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nicolas3141
Joined: May 25, 2007 Posts: 185 Location: Christchurch, New Zealand
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Posted: Mon May 25, 2015 3:38 am Post subject:
Touch sensitive mini synth |
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In the same sort of vein as my bleepy machine of last year, this is a similar mini-synth, but this time touch controlled. With reasonably large touch plates made of something that is not too good a conductor you can get some measure of control. Stainless steel is ideal. Not quite play-a-tune control, but fun nevertheless. Springy touch plates allow LFO type effects by bouncing. VCO+VCF
Nicolas Last edited by nicolas3141 on Tue May 26, 2015 3:55 am; edited 1 time in total |
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nicolas3141
Joined: May 25, 2007 Posts: 185 Location: Christchurch, New Zealand
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Posted: Mon May 25, 2015 3:43 am Post subject:
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And here is the big brother with 2xVCO+VCF+VCA
Nicolas Last edited by nicolas3141 on Tue May 26, 2015 3:57 am; edited 1 time in total |
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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 May 25, 2015 3:46 am Post subject:
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Looks like nice devices, and a good idea to have that output transformer.
Have you got any sound samples?
Edit .. oh wait .. I now re-realize I heard some .. hmm or did I .. I saw some ... _________________ Jan
also .. could someone please turn down the thermostat a bit.
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nicolas3141
Joined: May 25, 2007 Posts: 185 Location: Christchurch, New Zealand
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Posted: Mon May 25, 2015 4:46 am Post subject:
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No sound samples yet for this one. Will see what I can do next week. The vco is a normal saw sound, the filter is a weakish bandpass which can sound a bit resonant if you treat it right. Not the best sounding filter out there, but I am challenging myself with what I can achieve with a single quad opamp chip and nothing else other than simple 2 legged stuff |
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nicolas3141
Joined: May 25, 2007 Posts: 185 Location: Christchurch, New Zealand
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Posted: Tue May 26, 2015 12:00 am Post subject:
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Here is a stripboard layout. Not verified yet as the prototype I have built is a bit messier. Offboard connections not shown, but should be easy to work out.
Nicolas |
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nicolas3141
Joined: May 25, 2007 Posts: 185 Location: Christchurch, New Zealand
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Posted: Tue May 26, 2015 4:01 am Post subject:
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There were some errors in the BOM I posted earlier, so I have removed those and am uploading this corrected version. The filter needs to be on the edge of oscillating to sound interesting, but if it persists in oscillating all the time you will need to reduce R14. I found 600k to be just right on my prototype. Needs some experimentation so perhaps putting a trimpot in there would be a good idea.
Nicolas Last edited by nicolas3141 on Mon Jun 01, 2015 2:11 am; edited 1 time in total |
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nicolas3141
Joined: May 25, 2007 Posts: 185 Location: Christchurch, New Zealand
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dougseidel
Joined: Feb 10, 2010 Posts: 74 Location: NJ
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Posted: Tue Jun 23, 2015 6:37 am Post subject:
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Thanks! that is a really fun circuit! I made a dual version, which is fun to play. _________________ http://soundcloud.com/douglasmseidel |
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L´Andratté
Joined: Sep 23, 2012 Posts: 150 Location: Hamburg, Germany
Audio files: 5
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Posted: Tue Jun 23, 2015 12:41 pm Post subject:
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Amazing, thanks!
Your circuits will be a fully featured modular synth soon.
And I keep being inspired by your design philosophy.
Would love to hear/see more of the resulting music...
PS: It seems, there are some photos missing in the first posts, or is it me missing something |
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wackelpeter
Joined: May 05, 2013 Posts: 461 Location: germany
Audio files: 10
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Posted: Wed Jun 24, 2015 2:18 pm Post subject:
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[quote="nicolas3141"]No sound samples yet for this one. Will see what I can do next week. The vco is a normal saw sound, the filter is a weakish bandpass which can sound a bit resonant if you treat it right. Not the best sounding filter out there, but I am challenging myself with what I can achieve with a single quad opamp chip and nothing else other than simple 2 legged stuff [/Quote]
so no mice are included?
https://www.youtube.com/watch?v=F9nGyPz9uT0 _________________ https://soundcloud.com/bastian-j |
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animalman
Joined: Jan 21, 2013 Posts: 18 Location: out past midnight
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Posted: Thu Jun 25, 2015 10:12 am Post subject:
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Looks like good fun. Sorry my ignorance, but is there a way to build this without the output transformer? And can someone tell what is the transformers function?
Hi-fi snake oil dudes often mention how warm audio sounds just running it through transformers |
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Starspawn
Joined: Jun 14, 2013 Posts: 85 Location: Oslo
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Posted: Thu Jun 25, 2015 10:36 am Post subject:
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Hmm, also if one wanted to use it as LFOs would increasing C3 work? |
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wackelpeter
Joined: May 05, 2013 Posts: 461 Location: germany
Audio files: 10
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Posted: Fri Jun 26, 2015 1:55 am Post subject:
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animalman wrote: | Looks like good fun. Sorry my ignorance, but is there a way to build this without the output transformer? And can someone tell what is the transformers function?
Hi-fi snake oil dudes often mention how warm audio sounds just running it through transformers |
http://electro-music.com/forum/topic-64453.html&highlight=
in the first post Nicolas mentions it's function... _________________ https://soundcloud.com/bastian-j |
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nicolas3141
Joined: May 25, 2007 Posts: 185 Location: Christchurch, New Zealand
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Posted: Sat Sep 26, 2015 4:16 pm Post subject:
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If you are building this as a separate unit with output to headphones then the transformer can be avoided. Or add a battery powered amp like an LM386 and include a speaker in the unit, to do this just use a cap between the LM324 and LM386 to avoid any DC bias.
The transformer is only necessary if you want to connect this up with other non-battery-powered gear such as effects/mixer/amp/PA/etc.
Nicolas |
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