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 Forum index » DIY Hardware and Software » The layout factory
MS-20 (LM-13700 version),Polivoks or EMS VCF on veroboard?
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Snaper



Joined: Feb 28, 2014
Posts: 202
Location: Hungary

PostPosted: Wed Mar 04, 2015 8:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thelonious wrote:
Ok thanks snaper.
I finish my layout.
I made 2 versions, one "normal" and one with hoyager's mods.
But I have some questions.

For the "normal" version :
What is the value of C4.1 ?
Switch A1 and A2 are connect to ground, and A3 without connection ?
The DPDT is ON-ON (B1 is Lowpass input, and B3 is Highpass input) ?

For the hoyager version :
Don't understand this : "use an 8.2k resistor from the res3/out to the lug 3 of res pot (as per ms20) " ? (It's a bit confused)
And this : "add a 47k resistor from the hi pass input (gnd end of C4) to gnd ." ? (If I understand, he want to put a 47k in serie with C4 before to go to ground).

I can send you my layouts if you want.
Thanks

What schemo are you using?
By the way, Ive ended up etching a schmitz PCB when I was building this Wink
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Thelonious



Joined: Mar 03, 2015
Posts: 5
Location: France

PostPosted: Fri Mar 06, 2015 2:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

I used the Rene schmitz' shema with Fazh0r layout for the LP/HP switch, this one :
http://www.schmitzbits.de/ms20.html

And I made a version with the hoyager' mods.

Just what the value of C4.1 on Fazhor layout connected to SWB3, 1nF ?
And end of C4, are connected to ground and SWA1 ?
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Snaper



Joined: Feb 28, 2014
Posts: 202
Location: Hungary

PostPosted: Fri Mar 06, 2015 9:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

If Im correct that seitch is gor the Lp/Hp mod, so that cap should be 1n.
http://www.analog-synth.de/synths/mod2/ms20filter/ms20filter.htm
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Thelonious



Joined: Mar 03, 2015
Posts: 5
Location: France

PostPosted: Mon May 18, 2015 2:07 am    Post subject: Reply with quote  Mark this post and the followings unread

I made first the version of hoyager. Very bad mod, sound very crappy, don't follow it.
So I made the "original" version with LP/HP, works very well. I would like the resonance oscillates.
What can I change to have more resonance?
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Thelonious



Joined: Mar 03, 2015
Posts: 5
Location: France

PostPosted: Tue May 19, 2015 2:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's ok, I found the solution, that was writes in a post above
That was just a problem with the input level. With a low input signal, the resonance oscillates perfectly.
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isak



Joined: Dec 13, 2009
Posts: 840
Location: Israel
Audio files: 18

PostPosted: Tue May 19, 2015 3:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Thelonious.

Quote:
So I made the "original" version with LP/HP, works very well. I would like the resonance oscillates.


can you please share the board of the LP/HP?

cheers,
Isak E.

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http://www.myspace.com/mgmtrance
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Snaper



Joined: Feb 28, 2014
Posts: 202
Location: Hungary

PostPosted: Tue May 19, 2015 7:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

isak wrote:
Hi Thelonious.

Quote:
So I made the "original" version with LP/HP, works very well. I would like the resonance oscillates.


can you please share the board of the LP/HP?

cheers,
Isak E.

Im interested too;)
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mfc83



Joined: May 21, 2015
Posts: 1
Location: Berlin

PostPosted: Thu May 21, 2015 10:20 pm    Post subject:   Reply with quote  Mark this post and the followings unread

Snaper wrote:
isak wrote:
Hi Thelonious.

Quote:
So I made the "original" version with LP/HP, works very well. I would like the resonance oscillates.


can you please share the board of the LP/HP?

cheers,
Isak E.

Im interested too;)


Another interested party here. Would love to build this!
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bamboombaps



Joined: Oct 23, 2015
Posts: 60
Location: Glasgow

PostPosted: Sat Nov 21, 2015 2:42 am    Post subject:   Reply with quote  Mark this post and the followings unread

me three
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abelovesfun



Joined: Dec 17, 2012
Posts: 40
Location: Portland, OR

PostPosted: Mon Oct 31, 2016 2:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here is my update of the Ms.20 with HP and LP.
http://aisynthesis.com/wp-content/uploads/2016/10/MS20.pdf

Almost ready for production, I have the following to troubleshoot:

1. Re-introduce a 10k input resistor to the input, and a 220r to ground, as in the Rene circuit. At overly hot levels, the filter distorts and acts irregular.

2. Should C10 be elctrolytic with the + facing "output?" Currently the filter "thumps" out when switching between hp and lp sometimes, requiring the cutoff to change before it kicks back in.

3. Confirmation of orientation of the two BC558s - I think this is not quite right...

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Experimental and modular music at: https://soundcloud.com/she-suburban-heroin-electronics

I make Eurorack DIY Kits (pcb and or panels also available): aisynthesis.com
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