EEVblog

[@deefdeefdeef]

I can't imagine why anybody would complain about a free education. Dave, keep up the good work. The vast majority of us appreciate your effort and understand your dedication to the craft. Keep 'em coming. I can't wait for anything else you have in store for us!

[@1234Tubie]

10 yrs later after watching a few clips and static explanations I was still confused at a - cycle instead of + to start with, then the C3 (the next cascaded stage). Then I came across your clip (subscribed) and assumed that it'd be confusing as well, but it was not. You did explain just enough and was on the right pace to understand the whole A to Z theory mathematically, Thank you!

[@hobby-ish]

Are you talking about the cap initial charge voltage in the villard doubler? Because if so, I was confused about the same thing. Open question to you and others to help my understanding: is it fair to say that we know the *direction* of the voltage across the cap when he says it's "already charged" is because the cap will only charge (i.e., the diode looks like a wire) when the source's top terminal is neg. w.r.t. the ground node?

[@jason54953]

Damn I wish you were around 10 years again when I started working on my electronic engineering degree. Those professors would just fly-by subjects. You explain everything with a purpose. Good job!

[@wb5rue]

I feel your pain! I must have had the same guy!

[@tanner1985]

I'm learning by now thanks to people like him. And I had a degree in electronics in 2003!

[@LynxBoiYiff]

A short-video Dave-Unit equals 25 "normal" Minutes. I like your videos very much.

[@EEVblog]

Lynx Boi Thanks!

[@lorasam9969]

Nice

[@1337NoMad1337]

No worries, please keep the "long" durations, if needed. You're educating people, take your time as needed. Really going into detail is what will make these videos successful. Keep up the good work, this is education for everybody.

[@keesreuzelaar3265]

Excellent video! Nice balance between theory on the whiteboard and actual building and measuring. I hope to see Fundamentals Friday becoming a regular feature. Love it!

[@sahilsharmadec25]

The only one video on KZbin that helps easily to understand voltage multipliers

[@alexb9039]

Thank you. Filled in all of the missing links in my head since teenage years on cascade multipliers.

[@iSolarSunrise]

Dave: "If I'm doing half-hour tutorials, I'm doing it wrong"... Me: *Looks at the video duration*

[@BanAlMandalawi]

same 😂jokes aside though I'd rather have a longer detailed tutorial than a chopped incomplete one

[@digital4282]

I find this method excellent. It's not much unlike being in a real classroom situation. I also like the way you built the circuit out, for me it's one thing to see the schematic, but it's another thing to actually SEE the circuit in actual usage. Thanks Dave!

[@johnopalko5223]

The most impressive Cockroft-Walton multiplier I ever saw was at Fermilab. They used it to ionize hydrogen and start the protons on their journey. The insulators were a couple meters long, at least. They used four accelerators in series back then: the C-W multiplier, a linac, the small booster ring, and then the main ring. That was almost forty years ago, so I don't know what they're using now. I imagine it's even bigger.

[@AakaashNarayanan]

Hi John, I am Aakaash and I am presently a postdoc at Fermilab working on accelerator physics. The Cockroft-Walton generator at Fermilab was decommissioned in 2012 (~11 years ago) and has been replaced with a newer more modern Radio-Frequenct Quadrupole (RFQ). I was pleasantly surprised to see Fermilab mentioned in the comments. The Lab is now much more complex and diverse in terms of beam lines and experiments on site. May I know how you got to know about Fermilab (and the CW generator in it)?

[@johnopalko5223]

@@AakaashNarayanan Hello, Aakaash. Thank you for the note. I was always a science geek and I loved driving around Fermilab, poking around in Wilson Hall, and taking pictures. (I would just wander in with no permission and no escort. That probably can't be done anymore.) My hobby was landscape and architectural photography and Fermilab had some wonderful buildings and sculptures. I was working as a programmer in a business setting and wanted to do something more scientific and creative with my skills. To that end, I submitted resumes to Fermilab and Bell Labs, both places I'd wanted to work since I was a teenager. I was invited to Fermilab for an interview and spent the entire day talking with people and being shown around. One of the first things they showed me was the Cockroft-Walton. If I remember correctly, my assignment would have been writing FORTRAN code to extract protons from the ring. Amazingly enough, I was offered a position at Fermilab! Almost simultaneously, I was offered a position at Bell. It was a difficult, agonizing decision but, ultimately, I decided to take the job at Bell Labs. In retrospect, it was probably the right decision, but I still feel wistful about Fermilab.

[@00Skyfox]

Please never feel you have to keep these videos short. You thoroughly explain everything and show many different examples of what-if. Since I'm just now getting to the first of this series, I hope they continue to be as in depth with the subjects!

[@stephenw3394]

Love watching these videos while drinking my morning coffee, always learn something new and interesting. I actually just got my first set of lab equipment (scope, meter, function gen, bench psu), can't wait to start building and testing the circuits in your videos! Keep up the awesome work!

[@supersat]

As a software guy who knows just enough electronics to get himself into trouble, I must say that I love the new segment! More fundamental Fridays!

[@nathanpc]

This should definitely become a regular show. It's always great to learn more!

[@ceeney6]

I cant understand why dave only has 915k subscribers. The amount of knowledge and support he has put out for electrical students or enthuisist is huge.

[@newfablesam]

If I ever have trouble grasping a concept in my classes I do a search to see if there's an EEVblog video on the subject. One of the best professors I've ever had! I'm surprised my college doesn't use your videos.

[@brentsinger1980]

Dave you are still best source on internet/youtube for professional info. Thanks again.

[@EEVblog]

A whole 5 minutes off 30 minutes! I want credit for that dammit :->

[@paramanandamp6513]

Kfkjfkyf

[@abhijithanilkumar4959]

All we can do is to say a Thank you from the bottom of our heart Dave

[@baburaospeaks2429]

Thanks for great explanation 👍 keep up the good work 👍

[@Allroadrunner]

finally I understood with this video!

[@MarkMcDaniel]

I'm fine with longer videos. I don't like abbreviated lessons.

[@stemben5287]

This video was a huge help when I reverse engineered a high voltage DC boost module and I even make mention of your video!

[@purza95]

Awesome video. Servicing Electron microscopes for a living I deal with this circuit variant a lot! 30 - 300 KV accelerating voltages, Photo-multiplier power supplies, etc. Anything over 10 KV are put in oil.

[@FaberMontis]

This is the better explanation I ever found about this circuit. I am preparing for a physics lab exam, and couldn't get a grasp of the functioning from the professor's lessons. This helped very much, thank you!

[@sallowsandy]

Absolutely adore this section, as welcomed with every other segment you provide for us to learn and hear from. Thank you. You explain it better than most, and I know it will get better as you go. Dave Rocks!

[@FrankenPC]

Finally...I understand how this multiplier can be applied. It's tough being an amateur and getting straight answers to these kinds of questions.

[@KurtMcScotsman]

Just watched this again to study for one of my ECE courses. You're better than most of my prof's, Dave!

[@dingiedong76]

You methode is just fine for me. Please do more Fundamentals Fridays Very nice addition of Teardown Thursday!

[@DaveCMechEng]

"Fundamentals Friday" is an excellent addition to your blog.

[@mmilner7666]

Two enthusiastic thumbs up for Fundamental Fridays. I wish all university professors could explain concepts with such clarity.

[@HighVoltageProjects]

THANK YOU SO MUCH !!!! This as all the rest is a great vid .I've always wondered how the last caps can takes so many volts ,and they don't .love your vids and have learnt so much so again Thank you

[@tanner1985]

Good observation!

[@utkarshsrivastava4106]

I'm your biggest fan mate ! Your concepts are super clear and i think your tutorials help me a lot., , ,Wayyyyy better than other tutorials out there. Thank you

[@Nevir]

These new theory/tutorial segments are great! As an engineer of a different speciality than electrical, I find that they help round-out my understanding of the challenges and nuances of the EE world quite nicely. Cheers!

[@JerryEricsson]

Bit old, but I love learning, and every time I find one of your videos, I do in fact learn A LOT!! thanks a million mate. I once had a very good friend in Vietnam, met him at the South East Asia Signal School, I happened to be attending the same course as he in the installation of the WACO 500 Dial phone on field wire, sort of a stupid course if you ask me, however it was a great break for me, and the course was over Christmas and New Years of 1970. (Got to see the Bob Hope SHOW!!) At any rate, we met at that course and became close friends. He was from your nation, we spent many hours after class soaking up beer and telling tales of our homelands. Although his name now escapes me, I shall always recall his face, and that Australian accent. Funny how men seem to bond when they serve together in a combat zone, even in the rear area such as Long Bien, the location of the course. For all of us attending from all over the country of South Vietnam, it was like a break in a safe area where we could relax and forget the war for a couple of weeks.

[@GhostOfJulesVerne]

Seeing the caps charge and discharge on the scope really helped me understand how this thing works. Thanks!

[@Vandwo]

Just love spending time in Dave's channel.

[@SteveMacAwesome]

I loved the circuit and pcb design videos - I think this is the best idea ever. Thanks Dave, your blog has turned my Electrical Engineering course from something that was hard, confusing and unpleasant into something that is fun, exciting, and intrinsically worth doing. In turn, that made my life a hell of a lot more fun. Thumbs up!

[@OneBiOzZ]

Yes please! more of these! i learned nothing new this time but you never know what interesting things you can learn!

[@rodneyb2640]

I agree with the apparent consensus, thumbs up. Releasing new offerings can be important for business growth, though finding them can be work. I think that Fundamentals Friday sounds like a good prospect.

[@k3ith1]

Excellent. From theory to the real circuit and the actual behaviors. This is why I started watching your blog Dave. I'm gonna go buy a shirt now... I've seen these circuits in small HeNe laser power supplys.

[@richardsandwell2285]

Very well explained. Such a useful video to describe such a great circuit..

[@CW_CW_CW_]

Dave you brought a completely new level of comprehension to what I already knew about the voltage multipliers!!! Well done! I LOVE this show! :-D

[@onwul]

Dave, thanks for the great video! Please continue making such videos. I assume, that most of the viewers here probably already doing CAD drawings of the circuits in their heads while sleeping, but there are still newbies left on this planet!

[@36trooper]

I like the length! These are non-trivial topics, and as a undergrad EE student I don't mind the length at all. I prefer you take your time and rant on about everything you'd like to talk about. I love the idea Dave. Thanks!

[@jsecret9459]

Dave you gotta be the only guy who I'll watch standing in front of a white board for 25:10. I'm liking Fundamental Fridays already!!!

[@ANDREYgrava21]

This is the kind of video I would like to see more on your channel. EDUCATIONAL & Fun.

[@bigheat86]

Great one. Love it. I didn't understand this chapter in the holy "arts of electronics" book, but you did the job. Thank you.

[@seinfan9]

This channel is the video form of art of electronics.

[@drakonzebra]

Wow, i've worked with this circuit block for a while now, even had it as a part of my uni project, but never fully understood how it worked. Thanks, Dave!

[@elephant7]

This is the kinda thing that I love to see keep it up Dave!

[@NumosG]

This is the kind of video I would like to see more on your channel. Educational and fun.

[@angrycatowner]

I really miss these fundamentals of EE videos. Please keep them coming!

[@rolfkopter2135]

Please continue this! I really enjoy your blog even though I'm just a beginner. Having a few more videos geared towards those who've just discovered electronics for themselves would be awesome!

[@Brendan77132]

Really like these fundamental videos,much better than the other tutorials I've seen, I just wish you did these when I was in my first year of college, it would of made life easier.

[@simonmaverick9201]

SUPERB. Thanks for making these circuits easier to understand.

[@Si1983h]

Brilliant explanation Dave, my electronics tutor didn't have the knack you have for explaining these principles.

[@iSolarSunrise]

I'm not saying that I hate long videos, I'm just commenting on what Dave had said... Anyway, his videos are always top-quality.

[@Slugsie1]

Excellent video. Even as someone who is an 'enthusiastic bystander' to EE it was understandable. More more more!

[@FirstName-14]

Great Info Dave! That's a circuit I never cam across during my College Course (Just about to grad with an Scottish HND) And this is the kind of infoVid that is just perfect for expanding my knowledge bank! Not to0 much info in the one go, and doesn't make assumptions about the viewers abilities, but encourages folks to go build it!!! Keep up the great work.

[@ixamraxi]

LOVE this segment, you should definitely keep this segment, and I love in depth tutorials so I dont mind 30m videos about fundamentals of electronics. Thanks Dave, keep up the great work!

[@502deth]

as you said in the beginning, the concept shouldnt take more than 10-15 min to explain, but the hands on measurements in on the actual circuit make the extra 10 min very worth it. actually seeing it helps. as usual with your vids, i knew most of this stuff before, but i UNDERSTAND it now. knowing how to hrow one together and the final effect on a circuit is no where near as useful as knowing how/why everything works together to get said results. keep up the great vids.

[@SHAUN0H]

To Dave (ex- Castle Hill resident Here. currently UK) Loved the Video. Just one little gripe you quickly glossed over the operation of the 'clamper' circuit as magic and this really threw me. i sat down and figured it out and found it's function quite interesting.. as in the Capacitor is charged to a positive level starting the negative AC input cycle with current flowing through the forward bias of the diode minus the diode voltage drop. then as the cycle reverses the voltages are added.

[@Razor2048]

Don't worry about making them shorter, your videos are very interesting to watch and and longer videos means more eevblog each week :)

[@TheJennetteFan]

KEEP THEM LONG YOUR TUTORIALS ARE THE BEST.

[@Ed19601]

Made a 2.5 kv multiplier once, fed directly from the grid. At the end a couple of megaohm resistors, leading to a blank needle. Worked perfect as air purifier, attracted lot of particles from the air

[@milanhlavacek6730]

Wow thank you for the air purifier can i ask? where was the second pole (aka ground) connected? , was there corona?, and can i know the value of the resistors? Im planning custom multiplier fed with 4(in series) mots and with custom made caps (15000v 1uf (lol im 14 from czech republic) ) to test dielectrics (and yes im hobbyist) thank you for making my tuesday lot brighter, have awesome day

[@Ed19601]

@@milanhlavacek6730 it has been a while (40 yrs) but I think ground was tied to a bottom plate. I seem to remember the '+' had 2 resistors of 2M2 in series, connecting it to a point needle. The entire contraption was encase in a piece of plastic pipe with the needle sticking out. What I do remember is that the top of the pipe and the wallpaper behind it became very filthy coz of all the particles that were apparently attracted. I think it was a design from elektor magazine

[@MrCareer707]

Enjoyed that video, keep them coming, I would watch it even if it was an hour long, good explanation and the circuit at the end was the icing on the cake.

[@viksohal]

Great Tutorial! This is the clearest example I have seen of this circuit.

[@gewtnet1]

Please keep this segment. I could definitely learn some things from it.

[@MrDubje]

Now that's awesome explanation! Wish we had this as theory in school! I predict that *everything* we used to learn in school is on the internet in a few years. Well, most of it is already. These video's make for a great addition to all that knowledge there is currently. Love it! Thumbs up for Fundamentals Friday!

[@danchadwick1495]

This work is fabulous thanks! The device is actually 8 stages with odd values on the top row 1,3,5&7, but it still opens my eyes to possibilities. Thanks!

[@danchadwick1495]

Watching again I stand corrected.

[@TheProCactus]

Seriously, This in my opinion is one of his best. I learned something from this one. Cheers Dave bd

[@thenerdyouknowabout]

10-15 mins...... 25 mins later. Not that I'm complaining!! Keep up the awesome work dave!

[@predonitraian6451]

Thank you! I appreciate your help!

[@chrisgreece52]

Thanks for the new lesson series Dave i am sure it WILL help many nerds to widden their horizons and learn some things about electronics!!!

[@PeteVanDemark]

Great video! Great explanation of the voltages and corresponding component requirements within each stage. Looking forward to more Fundamental Fridays! Keep up the good work!

[@ceecrb1]

Friday Fundamentals! THIS I like the idea of!! Dave is on to a good thing here, reminders of what the lecturers TRIED to force into my brain at uni is always a good thing!

[@whysguy3]

Love the new Fundamentals Friday Idea! I'll be a regular watcher. Looking forward to next week.

[@KX36]

I like the new segment. Been watching your vids since about #40 and IMHO too much time's probably spent on very high end test equipment. I think that's why the mailbag and teardown videos are so popular, to get some variety. It's all well and good having the scopes and meters and I'm sure your viewers are encouraged to spend possibly more than they need to on them, but then need something to do with them and if you can give them that, then it's great. Looking forward to the segment. Thumbs up.

[@QrchackOfficial]

Watched this again after several years, just realized this is how they do +/-12V for opamps and 5V for digital in Alesis gear (digital reverb effect boxes etc) - they use 9V AC in, multiply it for +/- 18V AC and then it's just 7812/7912/7805 for linear regulation. No need to worry too much about 18V dropping down because it's well above 12V. Neat! :)

[@mattperry6612]

love this, clearly explained. quality audio and visual. covering all the need to know aspects. Thankyou

[@soringabriel4062]

Don't worry about the length of the video 😉 it's just the right thing 👌 to explain everything accordingly so keep it up you're doing great 👍

[@rockflush]

The best explanation about CW Multiplier! Thanks!

[@SeanDuffyProductions]

Fantastic video Dave, you explained this so well that even with my basic physics/electronics knowledge I was able to understand these principles. You should definitely make this a regular feature!

[@McFlip211]

Do more fundamental fridays, love em!

[@nemanjatodorovic2803]

Thanks for this! The other day I was studying a scheme and I could not figure out how this works! I especially like the friday videos! :) Thank you again!

[@briantamburelli7573]

Dave I always give you a thumbs up 👍. I like the way you teach. I'm just learning. I watch a lot of U Tube videos. Your one of my favorites. I read a lot of electronics books and breadboard the projects in them as well ☺️.

[@eiler89]

Hi Dave! This segment is a winner! I really hope to see more of it =)

[@ISmellBurning]

Thanks very much Dave, I was happy with just the theory, but you went the full hog and built it up too.... Good job! Looking forward to the DC version.

[@jrallen870]

great video... and I love the idea of fundamentals Friday... much better than Mail bag Monday

[@snaprollinpitts]

what are you gonna do, you're covering a great deal of material! It doesn't matter to me how long it is, just that you are thorough. and you do that perfectly!!! thanks Dave for the great vids mike

[@RallyRat]

"Death, taxes, and diode losses..." LOL!

[@toast_recon]

Please do not keep it shorter next time! This video is perfect, and I'd love to see more simple but thorough explanation videos like this.

[@ForViewingOnly]

Dave, if you can hear me, this video was excellent, thank you! A Fundamentals Friday tutorial will balance the channel nicely, especially if it explains something discovered in a teardown (theory becomes 10 times more interesting after seeing the real life application!). Looking forward to the DC V multiplier next week. All the best.

[@metaforest]

I once modified a friends UK-only(240V) ghetto-blaster to run on USA power(120V) by re-working the bridge rectifier (off the secondary) using a full wave doubler into the main regulator(s). It mostly worked... but if the music was too bass heavy, and too loud, the system got a little noisy from voltage droop. Overall the hack was successful, but it might have been better if I had put the doubler on the primary... fun stuff! Thanks for the in depth coverage of voltage multipliers!

[@Detroit8V92tta]

Awesome, thanks Dave! Gunna have a crack at fixing the bug zapper!

[@GaryMcKinnonUFO]

"Death, taxes and diode-losses" :)

[@wb5rue]

love it!

[@iNowHateAtSigns]

If this were a t-shirt, I would wear it at every Hamfest I attended!

[@GaryMcKinnonUFO]

Good old Benjamin Franklin ;+}

[@johncoops6897]

Watching this again in April 2020.... wow, look at how good this channel USED to be!

[@MitchMed]

Man, this was really thorough thanks Dave!

[@wolfy9005]

1st bit: Used a random ceramic cap, a random diode, and hey presto 6.3V became about 11V AC. 2nd bit: 14.16VDC with the extra cap/diode to rectify it. For those who can't be bothered breadboarding it as you go :D

[@gamccoy]

Dave, you have a winner here. I like your theory videos best. Please, do more of these. I would like to see controller circuits like H-bridges or MOSFET switching. I would also like to see some FFT theory (watered down, of course) and even some tutorials on programming FPGAs -- maybe simulate a counter or something.

[@ShenLong991]

Hey Dave, nice new segment. like it, please keep it up, This Vid helps me a lot to understand how this Multiplier works, thankyou.

[@andresjaramillofigueroa3025]

"If im doing half hour tutorials i think im doing it wrong" *Does half hour tutorial*

[@tzq33tdq]

25 Minutes actually, so Dave is still safe XD

[@CMDRunematti]

@@tzq33tdq yeah, but he also made "80V DC" 😋

[@smilingbuddha2836]

@@CMDRunematti with 63V rated caps too.

[@altimmons]

Smiling Buddha yea but as he mentioned the local difference is still only 20 v. So within spec

[@Prometheus203]

Thanks for another enjoyable video, hope you cover other interesting circuits in the future.