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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Tue Aug 19, 2008 10:41 am Post subject:
Bass++ Drum Synth Voice Subject description: Scott, you holdin'out on us? |
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I just noticed this on Scott Stite's website. It looks like a re-do of the UD-1 without the 566.
http://mypeoplepc.com/members/scottnoanh/birthofasynth/id28.html
You were going to tell us about this, weren't you Scott? |
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Scott Stites
Janitor
Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Tue Aug 19, 2008 11:05 am Post subject:
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Yeah, I was intending on it. I was waiting on a review of the text by TH, but the school year's started, and he's typically snowed under (to pardon a Minnesota-biased pun). _________________ My Site |
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Coriolis
Joined: Apr 11, 2005 Posts: 616 Location: Stilling, Denmark
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Posted: Tue Aug 19, 2008 12:40 pm Post subject:
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Great sample, Scott. Was that really only the Bass++? No other voices?
It does a lot then...
Well, I have loads of LM13700's that I've had little use for, so this looks like a must build - like, oh...the MPS, another XR-VCO, etc.
A very exhausting time to DIY...
C _________________ Some Rubber Stamp Sound Effects - and other sound effects |
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Scott Stites
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Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Tue Aug 19, 2008 1:33 pm Post subject:
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No - the Bass++ was only providing the drums in the sample. I should clarify that on the page.
Cheerios,
Scott _________________ My Site |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Tue Aug 19, 2008 10:25 pm Post subject:
Bass++ Drum Synth Voice |
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Neato burrito! Also, it looks like a very simple circuit - easy to knock out a few on perfboard and play around. Thanks Scott and Thomas!
Tim (drum and drummer) Servo |
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Rykhaard
Joined: Sep 02, 2007 Posts: 1290 Location: Canada
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Posted: Tue Aug 19, 2008 11:20 pm Post subject:
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Wow! Agreed! Thank you greatly Thomas and Scott!
I'd loved the UD-1 that I'd built in the mid 90's. The Bass++ though! This is a definite must for at LEAST 1 of them to be built!!
Now - to delay everything else and build 1 right away, or ...... |
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richardc64
Joined: Jun 01, 2006 Posts: 679 Location: NYC
Audio files: 26
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Posted: Wed Aug 20, 2008 9:10 am Post subject:
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Say, what's the CV range for that VCO? Are negative voltages OK? _________________ Revenge is a dish best served with a fork... to the eye |
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Scott Stites
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Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Thu Aug 21, 2008 3:13 pm Post subject:
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CV Range for the VCO is +/-5V (10Vp-p) like all of other Thomas' goodies (he likes to stick to the Electronotes standard). _________________ My Site |
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slo
Joined: Feb 18, 2007 Posts: 204 Location: Victoria, BC
Audio files: 1
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Posted: Sat Sep 06, 2008 7:12 am Post subject:
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What a great sample on your site Scott. I'd like about 10 of these to start my Taiko drum ensemble
George |
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Sat Sep 06, 2008 8:45 am Post subject:
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Quote: | You were going to tell us about this, weren't you Scott? |
Oh no ............ better sell my remaining UD-1's kits fast before they all find out
I ilke the LM13700 implimentation on this circuit !!! Very cool
Bill |
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jean-louise
Joined: Apr 27, 2009 Posts: 73 Location: berlin
Audio files: 2
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Posted: Mon Apr 27, 2009 11:52 am Post subject:
hello and question |
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hello!
this seems to be a very fine place!
i have built the bass++ successfully and i am delighted with its sound - it is such a powerful little circuit. it works great though i am using only +-9V and a lm13600 instead of the 13700 (i'll try replacing that when i order the parts for the mps i am going to build next).
one thing i really like to try is to incorporate the bass++ and the mps into my acoustic drumset and i have made two piezo trigger pads for the purpose.
it worked quite well without any additional electronics, but the impact sound suffered some kind of multitriggering. so then i tried the drum trigger from the mfos-website and that made things far better, but on some occasions there still is multitriggering going on. is there something i could do about it? e.g. add additional 10m resistors to the trigger board to reduce voltage? or reduce sensitivity of the input by putting in a bigger pot? or could it be a mechanical problem within the pads?
an help is very appreciated..
thanks to you all, - just reading through some topics of the diy subforum has already been giving me good advice and insight.
oh and if you think this is not the right place for my question i could repost it in the mfos section or you just move it over there or any other place you think it is appropriate for.
cheers
jan |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Mon Apr 27, 2009 12:25 pm Post subject:
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Jan _________________ Jan
also .. could someone please turn down the thermostat a bit.
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jean-louise
Joined: Apr 27, 2009 Posts: 73 Location: berlin
Audio files: 2
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Posted: Mon Apr 27, 2009 12:36 pm Post subject:
Re: hello and question |
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jean-louise wrote: |
thanks to you all, - just reading through some topics of the diy subforum has already been giving me good advice and insight.
cheers
jan |
... but has not solved the problem described above.
just to avoid misunderstanding |
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Mon Apr 27, 2009 3:11 pm Post subject:
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Quote: | but has not solved the problem described above.
just to avoid misunderstanding |
Instead of using a larger pot, just try a 10K in place of the 20K for R17. Much cheaper alternative. This will get the comparator to trigger on more of the signal rather then the "hash". The lower resistor value will allow you to adjust a higher trigger threshold. What is the source of your trigger input? That may be your problem. Perhaps the input comparator needs a bit of hysteresis? Let us know what you encounter with the resistor change ....
Bill |
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jean-louise
Joined: Apr 27, 2009 Posts: 73 Location: berlin
Audio files: 2
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Posted: Tue Apr 28, 2009 6:15 am Post subject:
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Quote: | try a 10K in place of the 20K for R17. Much cheaper alternative. This will get the comparator to trigger on more of the signal rather then the "hash". |
ah yes, that makes sense to me. cheap is good!
Quote: | What is the source of your trigger input? That may be your problem. |
i am using a standart piezo disc epoxied to a rather thin aluminium plate. it sits between two sheets of mouse pad and these are glue on a piece of wood. so maybe there's some vibration going on that isn't damped by the mouse pad..
Quote: | Perhaps the input comparator needs a bit of hysteresis? |
i am quite new to electronics, (never thought i would pick up a soldering iron), so there are a lot of concepts i don't really know about.. but as i understand it, the hysteresis would be achieved by a schmitt trigger or something like that?
i'll try the 10k resistor after work and post the result here.
thanks for your help!
& greetings
jan |
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jean-louise
Joined: Apr 27, 2009 Posts: 73 Location: berlin
Audio files: 2
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Posted: Tue Apr 28, 2009 10:24 am Post subject:
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aha!
i reread the description of ray wilson's drum trigger circuit and there seem to be two possibilities.
first i could change the resistor R5 = 2M to e.g. 1M. then i'd get a shorter decay. but that will shorten the cv decay too, i think, and if it stops the multitriggering i don't know.
second, i understand that the last opamp-..er..stage(?) acts as a comparator and it's that stage that actually forms the trigger pulse. i read that in order to add hysteresis to an opamp comparator, one sends the output back into the noninverting input ("+") through a resistor, thus creating a positive feedback loop.
would that be the right direction to go? also what values should i try for that additional resistor? and should the feedback loop be inserted before or after that last diode (D3)?
cheers
jan
EDIT: i think i'll just try it and see what happens - and maybe do some more reading before as i am a little afraid to break something. but answers are still very welcome!
j |
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jean-louise
Joined: Apr 27, 2009 Posts: 73 Location: berlin
Audio files: 2
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Sat May 02, 2009 5:42 pm Post subject:
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Jan
Oh, great news !! Glad that's working now and the recording proves that Your choice of feedback resistor is good. If you want to bit more hysteresis, just change it to about 2.2M just eradicate ALL bounce. Looks like the lessening of the circuits sensitivity did the trick.
This success will lead to more projects I am sure and welcome the problems. If not for these isues you had, you may not have learned about hysteresis and how sensitivity effects operation of your circuit in this application.
Welcome to DIY and nice job man !!!
Bill |
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