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A collection of circuits by Nicolas
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Pehr



Joined: Aug 14, 2005
Posts: 1307
Location: Björkvik, Sweden
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PostPosted: Mon May 25, 2009 10:13 am    Post subject:  A collection of circuits by Nicolas
Subject description: links to all the threads
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I couldn't resist gathering all these circuits somewhere. Very Happy

nicolas3141 wrote:
These circuits are not meant to be highly featured and sophisticated, but are intended to be easy to build and understand for those starting out in sdiy. Good enough to be musically useful, but simple enough so that you can build them in a few hours and then get back to making that music. A bit like the MFOS Soundlab, but with a more modular approach (and a bit more emphasis on CV generation). I also try and only use readily available and easily substitutable parts.

Cheers,
Nicolas


Simple ribbon controller for V/Hz synth:
http://electro-music.com/forum/topic-32651.html

Super simple V/Hz VCO:
http://electro-music.com/forum/topic-32689.html

Pitch-not-critical Sooper-Simple VCO;
http://www.electro-music.com/forum/topic-38087.html

Simple sawtooth VCO
http://electro-music.com/forum/post-292718.html

V/Hz state variable filter:
http://electro-music.com/forum/topic-34426.html

Noise source:
http://electro-music.com/forum/topic-34745.html

TRI2SAW:
http://electro-music.com/forum/topic-27934.html

ADSR:
http://electro-music.com/forum/topic-31473.html

LFO & VCLFO:
http://electro-music.com/forum/topic-32372.html

Simple S&H and VCA
http://electro-music.com/forum/topic-41277.html


updated and edited, 08-05-10, by v-un-v

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Last edited by Pehr on Tue Jun 02, 2009 3:20 am; edited 2 times in total
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frequencycentral



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PostPosted: Fri May 29, 2009 3:42 am    Post subject: Reply with quote  Mark this post and the followings unread

I just have to say thank you to nicolas 3141 for his work and to Pehr for cataloguing the collection. These are very interesting little circuits. And also well suited to adapting to stampbox use, which is my primary focus ATM
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v-un-v
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PostPosted: Fri May 29, 2009 4:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Actually I've done the same for Ian Fritz (a big link list)- but I have been waiting months for Ian to say yes Twisted Evil

Off for the weekend- will sort it out Monday Smile

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Pehr



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PostPosted: Fri May 29, 2009 5:15 am    Post subject: Reply with quote  Mark this post and the followings unread

v-un-v wrote:
Actually I've done the same for Ian Fritz (a big link list)- but I have been waiting months for Ian to say yes Twisted Evil

Off for the weekend- will sort it out Monday Smile


Thanks v for making this sticky Very Happy
Hope this is 0k for Nicolas. I haven't asked actually Embarassed
Please let us know if not.

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nicolas3141



Joined: May 25, 2007
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PostPosted: Tue Jun 02, 2009 3:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Brilliant - I'm flattered this stuff is considered worthy of stickiness. I was actually looking back through the archive for this thread so I could add to it. And whadya know it had been stickified.

Anyway, I just loaded another one - simple noise source:
http://electro-music.com/forum/topic-34745.html

These circuits are not meant to be highly featured and sophisticated, but are intended to be easy to build and understand for those starting out in sdiy. Good enough to be musically useful, but simple enough so that you can build them in a few hours and then get back to making that music. A bit like the MFOS Soundlab, but with a more modular approach (and a bit more emphasis on CV generation). I also try and only use readily available and easily substitutable parts.

Cheers,
Nicolas
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Pehr



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PostPosted: Tue Jun 02, 2009 3:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Your designs are really awesome in their simplicity.
And you use LM324, which I have tons of right now Very Happy

Added the noise and qoute.

Thanks

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nicolas3141



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PostPosted: Tue Jun 02, 2009 2:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

I use the LM324 for a couple of reasons. The main one is that it is one of the crappiest quad opamps out there and if my prototypes work with an LM324 the design should work with most other opamps as well. Secondly it is cheap and available everywhere and unlikely to become unavailable anytime soon. It also seems pretty rugged, while having lowish current consumption which makes it suitable for battery powered gear. And its inputs and outputs can go closish to supply voltages which is also good in the battery powered world.
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macumbista



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PostPosted: Tue Jun 02, 2009 6:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow! Cool! Thanks for these, I must have missed them earlier. Bonus points for thinking of battery operated stuff. We'll have to start a solar and wind-powered thread next Wink
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Dego



Joined: Apr 22, 2008
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PostPosted: Fri Jun 05, 2009 3:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Today I finished the ADSR and it works great. I am going to build your filter next. Smile
Looking forward to more of your designs Smile

The ones I have built so far:
VCLFO
LFO
ADSR
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nicolas3141



Joined: May 25, 2007
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Location: Christchurch, New Zealand

PostPosted: Fri Jun 05, 2009 5:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the feedback. It is really good to know people are finding this stuff useful. I am often posting these things after only building one prototype, so there is definitely scope for mistakes and it is very helpful if people reply to let me know whether they had any problems or not.

Thanks,
Nicolas
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parasat



Joined: Aug 13, 2009
Posts: 29
Location: chicago

PostPosted: Thu Aug 13, 2009 5:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Many thanks, nicolas. They might not be sophisticated and full featured,
but they're inspiring to me (and I'm sure to others, considering the current economic downturn).
It's hard to sock away enough for exotic components and PCB making when you're barely making rent...

Now what was that about a S&H and VCA? Smile

Cheers,
Parasat
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nicolas3141



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PostPosted: Mon Apr 12, 2010 3:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Parasat

It is now uploaded. Sorry for the delay, but it has been summer in New Zealand and I have been enjoying sol instead of solder Smile

http://electro-music.com/forum/topic-41277.html

Cheers,
Nicolas
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droffset



Joined: Feb 02, 2009
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PostPosted: Mon Apr 12, 2010 11:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey cool you're in New Zealand too, I never realized that. Thanks for these circuits Nicolas. Smile
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nicolas3141



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PostPosted: Thu Apr 22, 2010 5:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Another one:
http://electro-music.com/forum/post-292718.html

This is a very simple sawtooth VCO. Very low parts count, easy to build, easy to understand, but hopefully still a useful addition to your battery powered mini-modular.

Even though I am posting it after all that other stuff, it would make sense as a good starting point as a first project in sdiy.

Cheers,
Nicolas
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v-un-v
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PostPosted: Thu Apr 22, 2010 5:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Tres bien Nicholas!

I've updated the first post list too, so it's right there, when this page is opened. Very Happy

Tom

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droffset



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PostPosted: Fri May 07, 2010 3:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Should this one be added to the list? I haven't tried it yet though, maybe someone else has.
http://www.electro-music.com/forum/topic-38087.html

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v-un-v
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PostPosted: Sat May 08, 2010 12:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Eeek! From where did that muvaa spring? Looks like Nicholas' first post?

THX! I've added it to the list! Very Happy

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IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
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Pehr



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PostPosted: Sat May 15, 2010 2:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very Happy
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athleos



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PostPosted: Wed Jul 28, 2010 11:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Does anyone know of a really "simple" V/Hz keyboard controller circuit for these? There are a few around for 1V/Oct (MFOS comes to mind) but nothing more or less "simple" for the V/Hz crowd. I don't really need more than a CV out with Port/Glide if possible.

[edit] or is it possible to modify the ribbon controller for keys? possibly resistors in series etc...
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nicolas3141



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PostPosted: Sun Aug 01, 2010 2:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi

To adapt the ribbon controller to keyboard you would replace the ribbon with a whole lot of trimpots in series. Like this - http://electro-music.com/forum/post-303331.html#303331

Or see this similar, but more sophisticated and probably built and tested, circuit from Eric Barbour - http://www.cgs.synth.net/tube/controller.html

Cheers,
Nicolas
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athleos



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PostPosted: Mon Aug 02, 2010 4:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks so much Nicolas!! This is awesome! I'll let you know once I've got it built and tested!

Cheers,
Barry
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athleos



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PostPosted: Sat Aug 07, 2010 11:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey Nicolas, in that CGS controller schematic, would any components need to be changed when using a bi-polar 9V PSU or will it work as is? I'm just curious because your controller is missing the Gate out which would be useful for ADSR and Eric B's controller is rated for 12-15V.
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nicolas3141



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PostPosted: Sun Aug 08, 2010 2:02 am    Post subject: Reply with quote  Mark this post and the followings unread

should be fine. power the opamps from +/-9v and all the other grounds should be 0v.

cheers,
nicolas
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Ojd



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PostPosted: Thu Feb 03, 2011 1:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi there. Just wanted you to know, I finished my project (but still making some tweaks here and there). It is no exaggeration to say that you inspired me to do it. I though it would be impossible (I became very frustrated trying to take on something complex), but stumbling upon your thread here, on this forum, made me think that I was wrong. And some 5 month later I'm tweaking my own mini-modular! So thank you.

What it is:

Simple SAW VCO (2x) - [I think about upgrading though, V/hz seems really disappointing]

CGS DC Mixer (1x = 4 input)

2N3904 noise (1x) - [low level compared to VCOs, so no overdriven noise Sad ]

Poyvox VCF (1x) [really simple filter, 3 single opamps, 2 transistors, sounds harsh and metallic, I mean, no way i can get flute-like tone out of it (mellow moogalike sound), it really reminds me of soviet synths - it makes noise even if you don't need it]

LFO (1x) [Very nice modulation source, skew pot is essential]

Stupidly Wanderful Vactrol VCA (1x) [has its quirks, but stil HIGHLY USABLE]


modular01.mp3
 Description:
Little tune I made, well, to celebrate and glorify my new instrument. All was done with lfo doing something, recorded, then fit into tracks tempo. There was no way to preview what was going to be next note or anything, really sound on sound, or sound afte

Download
 Filename:  modular01.mp3
 Filesize:  2.2 MB
 Downloaded:  438 Time(s)

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marcelds



Joined: May 24, 2011
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PostPosted: Mon Feb 11, 2013 1:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

something i'd definitely salivate over would be a "best of nicholas" single PCB with several of the designs together. would love to see this happen but am personally really clumsy with pcb design... wow!
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