DIY SYNTH VCF Part 2: Active Filters & Resonance

[@Money4Nothing]

Electrical Engineer here, I wish you existed back when I went to school lol. Great job.

[@iamsushi1056]

I'm learning more from this than my entire college course.

[@xasdrubalex]

cs engineer here, with a lot of EE courses, ffs this is the best content ever

[@AtlasMvm]

this channel is unreal. no fluff, all the necessary information, clear step by step diagrams, detailed explanations, BOM in description. thank you so much. Grüße aus Kalifornien!

[@chitlitlah]

I hadn't realized there was a BOM in the description until I read your comment. I think I have all the components already, but nevertheless that's some dedication by the author.

[@larrymorley8968]

Ich habe dieses und mehrere andere Videos gefunden, die Sie durch Glück erstellt haben, während ich auf KZbin stöberte. Ich habe Mitte der 1970er Jahre mit Elektronik angefangen, also habe ich eine sehr gemischte analoge und digitale Sichtweise. Schade für diejenigen, die jetzt anfangen, dass in den 80er und 90er Jahren viel nicht triviales analoges Wissen in ein schwarzes Loch gefallen ist. Danke, dass du geholfen hast, es zurückzubringen!

[@richardbrookesMA]

Never have i waited for a sequel this much before... Enlightened as usual.... Now impatient for part 3. Just brilliant.

[@UPCOWEBINARS]

me too,!!!

[@jcowe9194]

me too, this is the synth electronics I've always wanted!

[@warpigs330]

This is really tremendous. The step by step slow build up is really valuable. I got some chips a while ago that can be used for a VCF but the circuit was too complex for me to get working monolithically. I feel like I can get something simple working first, which is always useful. The fact you are using the most basic parts is really useful because I already have them. Talking about the little choices about clipping resonance, how the feedback path is through the capacitor, this stuff is really useful as I knew resonance was feedback and I could sometimes get my non oscillating filters to oscillate with feedback, but it didn't sound like resonance.

[@MoritzKlein0]

yeah, breaking stuff like this down to the bare essentials is really the way to go if you want to get anywhere with circuit design i think!

[@warpigs330]

I've been learning to test all my circuits individually before getting PCB's made. Sometimes I get too excited and hasty.

[@gustavosicaviani7553]

@@MoritzKlein0 life blesses you Moritz!

[@Afrotechmods]

You make very good tutorials.

[@MoritzKlein0]

right back at ya!

[@lilliampumpernickel9916]

MAKE MORE VIDEOS!!

[@wesleymays1931]

Where have you been the last three years?

[@jimmysyar889]

Hey!! One more to the list.

[@vijayramachandran2943]

@afrotechmods Why you not making any videos

[@JYelton]

Moritz, I just want to express my thanks for your clear explanation and diagrams. You are a true-born teacher! Thanks for doing this series, it neatly brings together my interests in electronics and synthesizers!

[@FreeCircuitLab]

You have awesome knowledge. Keep it up...

[@dusteye1616]

That sequence at the end sounds amazing!!!

[@JayJay-ki4mi]

Mate, this video and the last one has taught me so much in 1 hour. Lots of things clicked in my head and it just makes sense. Amazing work, and thank you so much.

[@CircularMirror7]

This is hands down one of my favorite electronic design series. Great work wish I had this starting out.

[@danielleohallisey4218]

I've been making audio circuits with op-amps for forty years now, and have never seen such a clear explanation of how they work. Thanks!

[@nietaki]

This is awesome! The theory explanations as they're needed, the incremental progress with the oscilloscope insights, the sound of the filter, everything. Thank you for demystifying analog synthesis for the uninitiated!

[@ethnopsyx]

YOU ARE GOD OF ELECTRONICS! Your videos are exactly what I was looking for. Thanks a lot!!!

[@Stelios.Posantzis]

This is one of the most intuitive explanations of electronics circuits I've come across so far - perfect for beginners, great for others wishing to review their understanding of fundamental circuits.

[@Chasing_Thoughts]

This is the informative and quality content I search for, I immediately subscribed!!!!🤪

[@Five2nd]

I can not possibly describe how happy I am to have found your channel. Amazing tutorials. I’ve been wading through electronics building tutorials and theory for years and for the first time I finally feel like I grasp it. Also It’s nice to learn from someone who clearly has an ear for a beautiful tone. I’m amazed at the beautiful sound of this filter. Going to become a patreon supporter now! Byeee

[@LouisSerieusement]

10:11 My god what the resonnance does to the waveform when we look at tit with an oscilloscope is so fascinating and beautiful. I always knew basic stuff like potentiometers beeing avriable resistors, what a diode is ect, but with your video I can finally understand basic synth electronic without asking too many questions to my engineer friend ! Cheers and love from France !

[@MoritzKlein0]

everyone loves looking at tit!

[@256k_]

I've watched so many tutorials about filter circuits and it's always been a bit confusing, but this is by far the most in depth simple and digestible explanation i've ever seen! so thank you so much. i can actually now design my own rather than just blindly follow a schematic!

[@manofguitar]

This is so good. Thank you for sharing your knowledge in such a clear fashion!

[@Syncopator]

Very nice. I was already familiar with all the principles here, but I've never seen as clear and concise a discussion of them. Even if just from the standpoint of op-amps which are a great building block for a LOT of analog electronics for any purpose. Great job!

[@marcusbennett6995]

Absolutely Amazing. Total respect for the simple way you explain something so complicated (for me anyway) and make it sound so simple. You are a genius.

[@soejrd24978]

I'd love if you included the "end"-schematic at the end of the video

[@MoritzKlein0]

noted for next episode!

[@MoritzKlein0]

maybe this will do for this episode: tinyurl.com/y4zjnhor

[@alvarobyrne]

@@MoritzKlein0 thanks for this

[@meretrix]

Another fabulous tutorial, I am SO pumped for Part 3 :D

[@AeDevices]

This video has brilliance all the way up.

[@HowlingUlf]

I want to like this video TWICE! It's the second video from Herr Klein I watch! Monster clear information! KZbin should bring back the ***** five star ratings for videos instead of a simple thumb up or down!

[@benjaminlehmann]

That was so cool. Thanks man.

[@annamoan2107]

Thank you so much for all the crystal clear explanations applied specifically to audio. Like after each one of your videos, so many thinks are so much clearer for me now !

[@DigitalStains]

Now I get it why it's called resonance. These videos are awesome, thank you

[@itsbruxyall]

i was hanging on every word, not wanting this video to end. This is SO helpful!

[@anothercouture]

Fantastic. I learned lots, really looking forward to leason 3.

[@omnaraiya]

Another stupendous explanation. Looking forward to the next installment!

[@hellcoreproductions]

This is great, made me dig into my component draw for the first time in a while!

[@thiagoennes]

Man, this series is great, please make another hundred videos like this one. I am a casper electronics orphan.

[@MoritzKlein0]

will do!

[@pauloh.siqueira6230]

Perfect!!! This is one of the best audio electronic tutorials!! Bravo!

[@snowvalleyrat]

Thanks to you, my dream of building a synth may come true now.

[@BorisGrishenco]

This is amazing tutorials on analog sound electronics. This reminds me to try finishing my DIY guitar pedal PCB schematic and launch it into production.

[@TheSPoS]

Some of the best content of its kind on KZbin.

[@kcbanner]

Thanks for the great visualization of resonance on the waveform, looking forward to more of your videos!

[@coreyfridinger8242]

Super as always! Looking forward to the next several episodes!!!

[@garywallace1938]

This series is brilliant, please please please keep it up. I've made the VCO on breadboard, just need to transfer it into stripboard. Then I will definitely be building this resonant filter!

[@wuukaa9079]

The way you share your knowledge is such pleasant! I hope you like making your videos cuz we do! Thank you

[@denniswaakopreijers115]

Great explanations @Moritz Klein! It makes me curious about building something myself!

[@forex922]

Appreciate all the time and effort put into making the videos. Good job.

[@d.j.peters]

I never clicked so fast on the subscribe button while watching a tutorial like video as before. Great job well done and greetings from Germany.

[@LM18]

Wunderbar erklärt Herr Klein! Vielen Dank dafür!

[@AndersWeijnitz]

Amazing explanation! Super clear breakdown of the different stages of the filter circuit! Thanks so much!

[@selectedacre]

Another great video. Really... Like, really for real. ;) I've been producing electronic music for 25+ years. Initially with hardware, and then computers. Additionally, some 20 years of DSP programming, especially filters. in more recent years, I decided to pursue the proper DIY electronics side of things. I say all this because, after so much exposure - learning and using filters as I have - this video provided one of the most amazing 'a-ha' moments that I've experienced. Your explanation / thorough discussion of resonance made it click in a way that has eluded me up until now. Thank you again for the time and effort you put in to producing the videos. Definitely time for me to become a proper patron - you've earned it x10000 imo

[@MoritzKlein0]

thanks, much appreciated!

[@travissutherland8502]

Best intuitive electronics lessons I have seen on YT, and I have seen many. You are niched into only synth nerds here. Clip out the pure electronics lessons and your following will be huge.

[@dfautomaton]

Your 11th video. Consistently great. May your subs and patreons grow as rapidly as our knowledge.

[@nickygrillet786]

Hi! I come across your videos a bit late, but wanted to thank you for them! You explain things that looked super complicated in such an understandable way! And it's absolutely on the topic wanted to learn things! Thank you so so much for that!

[@KNHSynths]

Well explained, clear, demos and schematics are placed where they are the most needed, that's what I call a good video! thanks!

[@musictreeproductions5994]

Loving this series 👏👏👏👏 your explanations are so clear and concise! In addition to seeing the final schematic, it would also be awesome to get a little closer look at exactly where you're hooking things up to the breadboard while you're doing it! Regardless, I'm forever grateful for your content and can't wait for the next video!!

[@AndreaLombardo-mo1mu]

Your videos are exceptionally good!!!

[@pakhacks7507]

All problem clear from watch your videos. Thanks sir

[@loukashareangas4420]

Hello and thanks for taking the time to explain these beautifully! Even for someone who knows their way around op-amps, this presentation style is still useful! Two additions if I may, I havent yet laid the circuit out on breadboard but from what I can see, I think that the stereo 100k pot should be of the logarithmic type and connected so that fully clockwise you get the lowest resistance. In that way you get a mostly linear sounding frequency response (our ear has a logarithmic response), with the highest Fc coming from the most clockwise pot position. Also adding a 680 Ohm resistor in series with each side of the potentiometer should limit the highest Fc to around 23kHz, maximising the usable range of the potentiometer's turn. These are just hunches at the moment, that I quickly scribbled on an excel sheet, I will test them out and report back. In any way, they are minor stuff and do not in any way take away from your tutorial!

[@EMAHGERD]

Endlich mal ne schöne, professionelle und keine nervige Umsetzung von nem DIY-Synth-Kanal. Weiter so, ich glaube du hast da ne gute Lücke gefunden;-)

[@kimmy_future4265]

These videos are great! thank you so much for them! puts so many different things together and in the context that i need.

[@DuckTronic]

Very very nice! Thank you Moritz!

[@eliskwire]

You explain things very well!

[@JDLesemajeste]

This is a great series, keep up the good work!

[@MDJ5]

Mr Klein you are a treasure.

[@mattwillis3219]

The best OP-AMP Tutorial on KZbin, Outstanding work Maritz!

[@fruitpowerofeden-2022]

beautifully explained. Thank you. More ideas to add to my synth project, while understanding what I'm doing and how it works. Thank you :)

[@pedromanzano5418]

Your have the best didactics for electronics that I have ever found. Thank you.

[@danielwalker5682]

Excellent. Beautifully clear.

[@peterzimon]

Incredibly well explained!

[@marcokalach]

Amazing. Thank you so much. I'm a dyier from hell and this video made a couple of things way clearer. Keep up the good work!

[@martinmartinmartin2996]

see 5:55 to 6:55 CORRECTION: the non-inverting amplifier GAIN is fixed at x1 The description of the output voltage increasing from 0 volts to +4volts reaching +4.99999 volts is a good way to describe the action of the non-inverting amplifier that happens very, VERY FAST.

[@ewencousin]

So grateful!! Thx for sharing your knowledge!

[@timonlehmann5179]

Thanks a lot! Can't wait the follow-up! :-)

[@Mr_ToR]

Thank you so much for these videos. You are the Ben Eater of synths :-)

[@wsshambaugh]

This is really fantastic! I had to rewatch a few parts to get it, but the build up piece-by-piece is really wonderful for understanding why everything is designed the way it is, and how it works together. I feel like I’m definitely learning something new! One point though, it’s not really clear to me why you want to clip the resonance feedback path with the diodes, besides it sounding better. All the other steps seemed pretty well motivated, but this seems like something you get to via trial and error? Perhaps I just can’t visualize how it affects the output. A look at the o-scope at the end would be great!

[@MoritzKlein0]

totally agree, the clipping diodes are something i threw in as a kind of bonus. think i'll do a more in-depth explanation next episode .. or maybe in a spin-off quick tip.

[@OMNI_INFINITY]

Thanks! What ground reference input are those 2 voltage inputs are based off of though? @@MoritzKlein0

[@Nervenkugel]

The greatest series !

[@urssounds]

Brilliant channel! So helpful!

[@oscarpastor4439]

Super master class. Thanks dude!!

[@cowpens6]

lovely op-amp lecture! I didn't even know what is the VCF though.

[@JapanoiseBreakfast]

I love this series!

[@KnightMirkoYo]

Damn this thing suddenly sounds amazing

[@g.d.8065]

A simple way to explain how a voltage divider works can be like this: When you apply a voltage across a resistance, the voltage drops in a smooth gradient across the resistor. One way to reason about this is that the same amount of current is flowing across the whole resistor, but the resistance gets smaller as you get closer to the opposite end (because there's less physical distance between the given point and the other end of the resistor). Therefore, in order for the same amount of current to flow through the whole resistor, the voltage at each point in the resistor has to be proportional to the resistance from that point to the opposite end. A voltage divider splits this up into two (or more) resistors of fixed value. An example is if you have two resistors in series with the same value, the voltage across each of them will be half the total voltage, as the current across each of them is equal to the current across the whole thing, but each resistance is half the total resistance. The value of each resistor can be varied to give different ratios for the output voltage. (the following is some elaboration that can be left out) If you have the bottom resistor connected to ground, the output will be equal to the input voltage multiplied by the ratio between the grounded resistor and the total resistance of the divider (assuming you don't have any load on the output). As an equation, this is V * R2/(R1 + R2), where R2 is the grounded resistor, and R1 is the upper resistor. An example is if you have two resistors in series with the same value, the voltage across each of them will be half the total voltage, as the current across each of them is equal to the current across the whole thing. A potentiometer is a fixed resistor that you touch with a movable conductive contact to access the different points on the voltage gradient across the resistor.

[@AntonTHPS]

Such a good channel! Keep it up!

[@kombizenon]

Your channel is pvre gold

[@simonburns1055]

You have great diagrams for explanation

[@MrFelipeX300]

Thanks a lot for this videos! mazing job and clear explanations

[@RetroPlus]

This stuff is super exciting, I want to try and do my own wacky audio experiments

[@bigblastbeats]

Very good explanations you are a great person

[@hadibq]

Sympa la qualité de réception . Même avec un peu plus de distortion je seraix content de ce montage. 👍 merci Bertrand 🙏

[@scottcampbell330]

really great stuff! I want to PCB this.

[@danieldeatcu5986]

Your video is very inspirational besides of its knowledge sharing feature! Thanks!😃

[@liamorourke9685]

Great tutorial... thanks

[@yumnirusyaidi5109]

love it, thanks for making this such of video

[@segfault-berlin]

Great video as always, but you might want to discuss the roll of phase shift on the resonance. (Also understanding phase shift is pretty important for feedback too :) )

[@stuartchapman5171]

I joined the party at VCF pt1, I don't use modular, but I do build and use FX units, along with passive matrix mixers. I really liked the explanation of AC coupling, simple as is everything else in this series. One issue I have when creating complex feedback loops with pedals on the matrix mixer, I occasionally get pot crackles which I'm lead to believe is DC getting into the circuit, it happens with some of my contact mic setups , other homemade kit and sometimes just with cheap guitar pedals. Will this fix it! I'm thinking adding a 1uf cap and 100k to each input and 1uf on each out put on the mixer and each of my homemade devices.

[@MoritzKlein0]

hmm not entirely sure. only thing i associate pot crackles with is oxidization. but adding ac coupling is never a bad idea!

[@cj-er4xr]

great explanation as allways! thx

[@OMNI_INFINITY]

*Thanks! There is a schematic for how that is at **23:34** before that korg mod? (Or a breadboard diagram or some way to replicate that?)*

[@martingerken7094]

Super Erklärung, jetzt ergibt vieles was ich gelesen habe mehr Sinn. Bitte danach VCAs 😁

[@dennisvervest]

very helpful, thank you!!!

[@knuteri3]

Great explanation!

[@3tmbn429]

Thank you upload

[@NicolasRomanokeyboarder]

your videos are great, i read somewhere if u substract a lowpassed waveform from the source waveform u get a hipass waveform, doing this is no problem to u i guess, keep doing videos man!!