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adambee7
Joined: Apr 04, 2009 Posts: 420 Location: united kingdom
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ashleym
Joined: Aug 20, 2009 Posts: 181 Location: uk
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frequencycentral
Joined: May 25, 2008 Posts: 186 Location: UK
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Posted: Tue Sep 18, 2012 1:53 pm Post subject:
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Yeah I have built a couple of HMVCO1c modules, really easy build and a very stable workhorse VCO. I added a 4024 to give -1 oct square, -2 oct square and a couple of diodes to give -2oct pulse - all opamp buffered too.
My layout is pretty cool, but a originally went with just a coarse tune knob and a +1 oct/normal/-1oct toggle, it really needs a fine tune too, so I gotta do some revisions...
The challenge of doing a run of these is stumping up the initial amount for to get a decent price break for a bulk order of chips.
I've got a couple of the VCF chips too, planning to do a Prophet style filter when I get time.
_________________ http://www.frequencycentral.co.uk/ |
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littlem4tt
Joined: Jun 30, 2013 Posts: 44 Location: uk
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Posted: Fri Aug 30, 2013 6:31 am Post subject:
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I have been lucky enough to build all three now. I have built 2 x osc, the filter as 24db lowpass and the 12db stereo filter and just recently i have built the adsr with cv inputs for the a,d,s and r. All are fantastic i cant really say much more really. The chips are pretty hardy and as i'm new at this they have taken my abuse very well. The oscillators and the filters i made on bread board but with the adsr i made a design in eagle and gave etching a go. |
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littlem4tt
Joined: Jun 30, 2013 Posts: 44 Location: uk
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Posted: Fri Aug 30, 2013 6:52 am Post subject:
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heres the adsr
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littlem4tt
Joined: Jun 30, 2013 Posts: 44 Location: uk
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Posted: Fri Aug 30, 2013 6:55 am Post subject:
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hm2040 wired as stereo svf
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littlem4tt
Joined: Jun 30, 2013 Posts: 44 Location: uk
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Posted: Fri Aug 30, 2013 6:57 am Post subject:
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Hm2040 wired as 24db lo pass
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AlasdairMoons
Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium
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AlasdairMoons
Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium
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littlem4tt
Joined: Jun 30, 2013 Posts: 44 Location: uk
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Posted: Fri Sep 06, 2013 6:10 am Post subject:
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i have quite a good response with this ADSR. After thorough testing i might get some pcbs printed. There are a couple of things i want to change in the design. It is quite hard to solder because i made the pads a bit too small.
If you fancy making it yourself i don't mind sharing the eagle files.
Or wait a few months and i might be ready to get some pcb's made properly. |
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AlasdairMoons
Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium
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jackdamery
Joined: Apr 26, 2010 Posts: 75 Location: UK
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Posted: Tue Sep 10, 2013 6:07 am Post subject:
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Hey I built up the VCO, but running it from +/-9v. It's getting CV control from an Arduino via a MCP4921 DAC.
https://soundcloud.com/dot/bank-holiday-analogue-synth
Yesterday I received a second one and they really sound so fat together. Just need to get them scaling correctly. |
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littlem4tt
Joined: Jun 30, 2013 Posts: 44 Location: uk
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Posted: Thu Jan 08, 2015 7:20 pm Post subject:
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I made a pcb for 2 chips. Full info at http://reallyniceaudio.com/?p=282
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Snaper
Joined: Feb 28, 2014 Posts: 217 Location: Hungary
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Posted: Fri Jan 09, 2015 11:27 pm Post subject:
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Any chance for the layout Rick? |
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