Any simple bass drum schematic? or snare?

[TtF]

Hi, This is my first post on this forum, I was looking for a simple no-808/909 analog bassdrum and I found this one
I'm a pure rookie in electronics so I have few questions if someone can answer that would be great !
I think I'll make 3 voice modules + 1 amp module (with 3 inputs), all based on monotribe's drums, but I was thinking it was possible to output voices into another amp to extend sound-grain possibilities. I was wondering if it's possible to add a volume knob to each voices modules and also one to the amp (How people do on the monotribe ? are drums volume pre-mixed ?...).
I'm fond of Roland Grooveboxes and there are just 2 negative points that I noticed on theese machines : - No analog ; - No modularity (Excepted for the MC-307 wich is one of the most powerful thing I ever seen, don't mind about AudioFanzine reviews and YouTube videosn, thoose guys often don't understand the main idea of this groovebox) Sorry for this digression. So all that to say that theese Monotribe's drums wi'll perfectly fit in my project of groovebox-oriented modular
Sorry for this bad English

[blue hell]

I have no idea about eight oooh things .. but to you anyway TtF.

[ragnar]

I just put the bass drum together, its not working as I was expecting.
I don´t have a noise source a.t.m., that must have something to do with it :Þ

I was wondering if you could clarify how to connect speakers to this, I get some potting sound when I connect speakers to "rhythm" and ground. its not sounding too far from the pulse Im sending in on the input stage.

the noise generator you have built, the two transistor white noise one. where do you connect that into the circuit, right before the output transistor stage ? where it says bd out on the schematic ?

the decay is not doing much either, I have a 1k pot connected from the middle pin to one of the far ends to ground. is this the right way to connect it, as a variable resistor ?

thanks for taking your time to answer questions here, super helpful to have people like you around the world !

all the best
r.

[khakifridge]

[ragnar]

thanks khakifridge
I went over the breadboard last night and I had connected the what should have gone into the collector into the emitter, :Þ.

it works now! love the sound, can believe how few components are needed for this one...

thanks again.
all the best.
r.

[khakifridge]

Good news!

This one was on my list of possible BDs to try out. From what you've said, I think it definitely warrants a build.

[Starspawn]

Heres a stripboard layout for those others that have searched for 9V drum stuff.
Using -Minus- values.
Should work, will know tomorrow

[Starspawn]

Working, but noise source not a good match, way to high on 9V with opamp buffer, and without its still not in the right range, messed about with pots between and so on today without getting satisfied, will try some different transistors tomorrow.
Kind of hoped that was a no transistor picking needed circuit :/
(Courtesy of Richardc64 I think it was)

[richardc64]

[Starspawn]

Yeah, Im socketing and trying some different transistors later today, and those are the resistors Im fiddling with.
Its also in a thing with lots of hanging wires, so its picking up a lot of rumbly noise which is what I meant with to high, as in to sensitive and amplifying that to much.

[Starspawn]

Got distracted, but while I have your attention, I did your piezo to trigger as well, and it didnt give me the sensitivity or levels I was looking for .... so increase resistor to ground on input for more sensitivity, and increase resistor in feedback path for more gain? Or have I misunderstood?

And by adjusting input level we are talking again increasing resistance to ground and decreasing to input path?

[itsnotworking]

[MapacheRaper]

Fascinating thread.

I also discovered this:
https://www.youtube.com/watch?v=UkvpSkzcYWU

Im not sure, but you have three caps in front of the transistor in the schematic : C65, C60 and C66. Proabably one of these (or all) are timing caps. You should experiment inserting a pot over there and figure out what changes make to the sound. Probably tuning the pitch up/down and doing bizarre things.

Changing (inserting a pot) instead the 470K resistor that goes to the base of the transistor could be useful

Maybe an more experienced user can give you a more precise answer, but I would start over there

That´s a lovely circuit to hack in

[PiercedFaceMan]

This BD circuit is bloody brilliant.
I built it last night and I was extremely happy that it worked wonderfully.
Used a 555 to trigger it =)

[PiercedFaceMan]

Hey guys.
I've built both the BD and SD (both the same schematic just different values)
I have now also built the 2 transistor WN gen for the SD but I'm not sure on how to use them together.
Could anyone tell me(or maybe do a schematic) of where to inject the WN into the SD circuit please.

Thanks.

[PHOBoS]

I looked around a bit but I am starting to suspect that the monotribe (assuming that's what you build the circuits of)
uses a processor to not only control the drums but also to generate the noise. Maybe you can use another white noise
generator but I don't know what the levels should be and if it has to be triggered together with the snaredrum.
Also the stripboard design in this thread only seems to have the drum part of the circuit and you need a lot more to
get the noise section aswell. It's not as easy as just inserting some noise into it. And then both the noise and the drum
have to be mixed together somehow.

[PiercedFaceMan]

Yeah it is the monotribe BD I've built.
Damn.
Oh well I'll just have to keep trying, I'm learning loads and having a blast so it's all good.
At least I have a simple drum and white noise circuit now.
Could you point me towards a snare drum circuit that I could try?

[elmegil]

808 snare isn't terribly complicated.

https://electro-music.com/forum/topic-45134.html

[gabbagabi]

page 4 on the pdf of the 6. post is a snare circuit that includes the noise

https://electro-music.com/forum/topic-28541-25.html

[PHOBoS]

^

[PiercedFaceMan]

Wow thanks guys, I definitely want to build the 808
Such a good sound and iconic to boot.

Last night I actually managed to build something that sounds good.
With a little extra circuitry I was able to use my white noise source
with the drum sound.
Man, when it worked, I nearly jumped for joy.
I'm not sure whether it's the most efficient way to do it but it works.

[gabbagabi]

uhh, that is a very little icon
thx

just saw the other post form Juanito about thr LED Thing and remembered his 808 video:
https://www.youtube.com/watch?v=xPBeEi4SE68

[zaphod betamax]

Wow! I had no idea that electronics magazines made it that late into
the first decade of the new century!

I used to read Radio-Electronics and Popular Electronics as a child
in the mid-seventees! I was actually way more active in DIY to about
1990, but then I stopped.

Have picked up the soldering iron again in 2020 though.

DIY is fun!

[AlanP]

I've built the Bastl Tea Kick, and it is fun... I just wish I could get rid of the click entirely. I've built the 808 snare and hats, I should probably solder up the 808 bassdrum too.

[zaphod betamax]

Here is the COMPLETE schematic of the Monotribe.

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