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 Forum index » DIY Hardware and Software
Hearn Morley VCO, VCF,ADSR modules
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adambee7



Joined: Apr 04, 2009
Posts: 420
Location: united kingdom

PostPosted: Tue Sep 18, 2012 2:06 am    Post subject: Hearn Morley VCO, VCF,ADSR modules Reply with quote  Mark this post and the followings unread

Just wondered if anyone has built anything from the modules available from Hearn Morley?

https://sites.google.com/site/hearnmorley/home
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ashleym



Joined: Aug 20, 2009
Posts: 181
Location: uk

PostPosted: Tue Sep 18, 2012 6:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Have a look at Muffs

http://www.muffwiggler.com/forum/topic-54357-.htmlall&postdays=0&postorder=asc&sid=5914464a0e7076bb58cde9b6b79f04e3

Frequency Central is putting together some boards for these

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frequencycentral



Joined: May 25, 2008
Posts: 186
Location: UK

PostPosted: Tue Sep 18, 2012 1:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

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.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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littlem4tt



Joined: Jun 30, 2013
Posts: 40
Location: uk

PostPosted: Fri Aug 30, 2013 6:31 am    Post subject: Reply with quote  Mark this post and the followings unread

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: 40
Location: uk

PostPosted: Fri Aug 30, 2013 6:52 am    Post subject: Reply with quote  Mark this post and the followings unread

heres the adsr
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littlem4tt



Joined: Jun 30, 2013
Posts: 40
Location: uk

PostPosted: Fri Aug 30, 2013 6:55 am    Post subject: Reply with quote  Mark this post and the followings unread

hm2040 wired as stereo svf

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littlem4tt



Joined: Jun 30, 2013
Posts: 40
Location: uk

PostPosted: Fri Aug 30, 2013 6:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Hm2040 wired as 24db lo pass

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ungleichklang



Joined: Dec 03, 2011
Posts: 81
Location: East-Belgium

PostPosted: Fri Aug 30, 2013 3:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

woooow, I must get my fingers on this adsr one day Smile
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ungleichklang



Joined: Dec 03, 2011
Posts: 81
Location: East-Belgium

PostPosted: Fri Sep 06, 2013 12:20 am    Post subject: Reply with quote  Mark this post and the followings unread

o.k., just for the note in this forum

after a bit of reading and getting biiig smiles of the soundexamples I found that frequency central said at muffwiggler that he plans to do a Kickstarter Project for the VCO-Chip.
There might also be an offer for the PCB + some other chips

well, I'm in Smile

Hope I can get my hands on some ADSR PCB's from littlem4tt too Smile

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littlem4tt



Joined: Jun 30, 2013
Posts: 40
Location: uk

PostPosted: Fri Sep 06, 2013 6:10 am    Post subject: Reply with quote  Mark this post and the followings unread

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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ungleichklang



Joined: Dec 03, 2011
Posts: 81
Location: East-Belgium

PostPosted: Fri Sep 06, 2013 6:59 am    Post subject: Reply with quote  Mark this post and the followings unread

littlem4tt wrote:
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.


For I have some 20 unsoldered PCBs laying around here and I never etched myself befor I will wait Wink
But don't forget me and count me in with about 4 PCBs Smile

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greetings from belgium, Sascha

My new blogspot: http://ungleichklang.blogspot.com
My Youtube-Channel: http://www.youtube.com/user/ungleichklang


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jackdamery



Joined: Apr 26, 2010
Posts: 72
Location: UK

PostPosted: Tue Sep 10, 2013 6:07 am    Post subject: Reply with quote  Mark this post and the followings unread

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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