makes the entire circuit 3ish volts, both before and after itself.

[@TheKlickitat]

You stated that the resister uses up current. Does it consume power like the LED or does it just restrict current? If it consumes power is it creating heat then?

[@nikkoespritu5139]

TheKlickitat yes, resistors dissipate energy which is converted to heat energy that is why resistor wattage is important when designing electronics

[@TheKlickitat]

thank you for the explanation.

[@heidik1757]

does the order matter? or we place the resistor before the switch and then the LED?

[@isaachookes889]

I have a question! If you had 2 30 Ohm resistors would both of them together make a 60 Ohm resistance?

[@BrianJamesHicks]

If you put them in series then yes, but if you put 2 30 ohm resistors in parallel they resist 15 ohms.

[@jamesharland3727]

Thank you for this and all your other videos. To measure current, couldn't you have plugged the probes into the breadboard? (Red to the positive power bus, black to the row with the longer leg of the LED?) Or is there a reason for just touching then rather than plugging them in?

[@weidnermusic]

I paused here wondering why the resistor is placed after the LED and chat gpt told me it's generally recommended to connect the resistor before the LED (but then chat gpt messed up and said "To summarize, in a simple circuit with an LED and a resistor, it is generally recommended to connect the resistor in series with the LED, with the LED positioned between the resistor and the positive terminal of the power source." THEN i asked chat gpt if he's tripping and he said "yes i am, Apologies for the confusion. You are correct, and I apologize for the incorrect summary in my previous response. In a simple circuit with an LED and a resistor, the correct placement of the components is as follows:" So now i'm even more confused :)

[@Lucky-jm5if]

Thank you so much i am on episode 14 n i hv learn so much from this

[@ragtagdb97]

Thank You!

[@CraftingModernMen]

Doesn't the resistor have to go between the Power source and the controlled component? The diagram showed it on the ground side.

[@catherinemarsh5453]

When you say "make sure you don't have any shorts", could you give us an example of what that would be?

[@amauryaliagavalier7289]

Does it matter do you put Reistor first or after the Led

[@zjpeterson5674]

Hi, I have been following along with these videos, but is it possible for you to explain how I put the switch into the breadboard? I see you have wire on yours, but you did not explain how you added them and I do not want to try something and mess up.

[@avrumisolaimani8546]

ZJ Peterson he i attached the wires to the switch i think soldered but i forgot

[@EricColeUK]

What direction would you say current flows, if we are going to use the 'water analogy'. Postive to negative or negative to positive ??

[@dragonv7863]

would a resistor come before LED on the schematic? since it's direct circuit, power come straight to LED and would need resistant control the flow of electron, right?

[@naderhumood1199]

I'm learning new thins Sir. Thank u v much

[@gow2626]

hey codenmore, first I just want to say I really appreciate you and the vids you make. ive watched all videos up to this point and so far only have had one question how can you tell which end of a resistor to read first using the chart from your website?

[@avrumisolaimani8546]

Tommy Goodwin i remember i talked about it for like 15 seconds either go back and check or google it

[@sabrinalewis3091]

What site would you recommend to purchase electronics components, e.g. resistors, capacitors, switches, etc.?

[@stormes28]

Can you please make new video about how to measure in slow way and more explaining all the details for calculations and how we got these readings. Thanks in advance

[@sharonjuniorchess]

What specifically do you not understand?

[@alexsanchez1620]

This is such a good video. Nice job

[@TheDiblopops]

Does resistors place matter? If it is on the positive or negative side?

[@memnuniyetsizadam8195]

How it can be DPDT? Is this plastic where between the two wires is unconducive and they don't connect each other? I think it must be SPDT.

[@scottsparks4392]

Is there a specific reason why you connected the wire to the negative slot on the power rail?

[@user-rb5gf4xx1g]

does a spst switch make only one connection if it does is it activated when i turn the switch on?

[@Kayjjay001]

Please I'm asking question concerning the LED. what's the main purpose of this LED is it indicator or it have series of purpose and if yes please list them

[@pruthvi218]

what if we cut the longer length and shorter length of the LED's equally! How do we identify which one's anode or cathode?

[@BranchusCreations]

You wrote the value of the power source and the resistor on the schematic, so why didn't you write the value of the LED as well (i.e. 3.2V)?

[@darbywing2]

3.2 volts is the max recommended voltage to be applied to the L.E.D.. It is derived from the maximum current (heat generation) that can pass through the L.E.D. without damage.

[@stormes28]

I connected same thing but with no switch as i have one in the power module, I measured the v in the led and found it 2.84 but in the resistor is 2.05v, can you please explain why this difference between our readings, i am using 330ohms resistor

[@dlouise64]

Thanks for the great videos, have helped me a ton.

[@almadijayangaming834]

Sir can you also explain how to use a non auto ranging multimeter

[@nitinharikakadee]

you are a best explainer👍

[@fizzay87]

I see only 3 pins, did I miss the other 3 pins for DPDT in the video?

[@alanburton8758]

hi,in episode 12 you show the resistor between the +terminal of the battery going to the led,then in episode 14 you have wired it to the - side of the led through the switch to the neg ,i'm confused to which way is correct,many thanks,Alan

[@paschalconneely2374]

+Alan Burton For this circuit it doesn't matter if the resistor is in front of or behind the LED so long as it is in series which means one after the other. Think of the wire in this circuit as a water pipe and a resistor as a blockage in the pipe. It doesn't matter where you put the blockage it will slow the flow of water in the whole pipe. If in doubt with circuits think of water in a pipe.

[@crownprincetaze]

So does it not matter where the resister goes, either before or after the component?

[@Rino6357]

Why does the resistor need to be before the switch? Why does the order matter?

[@emmjorge88]

In this case. Does it mather what order you conect the "swich, LED, and Restistans" ? or can this work in any order? Lets say, the resistance first. then the switch, then the LED?

[@aj.tgaming8388]

I don't understand?

[@Kami43644]

You can put the resistor after the LED?

[@03toyotacorolla]

Great tutorial man!

[@shsftech3792]

Wow very helpful video.. thanks so much!

[@carlnikolov]

In the earlier video you connected the resistor first to the positive lead of the LED and battery then the negative leg of the LED to the negative terminal of the battery but in this video you are connecting the LED positive leg directly into the positive power rail... The negative to the center of the bread board which puts the resistor on the negative side of the circuit. Can you explain that one to me it seems the opposite of what you did earlier

[@GlumWretch]

It doesn't matter. You can put it either way, because electrons flow through the whole wire and it doesn't take into account how you put the LED and it is doing its job anyway. Although this is a different case from the one you mentioned, you have to be careful how you put the terminals of the polarized components(i.e. for LEDs, the anode towards the positive side and the cathode towards the negative side). There are also unpolarized components (like the resistor) that you can put with the terminals in any way. Summary: You can put the resistor before or after the LED, its position is irrelevant. You can also put the resistor's terminals either way, it doesn't matter, but you have to take care for the LED to have the anode terminal towards the positive side and the cathode terminal towards the negative side so you don't burn the component.

[@zombieateet]

Hi buddy! Nice video very informative content! Hey I have a doubt? If I need to make a circuit where power source is 12v and 10amps and a load of 12v with 6amps with two fans of 12v 0.18A and 12v 0.08A. Can you tell me if there is a need for other components like resistor and capacitor or anything else to complete the circuit? I am a layman so please share your thoughts.?