Comments on: mini space rockers

By: Matt Painter

Matt Painter — Sun, 30 Oct 2011 02:41:20 +0000

Hi Eric! Here’s my contribution to Mini Space Rocker world domination - it’s my Doof Doof machine:

http://soundcloud.com/nullpainter/the-doof-doof-machine

It’s fed by an oscillator combined with a momentary divider for extra cheese.

By: murqui

murqui — Tue, 27 Sep 2011 23:54:12 +0000

i will build it and send you some noises!!
great circuit! great video presentation!

By: George

George — Fri, 24 Jun 2011 15:00:50 +0000

Great little circuit, built one with the central timing resistors ( the two 33k with one end each tied to +V) replaced by a pot, wiper tied to +V, gives variable sound - not like I was expecting, but works awesome. Strangely, the center part of the pot doesn’t oscillate, only each unbalanced end of the pot’s range.

By: David

David — Tue, 22 Mar 2011 03:08:37 +0000

another way I can see to deal with the 3 caps issue is to make a box and on the outside have a socket of some type to insert the proper 3 caps like in science discovery toys… If you had a small collection of CAPS you could insert 3 for one sound and then insert 3 other for another…. at least no soldering them in…. Idea B is to make a patch bay with cap value in the box…. using patch cables you could select what you want for each voice… (bad deal is for a four voice tone device… like mentioned above, you’ll need 24 patch cables…. and no sweeping the pitch while it plays). The ability not to sweep the pitch and freq on the fly is a down side, but remember we couldn’t do that with the original CR and TR series drum machines. I think what is more interesting is that you could send each voice out independently to further filter and effect the output (made possible by doing the trigger mod described above… that makes this circuit musically useful beyond a learning tool, fun gadget and sampling it for musical use.)

By: David

David — Tue, 22 Mar 2011 02:40:21 +0000

has anyone tried to make made a printed (etched ) board for this little project… if I had access to the bottom side art i could do a few here at the crib…. the images above almost gives me what I would need but I can’t tell if the image is properly sized so the component holes are spaced correctly (or close)…. if the images are close to production size I could draw the trace for the bottom with a black sharpy in a pinch…. thanks guys

By: Dean

Dean — Sat, 26 Feb 2011 12:18:51 +0000

Yeah!!!…just triggered my Edrums with these sounds….more….more,can you send me a whole patch?…….brilliant.

By: admin

admin — Sun, 02 Jan 2011 23:21:03 +0000

variable capacitors are not available in the range of values required for this project.

By: martin

martin — Fri, 31 Dec 2010 18:59:21 +0000

A friend of mine built one of these and i was wondering if you put variable capacitors in c1,c2 and c3. Could you make more sounds just by adjusting them?

By: Jaap

Jaap — Fri, 24 Dec 2010 08:35:44 +0000

Thanks for the layouts! This is my first electronics project. I’m trying to have 3 MSR’s share the same battery (in parralel) and output, but that causes a problem when I trigger two at the same time. I get very distorted sound and most of the time no sound at all.

Is there a way to isolate the individual circuits while having them share power source and output?

By: Neal

Neal — Tue, 21 Dec 2010 22:55:02 +0000

I built the circuit with transistors 2102 (3x) & 4036 (1), made a contact switch at the ground and have very cool results. The circuit triggers the MK-3 well (from V+ pin of 4036). I plan to incorporate switches for range on C2 and decay on C3 (220uf gives a long sweeping up & down discharge, nice!)
I plan on building the circuit with the correct transistors for piezo control.
Big thanks for your inspired circuitry and generosity. Recordings pending…