Generate A PWM Signal using 555 Timer IC & A Potentiometer
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- เผยแพร่เมื่อ 18 มิ.ย. 2024
- In this video we’ll be generating a PWM signal using a 555 timer. I have a 555 timer here generating a square wave signal that I can control using a potentiometer to replicate a pulse width modulated signal. You can see as I change the value of this pot, the signal is changing from mostly off to mostly on and vice versa, and the led is getting brighter and dimmer. If you have no experience with the 555 timer, watch my last video, I went into a fair bit of detail of how it all works. This video will build off the back of that one.
Link to 555 Timers: amzn.to/3qFTWyZ
Previous Video: • 555 Timer For Beginner...
Timestamps
0:00 Intro
1:00 What is PWM?
4:19 Basic 555 Timer Schematic
5:05 Output Voltage & Capacitor Voltage
8:30 Replacing R2
10:25 Potentiometer Explanation
16:15 Charging Paths
17:30 Schematic
21:05 Demonstration
23:45 Buzzer
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Hi, I'm Hamed, an Electrical & Electronics Engineering Student in Leeds, UK. At the time of recording this video I am approaching my third and final year at university.
Visit my website at www.hamed.engineer
If you have any questions you can email me at hamed@hamed.engineer or just comment below.
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Please note that the voltage stays at 6 volts, you are just changing the total power delivered to the load.
Yes very true
@@HamedAdefuwa - great video (looking to create a pwm controller for fans) - but I think this is a really good point because it can be detrimental. For example, if you are powering a 3v LED and set PWM for 50%, you are still going to blow the LED because it will break as soon as it gets 3v. People need to understand that if your device can't take the full voltage, then PWM is not the solution. I doesn't not reduce the voltage.
absolute masterclass, as someone who wants to take EE more seriously u have just demistifed alot of stuff my brain couldnt wrap my head around. Thanks alot bro, you had an answer for everything i was wondering why the pot was even there, but when you brought forward the microcontroller example and using that to lower the pwm it all made sense. Again thanks alot g
You're most welcome bro ❤️
Can I use normal diodes instead of using small signal schottky diodes?
Any engineer is lazy.... It would be a problem if you aren't
😅 I was literally just looking at a book and wondering why I'm so lazy and can't be bothered to read it. Now I'm reading your comment lol thanks bro ❤️