Boss HM 2 Explained

Рет қаралды 17,573

3 жыл бұрын

Swedish Chainsaw Pcbs are available here:
www.diyguitarpedals.com.au/sho...
Build doc:
www.diyguitarpedals.com.au/sho...
Build Report:
• DBE Swedish Chainsaw H...
DBE Swedish Chainsaw Sound Demo:
• DBE Swedish Chainsaw S...
DBE Swedish Chainsaw / BOSS HM-2 Shootout by the folks at HM2 Cult
• DBE Swedish Chainsaw [...

Пікірлер: 107

@wampler_pedals 3 жыл бұрын

Ackkkkttuaaaallllyyyy.... just kidding! Great video, well done! 😊

@erikvincent5846 3 жыл бұрын

Thanks! I didn't want to get too far into the weeds as I usually end up doing.

@codyherring5889 3 жыл бұрын

The Deep Dive series is amazing! More Boss pedal variants would always be great. Possibly showing different buffers and topologies? Thanks for all the content!

@Just_DonovanJ 2 жыл бұрын

Ahhhhh the Boss Heavy Metal was my absolute fave back in the late 80s....

@alexanderfischer1293 3 жыл бұрын

Fantastic video! I loved watching it from beginning to end. For me, the most eye-opening part was that there's that double-hump with frequencies lying so close to each other. So far, I've just heard people talking about the "1k hump". I'd love seeing more of this.

@noisegrrrl 3 жыл бұрын

Love the series, Would love to see a video on buffered bypass and how they work, on Boss pedals for instance (as we don't see them most of the time in the schematics)

@hadleymanmusic 3 жыл бұрын

You opened my mind breakin this down.

@hadleymanmusic 3 жыл бұрын

Cool! Im on my third one and its THE MOST BEAT UP BATTLE WORN OF all 3 and any pedal ive owned. Never found a setting for lead I liked but bangin chords its awesome.

@HM2CULT 3 жыл бұрын

Great video Erik! The DBE Swedish Chainsaw is definitely one of the truest DIY PCBs available. Would like to see more of these "deep dive" videos. Cheers!

@erikvincent5846 3 жыл бұрын

I created a playlist with some of the other "Pedals Explained" here: kzfaq.info/sun/PLCzwfVTc1jWR8op4eNMrXzyGWwgaxlhs4 and will be definitely doing more.

@jrdoughty13 3 жыл бұрын

Thank you so much, Keep this up! I've been able to get SOOO MUCH out of this series. I was able to really understand what is going on in my fuzz pedal with LTSpice thanks to this and the first two LTSpice vids

@stax671 3 жыл бұрын

These videos are great. I'm trying to learn some electonics and understand how pedal circuits work so this is an amazing resource. Thanks.

@use0fweapons 3 жыл бұрын

Yes, absolutely love videos like these. Getting to see the pedals eq is exactly what im looking for, and would love to see that for more dirt style pedals. rat, big box rat, big muff(s),ds-1, etc, you name it.

@michiganderryan5293 3 жыл бұрын

Great series. I'm learning a ton. I've been wanting to learn about the Lich King and the Phase Lock, too. Thanks!

@erikvincent5846 3 жыл бұрын

I created a playlist with some of the other "Pedals Explained" here: kzfaq.info/sun/PLCzwfVTc1jWR8op4eNMrXzyGWwgaxlhs4 which does include one on the Lich King Chorus but haven't really did one on the Phase Lock other than how to match JFETs.

@AndrewWukusick Жыл бұрын

I'd love to see one of these videos showing the difference between the standard HM-2 vs the Custom mode on the HM-2W

@inyourhead53 3 жыл бұрын

As a musician & electrial eng. student i absolutely love this content :) keep it up!

@erikvincent5846 3 жыл бұрын

No worries. There will be more to come!

@bigradio9396 3 жыл бұрын

Erik, you are the king of the deep dives and we want more!!!! The simpler the circuit, the more critical the choice of components is, which is why getting a Fuzz right is more than just selecting five components from the bin. I would LOVE to see a video with a simple circuit, like a fuzz, where you swap out some of the components to give the circuit a different flavor, even if it's the same component with a different tolerance. That would help folk like me get a better feel for the relationships between components.

@erikvincent5846 3 жыл бұрын

Glad you like it! We kind of did this with the "Modifying the Big Muff" videos we did a little bit ago. We also hit a little bit on that with the NPN Piggybacking Video, where we adjust the gain of each silicon transistor by way of piggybacking.

@bigradio9396 3 жыл бұрын

@@erikvincent5846 I hung on every word! These are really awesome.

@voa.aquino 3 жыл бұрын

Excellent! Best channel about pedals circuitry!

@EDGARDOUX1701 3 жыл бұрын

Mind blowing! Would like to see the same but on a phaser, chorus or any modulation effect. You rule..keep going man.

@erikvincent5846 3 жыл бұрын

I created a playlist with some of the other "Pedals Explained" here: kzfaq.info/sun/PLCzwfVTc1jWR8op4eNMrXzyGWwgaxlhs4 which does include one on the Lich King Chorus

@spencersoodek 2 жыл бұрын

Thanks for the video dude! I'm working on a HM-2 emulation in MaxMSP right now and this was super helpful :)

@MrTheog1989 11 ай бұрын

Great video. I'm glad the algorithm sent me here! Looking forward to more deep dives

@miketharipr 3 жыл бұрын

This is incredible! Excellent upload... great channel!

@JulioNusdeoIII 3 жыл бұрын

I'm learning a lot with this, man! Greetings from Argentina. I'd love to see an harmonic percolator analysis, that'd be awesome. Cheers!!

@lordflatworm Жыл бұрын

These are great. Helping me learn a lot. Thanks!

@bobvines00 3 жыл бұрын

Thanks for a _very_ understandable explanation of this circuit!

@Yupppi 3 жыл бұрын

I'd totally totally watch lt spice tutorials for pedals or even amps... Tried making a fuzz face circuit in lt spice in the footprints of Brian Wampler and it worked but I didn't figure out how to get meaningful graphs out of it. But anyway, very nice video, would watch more.

@IAmKillEveryone 3 жыл бұрын

great vid. keep this series going.

@hybridmusclegarage4590 3 жыл бұрын

Great video and info!!

@bringrobieback 3 жыл бұрын

This video is excellent! Please make more deep dives on pedal schematics!

@tomblake3780 3 жыл бұрын

Thanks for these types of videos

@SS-mj2mq 2 жыл бұрын

Thank you so much for sharing. I enjoyed the engineering tutorial and schematic layout awesome! And also you did a great job explaining the schematic thank you for taking the time out of your day 🤗💯 great video 👏👏👏👏

@jasonc3a 3 жыл бұрын

Deep dives are awesome. Give me more.

@mpkozak65 3 жыл бұрын

Very well done!

@steveoc1857 3 жыл бұрын

Excellent work

@Andrewfendrew 2 жыл бұрын

Thanks for your job! It would be great to see the circuit analysis of boss ds2, boss bd2, boss od3 or any other distortion/overdrive without OpAmps in the schematic. Some say ds1 and ds2 are the same, but they are completly different inside.

@erikvincent5846 2 жыл бұрын

The Angry Orange is our DS-1 project, but the DS-1 did use an op-amp. The DS-2 was an all-discrete distortion pedal, using "discrete op-amps" in its circuit. I believe the OD-3 also had the 5218 op-amps in them as well.

@Tom577 3 жыл бұрын

Great video! I would be really interested in a circuit analysis of the Klon since it is quite a unique kind circuit.

@nimlhug138 3 жыл бұрын

Thanks for another great video

@ezequielacevedo770 3 жыл бұрын

really good explanation !!!

@Ignitoph 3 жыл бұрын

Love this videos! Deep dive into hm2!?... Boom! Thank you.

@sugameltpastriescoffee7186 3 жыл бұрын

Great walkthrough. Just wanna add one tweak to this, swapping out those crossover diodes for small LEDs gives warmer and large sound and less grainy, did that to my old Marshall solid state valve.

@erikvincent5846 3 жыл бұрын

Yeah, I want to do a video on just cross over distortion. There is a fella named Mark Hammer, whose a pretty big name in the pedal community, and I learned quite a bit from him on that particular subject.

@sunnohh 3 жыл бұрын

This is fantastic

@Boogiethrash 6 ай бұрын

Would a blown cap or resistor kill me LED? I tried several times to replace it(the LED) and nothing seems to work. Incredible video . Just learning this stuff. Im blown away. Excellent job!

@cranklabexplosion-labcentr8245 3 жыл бұрын

So it’s NOT made from sandpaper?

@erikvincent5846 3 жыл бұрын

or perhaps a bastard wood rasp?

@julius14 3 жыл бұрын

Very nice, I learned a lot, thanks! :)

@phildem414 3 жыл бұрын

May I suggest you a circuit? The Bixonic expandora II. The circuit implement some kind of gain expansion that is often overlooked. Most likely to try to get some touch sensitivity implemented, not obvious in the controls names.

@hadleymanmusic 3 жыл бұрын

Im guttin a sony walkman and a rca one an aiwa one and a gpx one. The sonys got a bias on it I think the rca has a bass boost( ill do it into a bass pedal) . Ive just got in a double enclosure. Its not too hard( search and discover) to remove the cassette mech from the electronics. Ive made one once from a cheap chinese dollar store walkman. Put it into a nutone intercom box ( the size of a pedal) with the speaker. It could plug in and turn on, with the output jack it disconnected the speaker for a pedal. I seriesed the channels . it could start out clean and go all the way up to fuzz. Tone volume balance

@dannap8831 Жыл бұрын

that was so cool to see.

@PraiseTheSaw 3 жыл бұрын

Nice!

@normanvename4404 Жыл бұрын

Great video. Thanx! Can you do a deep dive on a quality 3 knob noise gate for metal like the Zuul+? And are there any good replacements for the THAT4305 and 4301 IC chips that are essential for that gate? Most noise gates i encounter have some form of tone suck that makes them not even worth it imo, even the KMA Pylon does it.

@the_nondrive_side 3 жыл бұрын

I recently picked up an ELECA EUM3 a clone of one.. Also branded EKO EUM3 I pretty much just added it for that semi parametric mid and the distortion being able to be turned right off

@erikvincent5846 3 жыл бұрын

Someone else mentioned a similar mod in the comments with killing the distortion by adding a DPST or DPDT switch that makes or breaks the distortion circuit right after the input buffer and right after the hard clipping diodes. The EQ can always be broken up into its own gyrators, just like any gyrator based EQ (like our Rock Bottom, or the Boss GE-7), its just a matter of what frequencies and what Q's to use.

@the_nondrive_side 3 жыл бұрын

@@erikvincent5846 good idea. The unit I have will actually just turn the dial to Zero and no clipping... Even when fed with my Fuzz Face cranked out full saturation.. I actually use the distortion just off zero. $20 clone works better IMHO. Was looking at adding the pre shaping EQ bypass with a larger cap..

@hadleymanmusic 3 жыл бұрын

Oooo oooo ooo ooo ! I can change the clipping?

@Gryph_FX Жыл бұрын

What a good video friend, what program do you use to simulate the circuit?

@cicciothelynx 3 жыл бұрын

I liked very much this kind of videos. If I could express a wish, is it possible to see a Deep Dive about Boss FZ2 Hyper Fuzz, an other bad and angry stomp boxes?

@erikvincent5846 3 жыл бұрын

We will be releasing the "Meat Grinder" here soon, which is our take on the Univox Super Fuzz, which the FZ-2 is based on. Ours has a few extra changes to it, such as changing the tone-stack from a switch to a pot (and give it a sweep that actually makes sense) and an intensity to how hard it clips, making it less harsh, if you want it that way, or not, if you don't, making the pedal a bit more versatile. There will be a deep dive on that, as I want to cover the "octave fuzz" topology both these pedals are using and how it works.

@cicciothelynx 3 жыл бұрын

@@erikvincent5846 Oh, wow man! That's way more than I wished for: it's like xmas in spring :D

@cicciothelynx 3 жыл бұрын

@@erikvincent5846 I forgot to mention: "Meat Grinder" is a badass name!

@ricardadn 2 ай бұрын

Moltes grácies, es incrible la teva feina.

@clairecampbell8328 3 жыл бұрын

Great analysis! Those adds tho xD

@hadleymanmusic 3 жыл бұрын

It needs 3 gain stages

@aaaaaaaaaaaaaaaaaao 3 жыл бұрын

Could changing the value of C21 allow you to move that mid hump to a lower band of frequencies? i.e. get rid of a bit of that scoop.

@erikvincent5846 3 жыл бұрын

Yep, if you check out our video on how EQ pedals work, we go over populating gyrator circuits to target specific frequencies and Q values. All of that applies here too.

@hadleymanmusic 3 жыл бұрын

Can have a 3rd tone knob

@the_nondrive_side 3 жыл бұрын

Eleca EUM3 or EKO EUM3. Same circuit but separate knobs. Slightly wider range of distortion and sweep

@amorte666 3 жыл бұрын

awesome video man, I'm wondering if i wanted to do an EQ only mod using a DPDT where would it be the best place to put it? after c4 and after c14?

@erikvincent5846 3 жыл бұрын

That would work, if the goal is to bypass all the distortion and gain and just turn it into a 2-knob EQ pedal.

@the_nondrive_side 3 жыл бұрын

@@erikvincent5846 eko/ eleca EUM3 I have.. The distortion control will allow clean pass thru somehow if I just turn it down all the way.. Level unaffected. I wonder how much different the circuit actually is

@danielsaturnino5715 3 жыл бұрын

Looks like shifting the high-mid a bit towards the 700hz would make it more "linear" wouldnt it?

@erikvincent5846 3 жыл бұрын

It would help get it there, that's for sure.

@amorte666 3 жыл бұрын

some clones like the dunwich or the wurm have that option in the eq.... it isn't that useful tbh

@waldo13ification 3 жыл бұрын

Hi, great explanation, I you need inspiration could you look at the DOD metal FX70 in the same way please. Ive tried lots of distortion pedals and built a lot of pefals too, seeking the same response as the DOD, its my benchmark althogh the one I have is modded to tame the fizz as per Waplers book of instructions.

@erikvincent5846 3 жыл бұрын

I've not heard that pedal before. I've heard of the DOD FX70-C corrosion and looked at its schematic here: experimentalistsanonymous.com/diy/Schematics/Distortion%20Boost%20and%20Overdrive/DOD%20FX70-C%20Corrosion.gif, but that one seems different than the one you are speaking of.

@waldo13ification 3 жыл бұрын

@@erikvincent5846 Yes they must be similar pedals and I think the DOD Grunge is very similar too, It was the mod for the corrosion that I carried out on the Metal X FX70 and it instantly turned it into the best distortion I have ever played, a real singing distortion rather than just pulverised sound.

@denniskrigger 2 жыл бұрын

Would make sense to use ne5532 as opamps for this pedal? Looks like the original opamps were made to be used in portable tape/cd players and are more hifi than tl072 or jcr4558

@erikvincent5846 2 жыл бұрын

I did do a little personal shootout with the Mitsubishi opamps vs more common ones, including the NE5532s. The NE5532 wasn't as gainy, if I remember. However, I probably should do a short video on this, just as a demo.

@teoramusicschool 2 жыл бұрын

Hello, great job. What is the software you used for circuit simulation? Thanks...

@GeorgeGeorge-xj2bc 3 жыл бұрын

I am interesting buying pcb for this project and the delay pedal "boy in well".Can be shipped to Greece?

@erikvincent5846 3 жыл бұрын

Hi there, we do ship to Greece. The checkout will give you the options before you pay.

@lovecraftmusic8717 3 жыл бұрын

I need help with a noisy Ibanez cs9 chorus...should I look for capacitors or Op-amps? Which ones can cause distortion or noise issues in general?

@erikvincent5846 3 жыл бұрын

Capacitors can, as well as op amps. But analog chorus pedals also don't like hot pickups, so if that's the case, dial the volume down a bit and see if that helps.

@lovecraftmusic8717 3 жыл бұрын

@@erikvincent5846 hey, thanks for the reply. I don't use very high output pickups and this is the only chorus, among the many others I have, that has this problem. Here you can hear it by yourself. I've also messed with the internal trimpots but if the noise is gone, the chorus effect is gone as well. kzfaq.info/get/bejne/idV-mJl7l53NnKM.html

@erikvincent5846 3 жыл бұрын

@@lovecraftmusic8717 that sounds like the oscillator portion of the circuit, so that could be the op amp

@lovecraftmusic8717 3 жыл бұрын

@@erikvincent5846 hell, I just opened it up and discovered there are six!

@yurkshirelad 2 жыл бұрын

In the power supply section, why are Vin and +9V both shown?

@erikvincent5846 2 жыл бұрын

The "Vin" or voltage-in, is my actual voltage input connection, which would be a "9v supply". However, I have this going through a series Schottky diode for a little reverse polarity protection. This also results in a slight voltage drop. It's still "close to 9V", so I label it "9V".

@nuvaco5 3 жыл бұрын

top top :)

@stax671 3 жыл бұрын

Hi Erik, What's the software you use for the schematics? Thanks.

@erikvincent5846 3 жыл бұрын

EAGLE CAD. Or LTSpice

@stax671 3 жыл бұрын

@@erikvincent5846 Thanks.

@micahj9828 3 жыл бұрын

You didn't go into why the gain control has a dead spot in the middle.

@amorte666 3 жыл бұрын

as far as i know is because the pot used is to high, so most of the range from 3 to 9 o clock is mostly the same

@erikvincent5846 3 жыл бұрын

@@amorte666 You are correct. I was going to go over this in LTSpice but was trying to keep the video under 20 minutes so that the KZfaq algorithm didn't vomit all over it. I'll probably revisit it when I eventually do the Colorsound OverDriver, which has a really notorious gain pot where, in my opinion, only 9 and-a-half o'clock and 10 are usable and the rest doesn't do much for me.