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 Forum index » DIY Hardware and Software » Developers' Corner
Any simple bass drum schematic? or snare?
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TtF



Joined: Mar 28, 2014
Posts: 1
Location: Brussels

PostPosted: Fri Mar 28, 2014 5:07 am    Post subject: Reply with quote  Mark this post and the followings unread

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 Very Happy
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 Crying or Very sad ; - No modularity Crying or Very sad (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 Smile
Sorry for this bad English Embarassed

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Blue Hell
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Joined: Apr 03, 2004
Posts: 20734
Location: The Netherlands, Enschede
Audio files: 158
G2 patch files: 318

PostPosted: Sat Mar 29, 2014 11:49 am    Post subject: Reply with quote  Mark this post and the followings unread

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



Joined: Nov 14, 2014
Posts: 2
Location: Iceland

PostPosted: Sat Nov 15, 2014 6:08 am    Post subject: I know this thread is old but Reply with quote  Mark this post and the followings unread

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.
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khakifridge



Joined: Jul 15, 2014
Posts: 10
Location: UK

PostPosted: Mon Nov 17, 2014 2:01 am    Post subject: Re: I know this thread is old but Reply with quote  Mark this post and the followings unread

ragnar wrote:
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.


Are you connecting a naked speaker to the output? I think you'll need an amplifier of some sort.

Quote:
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 ?


I don't think the noise generator features in the BD sound - it's only connected to the hi-hats and snare circuits.

Quote:
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 ?


Sounds correct. There's a schematic on page 1 showing how to connect the pot.
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ragnar



Joined: Nov 14, 2014
Posts: 2
Location: Iceland

PostPosted: Mon Nov 17, 2014 4:57 am    Post subject: Reply with quote  Mark this post and the followings unread

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.
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khakifridge



Joined: Jul 15, 2014
Posts: 10
Location: UK

PostPosted: Tue Nov 18, 2014 12:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Good news! Cool

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



Joined: Jun 14, 2013
Posts: 49
Location: Oslo

PostPosted: Tue Nov 25, 2014 6:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

Heres a stripboard layout for those others that have searched for 9V drum stuff.
Using -Minus- values.
Should work, will know tomorrow Wink
Posted Image, might have been reduced in size. Click Image to view fullscreen.
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Starspawn



Joined: Jun 14, 2013
Posts: 49
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PostPosted: Wed Nov 26, 2014 8:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

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)
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richardc64



Joined: Jun 01, 2006
Posts: 623
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PostPosted: Thu Nov 27, 2014 7:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Starspawn wrote:
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)


This is the first time I've heard of noise being too high when powered by 9volts. Is that really what you meant to say?

In the monotripe the noise gets attenuated by a 10:1 voltage divider (R31, R29) before being applied to Q8 and Q10. By adjusting those two resistors the 2-transistor noise source should provide a sufficient level even without an op amp buffer.

R34 & R43 also affect the levels that reach Q8 and Q10.

Although the three randomly selected transistors I tried for noise produced equal-sounding levels, I still used a socket (3 receptacles hacked from a low-profile d.i.p. socket,) for the reverse-biased transistor.


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Starspawn



Joined: Jun 14, 2013
Posts: 49
Location: Oslo

PostPosted: Thu Nov 27, 2014 7:35 am    Post subject: Reply with quote  Mark this post and the followings unread

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.
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Starspawn



Joined: Jun 14, 2013
Posts: 49
Location: Oslo

PostPosted: Fri Nov 28, 2014 2:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

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?
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