A DIY Custom Band EQ Pedal - DBE Rock Bottom

Get your rock bottom PCBS here: www.diyguitarpe...

[@somedude5414]

EQ charts are just what I need. Perfect. Thank you.

[@erikvincent5846]

No worries. Glad I can help

[@Gearjunkie35JasonBallou]

2 years and no one noticed the Valvestate preamp seems to have been based on the Mesa....I've had a few and love my AVT150...going to put an EQ in the loop and go nuts tonight...thanks for all you work.. curiosity..and passion for the tone and parts that make the tones. Love your channel. Cheers from Wisconsin, US.

[@RobMods]

Thanks for a great project. This would make a nice little bass preamp. Perhaps a bigger input cap, and maybe use the spare opamp as gain or a DI trans buffer. So many players are going direct at gigs these days. For choosing EQ points, I usually shortcut the process by using a DAW to find the freqs and Qs I need. Saves a bit of breadboard time. Loving your channel!

[@ondooga]

Great looking project Paul & Eric! Having the ability to fine tune the EQ frequencies, will appeal to a lot of builders. Keep up the great work!!

[@cdburgess75]

That is so awesome, brilliant. The can doesn’t look too bad squished up. Has some character. You did parallel park!

[@Fireman9143]

Thank you for this! I've spent days looking for a way to build a specific EQ and youtube finally brought me here. Excellent content, and thank you for the store too!

[@cdburgess75]

Sincerely, completely adjustable. I’m going to have to listen more carefully to my time and try this one. Very cool

[@radhockenheim]

Hello, I have a spare boss style enclosure with a terrible overdrive (90s Ukrainian Boss copy) and I will use that enclosure for the EQ pedal. Greetings from Ukraine❤

[@paigdyll]

Can you do a video on a "q" toggle on each frequency for up to three frequencies to select

[@tybowesformerlygoat-x7760]

G'day. I'm planning to modify this design to be a 3 band (maybe shelving top and bottom - not sure yet..). I think I can work out the filtering stuff. But, is there a good 3 band version already? Thanks, and thank you for all the great info you're sharing here on the channel. Ty (Lismore NSW)

[@randallclemons8638]

I wish I could post a pic here becuase I have a question. I have a boom box here from the 1980s, one with two tape decks and a million settings and options. It's got mono jack inputs I can repurpose and I'm fairly sure I can use a lot of the electronic components, resistors, capacitors, transistors. When I bored I I take stuff like that out of things and thow it in a box in case I want to make a trebel bleed circuit or need something. Anyway, on the front of this beast is the prettiest square little 5 band eq with sliders you ever saw. Lol and I can just hear it begging me to use it for something. I was wondering if I could use it to make and EQ pedal. I mean, i could probably run a guitar through it as it is and use it. But I was wondering how possible it woudl be just to take out the parts I wanted and put them together in a box? I know you cant really answer this question without seeing it, but I'm going go ask it anyway. Which was why and how I found your video. I guess I wanted to find out before I tore it down and took the parts I know I would need. It has several pots in it also. I'm going to look at your guide, and I know I'll need a casing. Thats no problem. The only thing I dont have and may need is a PCB board. But the board may already be set up for this eq and all I will need is a foot switch. Take out the Jack's and the eq, wore them up in a box with a power jack. Wire in the footswitch and go to town,so to speak. Im not new to electronics but I'm no expert either and I've never biult an effects pedal of any kind. And if I'm going to try, I at least want to biuld something I need. It's about the right size and everything.Anyway, I've asked my question I know you csnt answer without seeing. Lol, I'm probably going to cannibalize it either way.

[@ryanbird109]

what is the formula for working out what capacitor/resistors i need for a chosen frequency? Specifically I'd like 40Hz, 160Hz, 650Hz, 2.5KHz and 40KHz (maag eq air band style)

[@erikvincent5846]

The build doc should cover that. www.diyguitarpedals.com.au/shop/boms/Rock%20Bottom%20EQ.pdf Pages 22 and 23.

[@tybowesformerlygoat-x7760]

Glad to have found you. Where are you in Australia? (I'm near Byron.)

[@sonicpickups]

Try spaying a couple coats of clear acrylic lacquer on those thermal labels before epoxying. Dust the first layer, let dry for twenty minutes and do a second heavier coat, maybe two. Let it dry for eight hours. Should keep the print intact.

[@notehappy2153]

Great stuff - a thumbs up from me! About the volume control; did I miss something or does the volume (as on the video) have to be on full on to match the bypassed level? If so, you can’t make any level boost? Because the pedal seems to work very well, with a build (or two) you could distill a different flavour from the amp with one, and have another pedal with its own charasteristics AND level for solos.

[@Dodovoodoo9]

waiting for same answer!

[@erikvincent5846]

It does have a bit of a boost due to the input buffer (www.diyguitarpedals.com.au/shop/boms/Rock%20Bottom%20EQ.pdf page 20)

[@erikvincent5846]

@@Dodovoodoo9 It does have a bit of a boost due to the input buffer (www.diyguitarpedals.com.au/shop/boms/Rock%20Bottom%20EQ.pdf page 20)

[@toneconsultant]

I just purchased it. Thanks!

[@astorina]

Hello, can i buy the full kit from you (components, box etc) or just the pcb as this seems to be the case on your web site ? I cannot find more than the pcb Great idea and very interesting videos Brgds

[@agentefarah2192]

There's some time I'm looking for information on the eletronic parts of a loop station/looper pedal, and I don't find it anywhere, there's any reason for it?

[@erikvincent5846]

The largest problems with those style of pedals is firstly, it will be digital, and secondly, because it is digital, how is someone going to implement it. There are some chips, similar to the PT2399, that are just built to "record" about 30 seconds to a couple minutes of material, but at an extremely poor sample rate (old telephone quality), but are easy to implement from a DIY standpoint because they are through-hole and require no programming knowledge. Then there are chips, usually microcontrollers and FPGAs that have tons of RAM built into them, so they can handle recording lots of audio, but then require high-quality DACs and so on to implement. Most of them are also surface mount style parts, like quad-flat-packs. To hand solder these are not for the faint hearted, and require a lot of programming knowledge to boot.

[@ejnordberg]

Do you have any plans to restock the pcb?

[@mrdeer5585]

Different question. Why is there no much parametric eq pedal out there?

[@erikvincent5846]

Depending on how many things to EQ, size will become an issue due to one needing knobs for gain, frequency and bandwidth/Q for every filter you wish to add to the pedal. So, if you wish to have 3 filters, you need 9 knobs. Not a terrible problem with SMD components, but if made as a through-hole project, that's going to get cramped.

[@sevenity2677]

I have a question on pedals. Where can I email you?

[@erikvincent5846]

www.diyguitarpedals.com.au/shop/index.php?main_page=contact_us

[@tomfoolery2082]

Choosing the freqs each person wants to use . Tht b great . How wd ya find out what would b best for ya ?

[@erikvincent5846]

That's typically a "by ear" answer. However a good starting point is looking at generic bands for your instrument. What frequencies you like and which ones you loathe. You'll want both on your pedal so you can boost the ones you like and cut the ones you don't like. Sometimes it isn't intuitive. Like on a bass guitar, you typically want to boost 1kHz, as that is the "bright" frequencies of a bass (good for slap/pop and accenting attack). 1kHz instinctually seems way up there for a bass, but that's what it is...ish. But, if you want a quick glance to get an idea of what to look at: blog.sonicbids.com/the-ultimate-eq-cheat-sheet-for-every-common-instrument

[@tomfoolery2082]

Thx

[@markdancer3501]

Can you easily connect two of these PCB to provide a 10 band EQ?

[@erikvincent5846]

Depends on your definition of "Easily". Looking at it, you'd make one board as-is. The second board you would need to provide it 9V and GND, and not populate C1, C2, C3, C14, C15, R4, R6, C14, R18, R19, and U4. You will still need U1, as it is shared for one of the bands. This breaks the input and output op amps out of the second PCB, which we wouldn't want. Then you would have to run a pair of wires from one board to the other, one connecting the Boost rails together and the other connecting the Cut rails together. Theoretically, that should work because all you are essentially doing is tying more gyrators into your boost and cut rails and providing power and bias. If you try this and are successful, let me know. I may make a Rev B of that PCB that just adds tabs or vias that can be used to make that process easier.

[@Francisco17Berrios]

@@erikvincent5846 Hey Erik can I ask you something? Do you know what the input buffer/boost and output buffer does? Can I remove both if I only want to use the eq pedal in the fx loop or line out of a guitar modeler (to shape the eq going to FOH)?

[@erikvincent5846]

@@Francisco17Berrios Well, the input buffer portion is needed to make sure that there is a "predictable level" of impedance going into the gyrator EQ section. Otherwise the gyrators don't work as expected. The output buffer is mandatory as that is also the summing circuit where the differences in the gyrator EQ circuits are put back together. So to imagine that, each gyrator EQ circuit will work independently, and virtually create a "separate waveform" per each gyrator circuit you put on the boost/cut rails. However, at the end of all of your gyrators, you need something to put them all back together into a single output waveform, and that output buffer is doing that function via it's feedback line.

[@Francisco17Berrios]

@@erikvincent5846 Thank you so much man!!!

[@erikvincent5846]

@@Francisco17Berrios No prob.

[@The-Trivela]

10:13 name of that song?

[@TuxWing]

Not being a someone that knows much about electronics like this, how hard would it be to merge/combine this or any of your other pedals with something like this DIY amp? kzbin.info/www/bejne/fWa3f6xpebyJaqM

[@erikvincent5846]

Not terribly too hard. Just find an enclosure big enough for both of them.

[@jeffallen3382]

Sorry but that sounds like garbage!

[@Ten2More]

I’d love to hear the EQ pedal you designed to rate your criticism.

[@jeffallen3382]

@@Ten2More how about you #gfy

[@jeffallen3382]

@@Ten2More how about you #gfywithasharpstick

[@tubeDude48]

Sounds like *CRAP* !!!

[@erikvincent5846]

tough crowd