Simplest oscillator - Make an LED Blinker and Tone Generator
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- čas přidán 5. 09. 2024
- This time, I show you how to make the probably simplest oscillator in the world.
An AtTiny 85 is simpler, but it's not fair to have an IC. So anyway, the circuit uses a transistor in a way it's not usually used.
I realized that I can make a super simple oscillator using some property of the transistor when I was experimenting with one. I see that if a transistor is placed in a certain and given a certain voltage, it becomes essentially conductive.
I continue experimenting and come out with this circuit after some hour or so, to find that someone already posted about this before me. Well, I was quite disappointed, I thought I've just invented something new, but nah.. Whatever. Let's just talk about the video.
You can use a 2n222A transistor, but you'll need to configure the pin layout yourself, not a big deal, but I'm just saying what I need to say.
This video has a surprisingly high quality, I got a new mic, new colorful lamp, and new oscilloscope. So teaching electronic is now easier and more exciting.
Enjoy the video, you don't need to be an electrician whatsoever to make this. Don't need an extra tool, any hard time, or hardwork, you don't even need to understand how it works. Just buy a 1K ohm resistor, BC547 transistor, 150uF capacitor and an LED at your local electronic component store.
'Hope you understand what I'm doing in this video, and see you next time.
By far, the best presentation of this concept on CZcams.
Finally i have a solid idea of how a transistor oscillator works thank you for the simple explaining.
Great explanation! I'm just starting to teach my kids about electronics. And it's amazing how hard it is to find an explanation for a simple circuit like this.
Finally the true science of a blinking led with a good explanation. Thank you sir and keep on.
Good video. You might want to add the fact that the transistor is reverse biased ( Emitter is on the positive supply). This creates a slight negative resistance within the transistor when the current is applied and that's what creates the dead short allowing the current to pass thru to the negative supply. Just my thoughts. Thank you.
Hi. I'm becoming crazy with this. Why the PNP transistor is conducting even without any potential/current/circuit applied to the base ? I'm trying to find this relation somewhere , but unsucesfully. The basic theory of transistors never told that the transistor is conductive without any applied current on the base. Thanks
@@Mark-sq8mhIt's the breakdown voltage. Imagine an air gap, for instance, between two close wires with an applied voltage between them. With a high enough voltage, the air becomes conductive, sending a spark between the wires. All diodes have this property when reverse biased. The transistor here is being used as a simple diode, just like an LED in reverse polarity relative to the power supply.
@@Noconstitutionfordemocrats1 thanks, after long time I don't even remember my question
First time I’ve seen this circuit explained . Others just build it and that’s it . Thanks !
I feel privileged to be one of your first subscribers. Please keep doing this.
On behalf of all noobs, thank you for slowing down. Cheers!
Best explanation ever. This is very helpful and easy to understand transistor circuit for beginner like myself.
this is the right video i was looking for some experiment about variable flashing of led thank you
It's an Esaki oscillator. 👍 Nice representation.
Thank you for this, very well put together :D
The video I was looking for!! Thank you very much!! Experimenting can begin!!
I'm creating an alarm device (beeper) on USB and needed this.
Great video. Very much appreciate it.
Keep the leads short, or you´ll have a broadband jammer. Depending on the transistor up to 500MHz.
It´s not the low frequency oscillation that causes it, but the rapidly falling slopes when the transistor breaks through.
Can I use a zenar diode instead of BJT.
I made this and it works perfectly
Your this video deserves 1lakhs of views 👍
Why does the transister cascade due to the capacitor, but not due to the power supply alone?
hello! how do i make a speaker circuit to identify pwm.I don't have much knowledge in electronics and my resource is little.
A few days ago, I learned that this circuit is called "The Esaki Oscillator"-or something similar- and is actually quite famous.
So, yeah ... I just feel like I need to tell you this unnecessary information, or maybe necessary for some, idk.
I appreciated the detailed layout and explanation. I now have one working and can view it on the scope. First step of the high frequency motor drive complete :) Thanks.
Nice video, a joule theif circuit is kinda famous too.. I need to learn hfe and understand transistor math, do you have a video on that, or maybe point me to one. ?
Excellent explanation. Thanks very much!!
Great explanation, thank you
what's the principle ? Is it avalanche breakdown of the transistor ?
With the base open vce will be at vcc. Am I missing something? There should be no current flow between the emitter collector.
not sure if i can use this for a DC-DC boost converter but thank you for the tutorial!
Simple and clear. Thx for sharing.
Very very nice
Awesome mate 👍😁finally got it!! 🙌🏼
What is formula for find it's frequency.
good replacement for 555 ic
Thanks, cool video for a training class I am giving.
So the transistor operates in an avalanche mode and the circuit is a relaxation oscillator?
I can't understand, how transistor is working, means how emitter and collecter is connected without giving input on base pin
No input on base, no output in emitter, but how in this it is working??
I can't get it to work. How the hell is the transistor supposed to open if nothing is on the gate??
Can I use that to control a transistor?
Can anyone please tell me that how can we make led blink but slowly. I mean dimming led and then lighting led slowly.
Hello!
Can you also show how to connect it to bread board too please!!!! I really need to make it!!
Well done......keep uploading...keep growing
"Good", very good 😉
Looks crazy 👌
Awesome video! Great explanation! But you killed my ears with that high frequency shit at the 4:31 😁
The circuit doesn't work for me. It only lits up when the base of bc547 is touched by my finger and it doesn't blink too
I guarantee that you put a speaker in place of the LED you would be hearing sound. I can get sound but no blinking LED -- it could be wrong voltage rating but I dunno I am still just learning! 😂
Ok I got it to work. It seems that some transistors will work with only 9V but I have a lot more testing to do. If you have a 2N2222 handy give it a shot, as well as the S9018, they *might* work with only 9V.
what doesn't blink... the LED or your finger?
Is the supply voltage bigger than 2v? Did you wire up the transistor correctly? the emitter should be connected with the resistor. and also be careful with pinout of the transistor, it always different depending on manufacturer and type.
Excellent bro 👍👍
why don't you use a p-n junction diode in place of transistor
Arsyad can u make another transistor video showing a multivibrator circuit?
Where is the transistor base connection..?
Are u using 9v for this?
Do you have an overhead picture of the breadboard construction?
Sorry for inconvenience but I don't see.the base of the transistor connected any where!!
That's the point :) we're using the transistor in a non-usual way
Im going crazy i think, ive spent hours trying just to get a blinky light, and it just wont work, im using a 2n 3904 and 10uF cap...
Are you running at least 12volts thru it?
use a 2n2222 npn trans. a 100uf cap and 1k resistor @ 10v worked first go.
I have tried it with 2n3904 , 2n2222a . With 12 V supply. Doesn't work. Using bc547 it worked, but only when I touched the base of the transistor with my fingers. What is the reason?
@@souvikdey9178 Maybe its too late but anyway... It happened the same to me, the thing is that the BC547 has Collector and emitter in legs 1 and 3 respectively. And the 2n3904 it is iniverted. So, you have to connected inverse from the connection shown on the video.
Sir, I am new in the field, my little understanding is that the transistor can't switch on without a base voltage of about 0.6v. a look SE your emitter isn't well connected, please help me know how it is possible
As I said in the description, this circuit utilizes a property of a transistor in a rather uncommon way. It is true that a transistor generally can't switch on without a specified base voltage, however, there is a limit (threshold) as to how much voltage a transistor can handle before it becomes conductive without doing anything to its base pin.
This video shows how we can use the information of the transistor's limit to then surpass it and use it to our advantage. Hope this helps :)
@@ArsyadKamili thank you sir
@@ArsyadKamili You mean you used the revers bias voltage (breakdown voltage ) in a small time period ?
Let me try first.. It didn't work out with other videos.
Thank you.
Superb
Hello great work here !
Can i ask about what a difference to this schematic, have between the Bc547 and Bc547C any choice can works property ?
Can i keep both the led and the audio out together in schematic as lighting effect, and how ?
Greetings !
theres no difference
This is not the only circuit where nothing is connected to the transistor's base. Optoisolators use an LED and phototransistor with nothing connected to the base.
awesome video! subscribed:)
On 4:10 you exchanged the resistor with a variable one( a potentiometer). Was this a 1K potentiometer that you used? Today I experimented with a 20K potentiometer, but I only got 1 tone.
That's a 10K one. But regardless of what you use, it should give variable tone. So maybe you connect the potentiometer the wrong way? Try checking your connections.
No it's then I think because I use another transistor(which I recycled from a board), not a BC547-transistor. I linked the + of my 12v-adaptor to the middle leg of the potentiometer and the right leg of the potentiometer( when the pins are pointing towards you ) to the +-side of the speaker. Many thanx for your fast answer! greetz
Is this also changing polarities ??
Not working bro
😫😫😫😫😫😫😫
Can you help me to build a simple oscillator with the output of 2hz and amplitude of 2hz? I made one but in simulation it's showing different result.
Why not use a simple 555 circuit?
@@ArsyadKamili sir I have used one. But unfortunately it's not working .. can you give me a schematic? Input 9v and the output is 2hz and 2v (amplitude)
Thanks 👍👍👍
Whoah! That's Marvelous.
Can you answer me how to make 528Hz?
Can I use trimer 4.5-20pF, beside 150uF capacitor?
it is easier to use a trim resistor instead of trim capacitor
I think even if you reach the 528 Hz it would not be stable enough, so the frequency will swing a bit
That was great!
awesome
The circuit didn't work for me :(
Nice
Wouldnt a schottky diode work for this too then?
No
It wouldn't as it's not going to have anything to change its impedance suddenly. The transistors base gives it that change in the current going through it.
Although you bring up an interesting point. The base of the circuit is not connected or controlled.
You could however try a zener diode reverse biased. This would mean conductive only after a certain voltage and then switching off..
"The capacitor is charged slowly until it reaches a certain voltage point where the transistor becomes conductive." - This is quite confusing.. Can you elaborate?
Think of the resistor and the capacitor as a voltage divider, with a unique characteristic: a voltage divider that has a changing output voltage (the voltage between the capacitors slowly builds over time).
When that changing output of the voltage divider reaches the threshold of the transistor, the transistor suddenly acts as a conductor. Current then flow from the voltage source and the capacitor through the LED until the voltage drops again, and the cycle repeats.
Is this refered as the break down voltage?
@@franky2shoes714 no))) this is the voltage that destroys the transistor)
I can't get my head around what is happening. Anyone care to explain to humble me.
What can be the maximum frequency, cam it be used for rf applications
No, you can't use it for RF application. This is just for mere fun and education. As for the maximum frequency, it depends on the transistor switching speed and the components you use.
@@ArsyadKamili I think some people already made it in RF application, either for receiver or transmitter.
1:38 i guess the bigger one is the positive and the smaller one is the negative
Sir can this circuit be used to drive power mosfet?
Why is it not working in a circuit emulator?
Because this circuit uses a real-world behaviour of some certain transistor
Hey, can I use a zener diode instead of the transistor
Doesn't seem to be working for me. The LED is just dimly lit. Even a series inductor with the LED doesn't seem to be making a difference. Maybe I'll be able to pick up some tremors with the o-scope but certainly the effect is vastly diminished if at all present. Maybe someone else can build one and share working specs?
SashaXXY thanks. I am am a beginner, so I don't have an oscilloscope. Please check it in yours and reply.
@@srivatsajoshi4028
Try and use your computer sound card input as an oscilloscope..with caution though!
Number transistor..?
thanks 4 sharing this informative vid'.... just my opinion, but the music sound track is unnecessary and annoying
Yeah i think the 555 timer is a bit overrated
ingenioso!!
I don't understand why you would show how to build the circuit, the when you show it working it has two led's. Why ?
It doesn't matter how many LEDs you use as long as the power is sufficient.
But when they flash I can't tell if one is flashing or both. Why do you throw in this confusing element that has to be explained in reply to a comment ?
I don't need to RE-explain the video content in the comment to you if you understand the concept in the video which you don't. So, I re-explain it to you why I use two LEDs.
I was really hoping i did not hear the 12volts thing again.
I know, it's annoying that all these youtube video things run on 12 Volts!
@@murrrr8288 ironically i live on 12volts in an RV with solar panel.
great, this is transistor in avalanche mode.
Let me try first.
Dont build it . Transistor is broken after using
Can i get chema ?
I thought I had seen this format style before, but he was German. I mean good job but it's a rip off of the Greatscott! channel..
Hah...good.
bull dosent work on simulator wtf
Most simulators have not programmed a breakdown voltage for transistors.
I like this modest musical background.
//Since I cannot comment on the technical side
Are you Arsyad Kamili's relative?