Passive RC low pass filters

[VikasDanny]

you are awesome!!!!!!

[DoctorProfesor]

Thumbs up for the comment hahaha

[exscape]

Just wanted to say that your electronics videos are the most helpful I've seen anywhere! Thanks a lot for them, and please keep them coming!

[gevelegian]

I was just about to ask about how to cutoff the signal at an exact frequency range when you showed it wouldn't be possible, so the best method would be just to reduce the range, make it more precise?

[Afrotechmods]

@gevelegian if you chain several filters one after the other you can have a steeper rolloff slope. If you do this I strongly recommend using LTSpice to simulate everything.

[gevelegian]

So far, the songs you used are the Duke Nukem theme and Pendulum Slam... WIN!

[galinrizov]

BANGING explanation of RC low pass filters .......!!! Love it !!!

[rtzigga]

Thanks Afroman! it's great for a relative noob like me to have this stuff explained in plain english with just the right level of detail. Sometimes there is so much jargon in there it just doesn't go in. Cheers!

[bcsupport]

Does the values of the RC filter change when load is increased or descreased at the output ?

[Pedrojoca]

Awesome Video!

I LOLed at the soft low pass and high pass xD

[russ187vrag]

This post is fantastic! You are great at explaining technical material. Very clear. I wish there were more instructors like yourself teaching in Universities and Colleges

[Raidel007]

Thanks a lot for the videos, the have helped me a lot on my project

[letsgetverydrunk]

aaaahh, takes me back to highschool... Thanks for these vids man!!

[KROBT1968]

do you happen to have a PWM video?

[jesspar2]

Really good explanation!

[RavenRof]

perfect, im going to use this to filter my subwoofer and get nice bass

[Pro1RicoV]

Well, at least this professor does not have the Indian accent lol

[yellowmetalcyborg]

You've got good taste :)

Pendulum rules

[yellowmetalcyborg]

Pendulum. You've got good taste :)

[udiweizman]

Great Video, love it but where is your cat?

[Hreinn91]

Another science guy who listens to Pendulum, cool =)

[Demoman42]

Dnb yeah! :D



[0528203]

so if wanted to make a circuit to output the bass of 31hz i would need to do the calculation.... for resistor and capacitor any help?

[RGAF1987]

I'm going to blast the audio to this video on my rusty 1987 Buick, after I get one.

[avtarlover123]

someone get the broom my mind just got blown!!!

[Hazza619]

@Afrotechmods when working out the cut off, why is it 10x 10 to the power of 3 for resistance and 10 x 10 to the power of minus 9 for C?

[Afrotechmods]

@Hazza619 10 kiloohms and 10 nanofarads...

[steveBB30]

Great videos.

What would the effect be if diodes were used to send the current through different resistors depending on which way it was flowing? Looking for a simple circuit to "debounce" the fairly twitchy output from a comparator ( for any that don't know specialised op-amp that saturates with tiny differential input) so it won't drive a FET too fast. Thinking when the comparator's output is low it should be possible to discharge the cap fast.

[tshadowh]

where is the donate button? awesome, all i just wanted to know in my class and i didn't

[a2bcnd]

yo, i have made an LED light box that flashes in time with an audio source, and im planning to make it only flash to the bass. this circuit is exactly what i need, however im unsure how to wire it up. from my audio source i have 1 wire of audio ( guessing that would go to the +) and one ground wire (that would goto the negative?) this is then going into a TIP31 transistor, which still needs the ground and audio seperate...would this work :s only electronics ive ever done is at school with bulbs!

[minhajkhan100]

nice



[janesays177]

Dear God...props for using Slam as the song example.

[TheAlmightyRectitude]

This helped a lot in choosing resistors and capacitors, BUT...

I just don't get it - Incoming + firstly goes through Resistor and than splits - to speakers + and to capacitor. Than it goes throug capacitor where it is connected to Incoming - and goes stright to speakers - ?

*So resistor is in line and capacitor is switched parallel with speaker?

[sapperlott]

Dang - looks like the video is restricted because of the Pendulum song played in it. Can't watch it from Germany :(

[metelskiy]

very nice video, thanks

[Electricsrb]

Can I put a bunch of these high and low pass filters in paralel, connect them on a single audio source, and with linear pot's have a equalizer? Thanks!

[punkdane]

hey dude, how making a video tutorial about DIY inductors,, it could be a great help, and also add something about LC hi pass and low pass filters,, thanks,,,

[87zohaib]

awesome wish i can learn more from u....keep posting gr8 vids

[rvasquez6089]

dude your videos are awesome.

[judgenap]

Hi Afrotechmods, Thanks for the great videos. Q . you changed the PWM to a DC Voltage . what examples would you need this for?

[Afrotechmods]

@judgenap It's a cheap and easy way to get DAC functionality from a microcontroller

[Knightmetal]

Afro, you gotta be my teacher, man. Awesome video as usual.

[DJPhilTBCollins]

Maximum points for using classic winamp. :D

Thanks for the videos Afro, you rock.

[pavelsj]

heeey great video!! just a question, what´s the name of the first song?? XD sounds cool

[thewii552]

@pavelsj Slam by Pendulum

[pavelsj]

@thewii552 thanks!!,haha stupid me, is in the winamp main window display XD

[orbiter8]

Awesome Afrotech.. Thank you

[Peteworth]

phenomenal tutorial again!

[TheThievingBeggars]

Excellent as always, and always so practical!

[shodanxx]

wow this is an excellent primer on filters

it would be awesome if you had a follow up video on

how to make sharper filters

what is the importance of the phase shifting/frequency in a filter

and maybe the filtering effects of parasitic capacitance/inductance in a circuit ?

oh and maybe something about resonant and active filters ?

btw all that material is already explained in the open source ebook called

"Lesson in electric circuits" at ibiblio

it's a great source for producing these vids

[httpkiller]

I like cats and resistors *g*

[jomelmaldonado]

Excellent tutorial, keep up the good work.

[frecuenciajuaniyo]

excellent video about filters... thanks dude

[Intosia]

Always nice eventhough i know some of it :D Keep m comming

[ubuntututorials]

I'm doing these in Electronics at the moment. I already knew the basics, but thanks for the rest - keep the great videos up.

[MrNago]

Your vids are awesome!

Keep it up.

[up0]

Wow... another awesome tutorial... I've learned so much from watching these vids... It makes it so easy to understand the concept. 

[silverstream314]

Great as always! I've been waiting for you to make a filter video. Thanks!

[Desmaad]

Don't forget filters' use in subtractive audio synthesizers, i.e. the minimoog. Speaking of which, what're the equations for diode and transistor based filters?

[frank26080115]

Hey if I don't view this video at full screen, the capacitors in your diagrams are really hard to see. You should put a notice so people turn up the quality and size.

Great videos

[frank26080115]

@frank26080115

and use thicker lines in your diagrams

[Afrotechmods]

@frank26080115 You're right. The youtube compression has made them look all weird. In the original render the lines are much more clear. Oh well something for next time.

[darkstar744]

Haha same here, this is way more informative than my electronics class! xD haha Thanks!

[MrLiquimatter]

i learned more from this mans vids than i ever have in electronic classes.

[klint6448]

@MrLiquimatter

So do I. He is the men dude.

[klint6448]

Hi falks. I am wandering samething about the C. So, which type of capacitor does have to be? Electrolytic cor film polyester? Thanks for answers.

[soloartist232]

@MrLiquimatter i know right. those theory profs probably have never touched a circuit in their life. it's really hard to connect all that math to the real world without someone showing you how. this is why we need teachers to begin with. yet, they teach straight book theory shit that you can't figure out how to use. i can appreciate the necessity for theory, otherwise we'd just be technicians, but we really need the applied side in the engineering curriculum too.

[jeanious2009]

Good vids, keep it coming. I learn a lot from your vids.