Electronic Basics #17: Oscillators || RC, LC, Crystal

[@devjock]

Ahh the good old 555. THE Gateway drug to pal's, gal's, pic's, avr's, cpld's and ultimately fpga's. Good luck with that build up ;)

[@BruceNitroxpro]

devjock , I know it took three years to read your joke, but it's a hoot! LOL

[@sovietbear3024]

​@Caiden Mateo ​ Can someone say bot?

[@JerryEricsson]

Thanks for the video, it clears up some of my confusion when it comes to tank circuits. I have always maintained that if you can learn one new thing every day, it will keep your mind active, and prevent age related deterioration. You sir, are keeping my mind young and active. Combine this with our desire to see new and wonderful things by traveling these United States of America, and I can stay young for ever!

[@thomasarmer7771]

Congratulations Greatscott! Really great, especially for someone like me who's just getting again into electronics.

[@lifetech4146]

Me too

[@PhilWaud]

Thanks Scott, Im learning a lot from your videos, much appreciated.

[@freeelectron8261]

Well done! You managed to cover a lot of oscillator theory in a nice little video. A must see for beginners or oscillator nerds :)

[@parkerjohn2459]

I like this series .

[@benvivitron]

+Parker John I like this parallel

[@artvandelayimports]

+le jokur so bad it hertz

[@krisztianszirtes5414]

Ohm y god I hate these jokes...

[@deepspacemachines]

+RandomVideos Let's not get too amped up ubout this.

[@micha-qg7bo]

+Marrus Q I just can't resist.

[@emreceylan9979]

One of the best videos on youtube about oscillators. thank you!!

[@mkarhade]

You SIR are the new teacher that I am following ! Rekindling my physics and electronics that I lost while learning medicine ! THANK YOU SO MUCH

[@yodad4776]

awsome videos watching some of your older videos your english has actually improoving with time and more videos ,you probably dont notice it yourself,go watch your oldest video then your newest video you will hear it

[@emertes17]

A lot of that went over my head. I might have to watch this video a couple more times

[@AMadScientist]

I was lost right after he said, "if you ever tried to find out..."

[@profyle766]

Bro...baffled...i got some crystals...i just need an electronic voltage reader/creator withing the crystal range....Simples!!!

[@JaydenLawson]

Ahaha I was just about the write the exact same comment 😂 either that or, “You lost me at 0:00” 🤣

[@AMadScientist]

@@JaydenLawson LOL

[@panda315]

😂

[@leozendo3500]

would you make a video about how to measure inductance?

[@greatscottlab]

Sure

[@abbasmaheryar1111]

LCR meter

[@EricSlatten]

kzbin.info/www/bejne/q4aVfKSOrLZkbMU

[@TheGameBusterPL]

Apply a known high frequency square wave with a known voltage and measure current flowing through it, then you can calculate the freq. by using the coil reactance formula backward.

[@kameelamareen]

You can measure it using a Maxwell Bridge, its a null type AC Bridge that measures the inductance and also the resistance of an Inductor (quality)

[@darcam]

Thanks you for your time in making these video's. Somethings i understand but a lot is over my head. I still like to watch them. again thank you.

[@gulhermepereira249]

You're more didactic than my professors in uni

[@crisg9170]

best one basic video yet greatscott! learned a ton!

[@greatscottlab]

+Cris G Awesome!

[@KenSharp]

Finally! That LC circuit I made at uni makes sense!

[@h7opolo]

your videos are the best electronics tutorials on youtube. if only you didn't have an accent... nothing's perfect i guess.

[@Muck-qy2oo]

I built one simple Pearson-Anson oscillator. It creates a saw tooth signal with a glow lamp and was used in analog sound synthesizers. Glow lamps have also been used in noise generators.

[@gamestv4875]

This oscillated my mind. Thanks

[@km5405]

Great intro to oscillators ... makes high frequency oscillators look a lot less scary now!

[@waleedalsharif1183]

thanks for all great information you give it to us i from egypt

[@featheredskeptic1301]

Very nice and educational video. Oscillators are really fun to play with - blinking LED's, buzzers and tone generators, high voltages and flyback oscillators, spy bugs and so on fun stuff that's easy and fun to make.

[@JonathanKayne]

I recently learned that you can make a square and triangle wave oscillator using a single op amp. It is simply an RC circuit in a comparator (I think that is what the configuration is). The capacitor determines the frequency range. Higher = Lower frequency range. I used a 10uF capacitor and my range was 1-200Hz.

[@neptunian5686]

Perfect for a bicycle lighting system :)

[@HPnoStory]

alhamdulillah.. I got the clearly explanation.. thanks mas bro

[@0Bariq0]

thank you so much. this video is exactly what i needed right now. im currently studying oscillators and was having a bit of hard time wraping my head around things. please keep this series. thanks again.

[@gtwo05]

If I only had a fraction of your knowledge I would be a happy man. Keep the videos coming 👍🏻

[@arthurcascardo7202]

At 4:39, did he exclude the resistor on the collector side because of intrinsic resistance of the coil?

[@rockndancenroll]

I would say that this is the reason. Have you understood the rest of the circuit? (LC tank, feedback) I have difficulty understanding how the feedback works here.

[@asmahoseini4393]

با این که رو این مدار اسیلاتور هنوز کار میکنم و هنوز موفق نشدم ..با این وجود این کلیپ یکی از بهترین کلیپهای آموزشی است.دیگر کلیپهای موجود در یوتوب هر کدوم یک جورایی بدرد نخور است مثلا یکی نقشه ندارد یکی فقط لحیم کاری را نشون میده یکی یکسره فرمول ریاضی در مورد اسیلاتور نشون میده و فقط تئوری میگه که یه قرون نمی ارزد...خلاصه این کلیپ و این کانال کارش درست هست علاوه براین که زبان انگلیسی این بابا خیلی خوب و واضح است

[@Diego612010pd]

Can you make a video where you show in detail how to use the oscillator at 4:39 and how to vary the frequency with audio. Also how to make a FM transmitter.

[@adekanmbioloyede4727]

great Scott, am a Nigerian ..learnt so much in electronics through your channel..though only the geeky can get along with your videos.. pls make a video about registers.. thanks

[@marcvictor5305]

The video of registers is already made: Arduino Port Manipulation

[@douglasquaid1418]

Can you make a video about the oszilloskop? I like your videos, do so on !

[@greatscottlab]

+Noah Oertli I put it on my to do list.

[@arv1ndgr]

+GreatScott! +1 again! 😍

[@alexdelarge3397]

woow so much information to assimilate if you're not really involved into such electronics

[@jamierollinson9354]

Is there a difference between a rectangle wave and a square wave?

[@greatscottlab]

+Jamie Rollinson No. I noticed after recording everything that I used the two different terms. My mistake.

[@homemadelaboratory3140]

+Novislav Djajic Every wave has a duty of 50% if its proper

[@74oshua]

Homemade Laboratory not in pwm signals

[@paulbennell3313]

Only in terms of duty cycle.

[@32COMEDIA]

Wie man sofort hört dass du deutscher bist ^^ Aber sehr geile videos machst du, respekt

[@farukdiyebiri]

Hahaha. To be honest, as a german learner for 2 years now I didnt get it until I saw your comment. So that's not that of a thick accent in my opinion. tschüss =)

[@CShand]

Would love more on the crystal oscillators

[@davepowless7227]

THanks for the great tech bite...Always enjoy these videos!

[@isuruchaminda7862]

Pff .. finally i founded usefull video . Now i know how oscillator works thanks a lot ! God bless u 👋

[@dragos7puri]

Video is too short, and there isn't enough explaining done.

[@davepowless7227]

You could always watch more in-depth explanations at Khan

[@marc2377]

+Dragos Puri More than "short", I'd point out that it leaves little room between complex sentences. I advise the author to slow down a little bit on the explaining, at times.

[@mdesm2005]

+Dragos Puri he's wetting your appetite

[@flaviuhossu3005]

+Dragos Puri Do a research then.

[@dragos7puri]

+Flaviu Hossu I will when necessary. But it's much easier when someone explains it to you.

[@hypt0ny]

Love your videos man! Wish i had your workshop so i could try all these things

[@alphonsereitz]

Out of all the things I've learned about electronics... the biggest thing by far... I need an power supply/oscilloscope. Thank you for this video though, very informative.

[@deadlinkofficialartst5592]

you just made a analog synth 101😎

[@arielmetamorphosis]

I learned more in one video than In one semester at school ,,😮

[@suyashrajpure3562]

One of the best video on oscillators other than electroboom But you could have made it more long. Please make a very long and informative video on oscillators. Please. It's very important to understand. Thanks

[@xcubetech2782]

Tbh the only video I found it answer my question

[@zamanashiq3]

your videos helped me a lot in electronic basics, thanks a lot man.

[@gudenau]

I'll probably look at this a few times, great job.

[@jacobmartin8332]

That intro is pretty cool.

[@rockndancenroll]

Thank you for this video, I used the topology at 4:39 for the colpitts and it works perfectly. However, I cannot really grasp how the LC tank is formed (inductor is not in parallel with the two capacitors), and how the output of the LC tank is connected to the input of the amp ( I don't see a feedback path going to the base of the bjt). Could someone please briefly answer me those two questions? Thanks

[@kaustubhmurumkar2670]

1) It is an LC series resonance circuit 2) The capacitor voltage divider is connected to emitter resistance, it acts as a negative feedback.

[@vasamith6452]

It's a very nice video, much appreciated.

[@rjraj5512]

I like your all electronic videos

[@mihirthanekar1482]

Thank you so so so so much! Your videos are excellent, and I finally got the astable multivibrator working!!! :))) Keep making more awesome videos!! Thank you so much =D

[@snchit4575]

i thought crystal oscillators were some sort of a fancy capacitor. Now i have something thats knteresting in my parts box now. thanks for the explaination!

[@BoomBrush]

i like the addition of the eagle drawings rather than the handwriting, sometimes it can be hard to read good job :D

[@kurosakiconnors6329]

Um, at 1:21 in the diagram are the wires between the base and capacitors joined or just crossing over?

[@stefmijs8238]

good video great scot i learn a lot of your video's

[@CatFish107]

The intro forgets to mention oscillators for sound synthesis.

[@RegiPavan]

Nice and straightforward information as always... Great job!!!

[@amupitanmichaeladesoji7881]

I just come across this video. But I have a little question about this oscillator circuit like LC or crystal oscillator... Can any one of this be used with an inverter circuit to produce since wave at 50Hz?

[@blackice273]

thanx for the info .. but realy how are you .. you are genius .. i love your work .. i dont stud electronics .. but i learn alot from you ..keep the good works on ...👍👍

[@zezeA380]

I find your videos (GreatScott) is much simpler to understand than afrotechmods. Still, both are good!

[@tl2797]

I just love your videos! Keep up the good work!

[@jack002tuber]

I'm very interested in the circuit at 5:27. What are the values of the crystal and the cap at the bottom left?

[@WaleliMoonrise]

Great video. I don't know anything about this kind of thing. But for whatever reason I woke up and wanted to know exactly how a radio works. I looked at page after page, video after video that just told me that a carrier wave has a modulated wave blah blah but no one mentioned anything about how the carrier wave was made. After a few hours I was yelling at the screen WHAT MADE THE CARRIER WAVE, GOD? MAGIC? Anyway, thanks, this video explained a lot about how waves/frequencies/etc are created in the first place. :)

[@61barrackroad]

Another great video 👏 👏 Look forward to watching your videos as they're so well made,keep it up look forward to the next installment,have shared this to twitter hope thats ok? Also recommended your videos to lot of collegues Well done & thanks👍

[@greatscottlab]

+Robert Thomas Thanks for sharing ;-)

[@61barrackroad]

+GreatScott! your welcome,did u ever think of writing a book?Just an idea 😉 Thanks again.

[@gurkancekic9057]

very informative and efficient time usage

[@connor5847]

1:25 I don't really understand how the capacitors get charged alternatingly. Unless I'm overlooking something, the circuit is perfectly symmetric, right? So by my logic, C1 and C2 should get charged at the same time and should then activate the transistors at the same time. Also, how does C1 discharge exactly when transistor Q2 is conducting but not Q1? Through the base of Q2? If there's still someone who reads these comments, please explain! Thanks!

[@dafuqucare2527]

great explanation, thanx. but what to do with the oscillator once you have it?

[@greatscottlab]

+Dafuq Ucare As a start it is always fun to turn LEDs ON and OFF ;-) But I will show some other applications in future videos.

[@michaelzajac5284]

I used my computer into the "iCircuit." I could open my eyes, it's Forward Circuit. Thank you for Tutor. :)

[@michaelzajac5284]

+Michael Zajac Arrows indicate the direction of electron current flow.

[@igbuilt8829]

Because the crystal sets the micro controller speed, does that mean that if I changed the crystal I could change the speed of micro controller and if so, assuming there would be limitations how much could the speed be changed?

[@lucystanley7470]

Yes. It's essentially what happens when you overclock a CPU. The device might function at a slightly higher speed, and increasing the supply voltage can increase this maximum, at the cost of higher heat output and a shorter lifespan.

[@npip99]

Eventually if you overclock too much the crystal will resonate faster the processor can compute, leading to incorrect calculations. It might only be half-way done with its multiplication operation but the crystal ticked and now it saved an incomplete value. Generally you'll have very little overclock room before you get incorrect calculations, since they already calculated the highest valid frequency for you.

[@peshmadscientist1833]

If the micro proc. could function at higher clock speed, they would have used a higher freq. oscillator in the first place.

[@odouls779]

The 555 Timer is a versatile device making it simple to make oscillators and others.

[@nazihahmed8623]

why is the symbol of the + on the right (at 1:39) and you say it charges through the 47k resistor which is the negative end according to the schematic, shouldn't the symbol be reversed ?

[@electronicdiy3738]

As shown in the diagram, the + is always connected to the collector. To understand the operation, it is the charge of C1 that controls the "on" of the transistor Q2 at the same time that the discharge of C2 controls the "off" of Q1 and vice versa. when C1 is charging, the current from Vcc passes through R1, LED1 and the base of Q2 to join the GND. Q2 is then active and the current of the collector Ic2 lights the LED2, C2 takes advantage of this state to discharge by moving the electrons of its armature (-) to + Vcc via R3. Thus the negative of C2 which acts on the base of Q1 is brought to the potential 0V and Q1 is blocked. C2 being discharged, sees its negative in direct contact with the GND and starts to charge via the base of Q1 which will immediately activate to turn on the LED1 and open the discharge path of C1. And so on the cycle repeats itself continually ...

[@electronicdiy3738]

To watch a simulation of the oscillator, visit falstad.com/circuit/ on the bar at the top, click on circuits, put the cursor on transitors then on multivibrators and click on astable multivib

[@tomasz6687]

@@electronicdiy3738 Why current through R2 or R3 doesn't flow straight to the base of Q1 and Q2, but stops at capacitors C1 and C2 to charge them up and then "disappears" from this line?

[@electronicdiy3738]

@@tomasz6687 because of the asymmetry between C1 and C2, due to specific tolerance of each even if they are similar, a capacitor with the low time constant R1C1 or R4C2 must be charged before the system oscillates. During charging, a current flows through R2 and R3 but does not flow directly to the bases of Q1 and Q2,one current must be negative, while other is positive. The negative current is that of the capacitor which discharges through the transistor connected to its (+), so that the negative potential across the capacitor becomes unable to trigger the other transistor.The positive current flows through the second resistor and the second capacitor charges, that positive current activates the first transistor allowing the negative discharge current to reach the GND.

[@tomasz6687]

I think I found my answer: while charging capacitor C1 is conducting current and according to not very precise but mostly true statement "Current takes the path of least resistance" current finds easier path from Vcc and R2 to mass through this way than flowing directly into transistor Q2's base. When C1 is charged to at least 0.6V then it turns Q2 ON. Next C2 gets discharged to 0V through Q2 C-E what turns OFF the Q1. The cycle repeats respectively. Thank you for the hints.

[@herobrine1847]

4:30 I really wish you explained the amplifier part of the circuit-that’s what’s confusing to most people, not the tank circuit.

[@vincentstuchly5313]

I have idea for next video of this series : logic gate. Please I am very impressed about this.

[@ing.biomedicaenlapractica6871]

So beatiful, thak you, from México City

[@danwheeler136]

Very well explained. Look forward to next time :)

[@a_random_guy_V]

Wow that opening is magnificent, why did you take it off?

[@a_random_guy_V]

Even though I know I'll never have the answer

[@czarcorey1220]

I am doing RLC circuits with timing applications in my circuits class and timing with E clock and input/output compare functions in my microprocessors class now so this vid is perfectly timed(pun intended) for me now.

[@Gijs7156]

i've been looking for a video like this, thanks!

[@jaasimansar]

For the circuit at 5:31, If I connect an antenna to the Vout, will it transmit radio waves with the frequency of the crystal?

[@dandwrasan2342]

Jaasim Ansar hi please can you help me with some questions about this vid 👍🏻🇬🇧

[@rachitshah598]

love your videos man

[@greatscottlab]

+Rachit Shah Thank you :-)

[@Algird75]

As always great video!!!

[@Pascal_Robert--Rc_Creations]

can you make a video on how to mecanically change the refresh rate on a multimeter? that would be nice!

[@martinplas5343]

this is probably gonna get buried but is there any way to change the frequency of a crystal to possibly a sub harmonic ex: 12mhz to 1.2 MHz without changing the crystal?

[@kajojo2399]

In electronic watches they use flip-flops, each flip flop dividing the frequency by two. Yeah ik, reply two years later.

[@nsfeliz7825]

use a jonson counter.

[@anjunzhouJack]

hi there, i was trying to reproduce the circuit in 1:43, but a big confused by the polarity of the capacitor. why is - side of capacitor connect to 9 V?

[@taz0k2]

I like your videos. Good work. At 4:33 I don't understand what's what. There's one coil but three caps and I don't understand which cap of them that makes up the "tank circuit".

[@TWmissionWT]

Can you also explain oscillators with variable frequency, which are stable (keep the same waveform without attenuation or distortion) throughout their whole spectrum?

[@juanpablomochen109]

Hi! One query: I have to perform an oscillator to maintain a QCM at its resonant frequency which is 10 [MHz]. I could use the last circuit you showed but I don't understand how to choose the components according to what the resonant frequency is. Very good video. Greetings from Argentina.

[@luis96xd]

Amazing video!

[@Richie_]

Can you do a video on capacitor types and what each type is typically used for.

[@unknowndj242]

Wow I Love it.😍🤩 But I suddenly think, How you become so great and know to make this circuits and make it work. Can u make a video with it. Thank u

[@kornol]

i learned a lot about the muscle movement of your left hand while you were covering up the drawings

[@jeffnay6502]

What viewer like myself and many others here are trying to say, is we want to build these circuits with you while you explain them. Watching you go through something are are already very familiar with, does not do anything for your viewers. We learn best by doing, not watching someone else do something.

[@brocksamson8634]

Great informative video, I learned a lot here, thank you. What kind of pen do you use for your schematics?

[@pkart8451]

4:37 electromagnetic wave can produce?

[@luiscesaremanuelli]

great job man, thanks

[@TonySkiens]

Schmidt trigger is even easier

[@naveenkumarau7007]

Super sir i learn some much from your channel do more videos sir I am your fan sir

[@iddiadam857]

Great job sir.

[@amatech5222]

great video. good explanation.