[ORDER] 808 kick drum PCBs

bananeurysm · Post by **bananeurysm** » Thu Mar 01, 2012 2:57 pm

EDIT 1.10.2017
Revisions on new board:
- Euro and motm power footprints
- Pull-up for the accent control to make it easier to tie high
- Slightly (but not by much) larger board
- Improved footprints for easier soldering
- Removed redundant pot connections
- Better labeling
This is now listed on tindie.

EDIT 4.10.2013 - From now on I am taking all orders through tindie:
https://www.tindie.com/shops/jmej/808-k ... clone-pcb/

Stock list is kept up to date on that site!

The PMs are a little much for me to keep up with - so an integrated ordering system makes it all much easier!

Please note that I am now charging $2usd for shipping anywhere in the world. Shipping rates went up and at the same time my post office started following the rules more often and charging me (the correct) rate. Ha.

Hey guys - I haven't posted for awhile, because trolling too much makes my backlog grow too fast. BUT- I have something some of you might want in your own personal backlogs.

I have about 40 pcbs of the final rev of my 808 kickdrum layout. It's basically the Roland circuit, with some minor changes to the trigger input (based on Eric Archer's website), and with the common mods incorporated. (A frequency pot, and the optional decay mod via a resistor value change)

I don't have the BOM online yet - but I'll throw it on my website soon, along with build notes. It's an easy/quick build, nice small pcb.

This is the first PCB I've offered, but it's been tested by a bunch of folks with lots of happy kickin finished projects out there. It's a double sided, very high quality board - fabbed in the US.

I'm selling them for $25 + $2 shipping anywhere in the world

AND you can see from my pics that I have a solid test bed for comparisons.

It sounds legit and awesome.

NS4W · Post by **NS4W** » Thu Mar 01, 2012 3:07 pm

... but where's the audio demo?!

is cv for frequency an easy mod to this design? a tuned/playable 808 kick would be nice.

revtor · Post by **revtor** » Thu Mar 01, 2012 3:10 pm

any crazy obscure old components needed??

mome rath · Post by **mome rath** » Thu Mar 01, 2012 3:34 pm

revtor wrote:any crazy obscure old components needed??

doesn't look like it

bananeurysm · Post by **bananeurysm** » Thu Mar 01, 2012 4:02 pm

You can use obscure transistors if you want.. but my bom and board indicate substitutions - and it absolutely sounds like my real 808. I should post up audio samples.. you're right. I'll get to that soon!

Adding a vactrol to control the frequency pot with CV would be trivial.. though I haven't done it. I DO however have some tiny vactrol pcbs I should maybe do a run of.

mome rath · Post by **mome rath** » Thu Mar 01, 2012 4:03 pm

interested in this but $25 is too rich for me

Barcode · Post by **Barcode** » Thu Mar 01, 2012 4:21 pm

Edit: After looking over it again.... I want one.

obscurerobot · Post by **obscurerobot** » Thu Mar 01, 2012 4:28 pm

What kind of power does it want? +9V?

negativspace · Post by **negativspace** » Thu Mar 01, 2012 4:43 pm

bananeurysm wrote: I'm selling them for $25 shipped. I know I can include shipping within the USA for that.. I've never shipped PCBs abroad, but I guess depending on the country and the cost - I can hope to include shipping in that price as well... but otherwise I'll let you know after investigating.

Two things:

1) I want one!

2) International shipping on something like a PCB or two is almost totally painless. I've just sent about 200 boards, many of them overseas this last week - I use a 6"x9" padded envelope and I tape the PCBs to a piece of scrap cardboard which I salvage from old boxes, for rigidity. It comes to about $3/ea at the post office using first-class airmail.

keninverse · Post by **keninverse** » Thu Mar 01, 2012 5:03 pm

I'll take one.

Pfurmel · Post by **Pfurmel** » Thu Mar 01, 2012 5:08 pm

If you can manage postage to Ireland, I'll buy one.

darenager · Post by **darenager** » Thu Mar 01, 2012 5:12 pm

What are the power requirements for this? Looks like single supply? If so I'll take one, any plans to do the others? (snare, clap, hats etc?)

ringstone · Post by **ringstone** » Thu Mar 01, 2012 5:16 pm

bananeurysm wrote:You can use obscure transistors if you want.. but my bom and board indicate substitutions - and it absolutely sounds like my real 808. I should post up audio samples.. you're right. I'll get to that soon!

Should be fine with substitutions as the components Roland used in the TR-808 (such as 2SC945, 2SA733, 4558) are all "general purpose" parts (although there are a couple of exceptions).

That said, the 808 BD will only require these afore-mentioned parts apart from caps and resistors, and they are quite readily available still. Although some sellers may sell you variants (such as KSC945) which are similar but have a different pinout.

And yes, it would be quite easy to mod this board to do the usual 808 BD mods (such as pitch mod) as they are generally only resistor substitutions.

bananeurysm: Thanks for making this available. Might pick up a couple myself, will make the doing the next couple of 808 BDs a bit easier!

Cheers
Blair

ringroad1 · Post by **ringroad1** » Thu Mar 01, 2012 5:23 pm

darenager wrote:What are the power requirements for this? Looks like single supply? If so I'll take one, any plans to do the others? (snare, clap, hats etc?)

there's pos, gnd and neg input at the top right, imagine it needs a bipolar supply.

Someone building a possibly similar version of this on electro-music suggested that it sounded not so boomy at 9v, pretty good at 12v, and spot on at 15v.

bananeurysm · Post by **bananeurysm** » Thu Mar 01, 2012 5:24 pm

negativspace - thanks for the info! It sounds like I can stick to shipping included no matter the destination.

darenager - power.. the original schematic asks for +/-15 I believe.. but I (and a few others) have been powering them with 2 9 volt batteries (in a +/- configuration) and it works and sounds great!

I am planning on doing more drum modules, possibly from the 808 but I'm not sure. I'd like to do 606 hats - but haven't started on that. I have a 909 kick drum pcb that has a few issues I need to troubleshoot still. And I have a Simmons SDS3 project that's probably getting attention next. (Theres an electro-music forum thread that's probably deadish regarding that.) Anyone have any favorite clap circuits? (808 is obvious - but I bet there are more out there..)

mome rath and Barcode - sorry for the price - I'm trying to recoup the R&D that went into several runs/revs. Also using PCB fabs in the US is kinda pricey - but it's important to me to stick with it. (And high quality boards are also important!)

Eitherway - total parts cost with 1/4" jacks and pots ends up being around $15 - so it's still a pretty cheap project still!

bananeurysm · Post by **bananeurysm** » Thu Mar 01, 2012 5:26 pm

ringroad1 wrote: Someone building a possibly similar version of this on electro-music suggested that it sounded not so boomy at 9v, pretty good at 12v, and spot on at 15v.

It certainly sounds boomy and "right" to me at 9v.. but I haven't experimented with other supplies. I'll do so and post audio - though it'll probably be a weekish before that happens.

I assume whatever thread you were following is basically the same circuit.. the 808 schematics are all over the place - and it's an elegant design that doesn't really need much improvement!

ringroad1 · Post by **ringroad1** » Thu Mar 01, 2012 5:45 pm

Good news on the 9v front, makes it more adaptable for diff power supplies.

If you're looking at other drum modules to do, I always wanted a little analogue Latin friend for my 606, so would fancy the congas, rim shot and cowbell from the 808 but I might be on my own there :-)

negativspace · Post by **negativspace** » Thu Mar 01, 2012 6:01 pm

The 808 rimshot is actually one of my favorite x0x sounds. And the cowbell's... well, distinct at least. I don't even remember the congas, which probably tells the whole story there. Still, I think it would be nice to see something other than kick/snare/hats for a change. (How about the 808 Cymbal?)

I think 606 hats would be great. I've always been partial to those, even when I had an 808 and 909 alongside my 2 606s. I don't need one as I still have a 606, but definitely an unsung circuit IMO and one that's not already out there. (Who am I kidding, I'd still probably build one.)

ringstone · Post by **ringstone** » Thu Mar 01, 2012 6:06 pm

BTW Ryk Miller's Liquid hihat is a great board for playing around with all sorts of 808/606 style hihat/cymbal sounds. I have a couple in my backlog to build up.

Cheers
Blair

EMwhite · Post by **EMwhite** » Thu Mar 01, 2012 6:07 pm

Dumb question but is the Trig input compatible with a Vdrum Roland pad or is it more of modular synth square trigger?

And how much does the BOM total up to?

Revok · Post by **Revok** » Thu Mar 01, 2012 6:29 pm

I would probably kill to get a Simmons Clap Trap type clap so I'm going to try to push you in that direction for the next project 8_)

bananeurysm · Post by **bananeurysm** » Thu Mar 01, 2012 7:30 pm

Revok wrote:I would probably kill to get a Simmons Clap Trap type clap

The old analog or digital one? I can only find demos of the digital one.. which sounds awesome. Got any examples of the old analog one? And have schematics of either one? (I imagine the digital guy uses some lofi samples on eprom or something?)

EMwhite - I would think vdrums would work fine. I actually have a set, I should test that.

bananeurysm · Post by **bananeurysm** » Thu Mar 01, 2012 7:33 pm

Oh also - my mouser BOM with 1/4" jacks and alpha pots is about $15. I'm happy to share it with anyone who wants it.

mckenic · Post by **mckenic** » Thu Mar 01, 2012 7:53 pm

Pfurmel wrote:If you can manage postage to Ireland, I'll buy one.

Wanna split shipping? I wouldn't mind giving this a go - looks like a straight forward build!

Paradigm X · Post by **Paradigm X** » Fri Mar 02, 2012 4:15 am

ringstone wrote:BTW Ryk Miller's Liquid hihat is a great board for playing around with all sorts of 808/606 style hihat/cymbal sounds. I have a couple in my backlog to build up.

Cheers
Blair

Certainly is!

Ive built an uber modded version (switching caps to change range), and actual 606/dr110 envelopes (modded for decay envelopes) and 110vca, sounds amazing! Still got a few things to sort out but its f'in brilliant!

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[ORDER] 808 kick drum PCBs

[ORDER] 808 kick drum PCBs

Re: [ORDER] 808 kick drum PCBs