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RC Low Pass Filter Explained (with Speaker Example)

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In this video, I go over the concept of RC low pass filters. This includes the theory as well as the application. I go through the basic RC low pass filter circuit design, and go into detail about the components such as the capacitor and the resistor. I put the theory to the test by wiring up the filter to a speaker and an audio source. Hopefully, you have enjoyed the video! If you enjoy these types of videos then let me know! There is also more engineering videos on my channel already, so be sure to check those out too! :)
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"Sneaky Snitch" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
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Опубликовано:

5 сен 2024

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Комментарии : 64

@caderatcliff6884 4 года назад

Thank you so much man. I spent a long time trying to get a visual understanding of how an RC LPF worked, and this cleared it up immediately. Really appreciate it.

@Alex-vi5kp 4 года назад

Glad it helped!

@morgenfeldhahn532 4 года назад

Thank you this is so helpful! I've been looking everywhere but couldn't find a straightforward explanation of what is actually going on at each step. This was so clear and made so much sense

@Alex-vi5kp 4 года назад

I’m glad to help! Thanks for the nice comment!

@kaneater1 3 года назад

Nice Alex... I really liked your way of explanation and representation

@Alex-vi5kp 3 года назад

Thanks I’m glad it helped!

@omarceentayyab 4 года назад

@4:05 Thanks for that! Dudee! great video!

@Alex-vi5kp 4 года назад

Thank you!

@Nikhilkunjathaya 3 года назад

I can understand that there was demonstration mistake But the explanation was really cool for explaining "what if I do like this" solved my doubts. You recieved a sub 💙

@Alex-vi5kp 3 года назад

Thank you! I’m glad I can help you out! 😀

@evanjalinmarshal4919 3 года назад

Tq so much sir....this vedio helped me a lot to understand this concept..... to the point explantion without any stories

@Alex-vi5kp 3 года назад

No problem

@octarapribadi 4 года назад

Very great explanation.

@Alex-vi5kp 4 года назад

Thanks!

@jlev505 4 года назад

Intro is the best ever! Great video. Keep it up.

@dont.ripfuller6587 3 года назад

Oh cool, black magic , thanks for sharing

@Alex-vi5kp 3 года назад

wooo

@basselkordy8223 4 года назад

Great explanation

@Alex-vi5kp 4 года назад

thanks! glad i can help ya out!!

@khanoffirrhaman3107 2 года назад

Very good explanation, thanks

@williamnichols2067 Год назад

I built a simple double filter. With two pots @ 50Kohm and two 47Mfd caps in both the lpf and hpf configs. I have a line level output from whatever going into that, then going to a vacuum tube amp that I also built for the mids/highs from the hpf. Then the other to a powered ss subwoofer. Its mono with the stereo channels together. I can tweak how much treble and bass gets split. The tube amp is just a small 6at6 and 6v6 mono amp. Im impressed! Someday ill build a stereo version of this in a proper cabinet. Or if I'm really brave, a push pull stereo amp.

@seshachary5580 Год назад

VERY EDUCATIVE. THANK YOU REGARDS

@saftigesfruchtchen456 3 года назад

thank you

@Alex-vi5kp 3 года назад

Welcome!

@basserex4991 22 дня назад

Hello! i have this problem in my car audio. This ripple current is going to my only one amp (7200watts), how to solve this problem? thanks!

@charlesmills4029 2 года назад

Great video Alex, I learned a lot.

@rawankhalaf8826 3 года назад

Amazing explanation.. Thanks :)

@Alex-vi5kp 3 года назад

Glad to help!

@tylergreen712 5 лет назад

one thing that also confuses me...the node you speak of. is it an electrical component? does current just not go to the capacitor at all? what happens right there? I read path of least resistance is a myth. This is still by far the best explanation on youtube

@Alex-vi5kp 5 лет назад

The node is just the conection to the capacitor and resistor by a wire. Current does alternate in the capacitor since we have an A.C. voltage. You can think of the capacitor charging and discharging at the frequency of the voltage input. When it comes to A.C. circuits it's difficult to understand what is going on at a fundamental level. On a high level you can say, "oh, I see a resistor and capacitor; it might be filtering something." But if you want to know details, then in my opinion the best way is by doing the math, which requires good understanding of imaginary numbers or complex analysis. When it comes to electrical circuits, a lot of the times we only care about what goes in and what goes out. And once we have what we need, then we put in the missing pieces such as a capacitor and a resistor to get the desired output. I don't know you're level of understanding, but I recommend the book called The Art of Electronics. It covers a lot of theory as well as application.

@rzrw5632 4 года назад

I agree!

@annyan904 6 лет назад

nice explaination

@Alex-vi5kp 6 лет назад

Thanks!

@Alex-vi5kp 6 лет назад

Yeah, there is an error in this video when it comes to the speaker demonstration. The RC filter is preassumed that there is no load at the output. So when I hooked up the 8 ohm speaker, that is a low impedance device, so it would have affected the cutoff frequency. What I should have done was put a buffer (op amp or voltage follower) between the filter and speaker to get that high impedance that the model shows. The theory is correct; the application is wrong. I'm also dumb.

@88s10Durango 6 лет назад

Okay so I just bought resistors and capaxitors for a RC low pass filter calculator online ,, small 30 watt mono class d amp , want filter to go between amp and sub , using a 1.8K resister and a 270nF capacitor in parallel out to a 4 ohm sub ,, says it should cut off around 326 Hz. and I gonna have problems now ? thanks Bill

@Sergio-ta3krt 3 месяца назад

Thanks for the video! I will try this to dimminish that 1.5khz (i guess) noise of my arduino walkie talkie. When I TX, that noise occurs:(

@AsyncVoid Год назад

I really hoped you'd get into why you can't just use an inductor and capacitor

@rzrw5632 4 года назад

Thank you alot!!!!!!!!!!!!!!

@Alex-vi5kp 4 года назад

Glad to help!

@LogicEscapesME Год назад

I'm just wondering, without the breadboard, how to I implement this? I have an 8" sub with a dead amp, but have it running off the rear surround channels. Just want to drop it to 850hz. cut out most the vocals. SO, I thought it would be best to inline the resistor on the +. Then just bridge the + and - on the speaker itself, with the capacitor.

@tamanampudiamarsainathredd6856 2 года назад

Thanks for this Video. Can you provide me the software which you are using to drive the sound and info related to that?

@ophello 3 года назад

It really would have been more helpful if you used a white noise signal to test rather than a sinusoidal wave.

@Alex-vi5kp 3 года назад

good point

@redsusoverparadise2700 4 года назад

x is Z aka impedance

@mufflerbearingR32 4 года назад

What size of resistor would i use if i wanted to make a low watt sub woofer? Could you lay out the wire diagram on how that would look?Asking for a friend. :)

@amin125ccm 3 года назад

Do i put rc filter on output of amplifier or input ?Thanks,great video.

@Alex-vi5kp 3 года назад

Output. From the applications I’ve seen, you always amplify the signal first and then filter.

@amin125ccm 3 года назад

@@Alex-vi5kp Thanks alex.

@on1ytheb3st 2 года назад

Should the impedance rating of the speaker driver be taken into consideration with the frequency cutoff calculations? Does the speaker’s impedance become the resistor?

@chassenk412 Год назад

Yes it does, and it will change the R value in the 1/(2piRC) formula.

@oldguyjammin9732 5 лет назад

I have an Egnater tube amp for guitars that is a little Bass Weak. It has a 3 band EQ but even with the bass cranked it’s weak. I thought I might get in there an change out the capacitor in the bass EQ section for one that is double in value... is that right? Or should it be halved :)