Quad Adjustable Tom

rpocc · Last edited by rpocc on Fri Dec 13, 2013 1:04 am; edited 2 times in total

Hi there!

I want to share with you one of my very first projects: Quad Adjustable Tom.

The Quad Adjustable Tom is minimalistic percussion module that consists of 4 identical analog electronic toms. The main feature of this module is that it is very compact unit built around one Quad Opamp. It is supposed that pitch adjustment is rare operation which may be done with on-board trimmer potentiometers while the front panel has only gate inputs and audio outputs which consume only 4hp of space. Such modules can be joined to kind of compact percussion cluster. The sound of this module is similar to analogue Boss rhythm-boxes. Of course, the trimmers can be replaced with full-size front-panel potentiometers.

Detailed information including schematics, stripboard layout, BOM and SPICE netlist can be found on the project page on my website. I'm not so good in English, but information on that page is enough to understand how module works and how to build it. Enjoy.

The module can be powered from any bipolar supply, but designed for +/-12v. The power consumpion and other specifitations is missing at this moment.

adjustable_tom_schematics_v3.png

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Schematics

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adjustable_tom_test1.mp3

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Sound example

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adjustable_tom_test1.mp3

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LFLab · Posted: Thu Oct 24, 2013 4:26 am Post subject:

Pretty cool! Did you build it already?
Thinking of making a PCB, but it's so simple, perf/stripboard is quicker probably.

rpocc · Posted: Thu Oct 24, 2013 4:49 am Post subject:

LFLab · Posted: Fri Oct 25, 2013 12:46 am Post subject:

Ah yes, overlooked that sound sample (I was/am at work).
Does indeed look like a pretty intense stripboard layout, maybe I'll try a dual first.

feggster · Joined: Sep 12, 2011 Posts: 50 Location: uk

this is good Smile

thanks for sharing
I will attempt to build a dual tom...i have spare tl072 at the moment.

feggster · Joined: Sep 12, 2011 Posts: 50 Location: uk

I am trying to build a single tom on breadboard and have not been successful yet!
what is needed to trigger this circuit?

rpocc · Posted: Tue Oct 29, 2013 6:36 am Post subject:

donpachi · Posted: Tue Oct 29, 2013 12:00 pm Post subject:

Awesome, just what I need! I guess this will work on dual 15 V power too? Thank you for this project Cool

feggster · Joined: Sep 12, 2011 Posts: 50 Location: uk

rpocc · Posted: Wed Oct 30, 2013 6:30 am Post subject:

donpachi · Posted: Wed Oct 30, 2013 2:02 pm Post subject:

Thanks a bunch rpocc Very Happy

I will give it a try very soon and report back here.

flab · Joined: Feb 13, 2012 Posts: 57 Location: Glasgow

i build a dual version of that two days ago -tryed manydifferent values for C3 and C4- do you think that it needa amplification at the output ? a buffer maybe

rpocc · Posted: Wed Oct 30, 2013 11:34 pm Post subject:

roglok · Joined: Aug 28, 2010 Posts: 148 Location: uptown

thanks for posting this. will definitely try it out.

rpocc · Posted: Fri Dec 13, 2013 1:06 am Post subject: Errata

Sorry guys, I don't know how it happened, but value of R6 on the Schematic and BOM was incorrect. Right value should be 10M instead of 1M! Files are updated.

donpachi · Posted: Sun Jan 05, 2014 2:46 pm Post subject:

Thank you again! My build uses a 4 TE panel, the sound is very nice Cool

Please don´t mind the bad quality of the picture.
The circuit is running off a +/-15 V supply and can be triggered by 5 V gates, I made no component substitutions. One of the four toms is not always working, but that will be conquered, too Very Happy

Highly recommended, four great drums made in a single afternoon!

toms.jpg

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