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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
MFOS sequencer ext clock
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djrevmoon



Joined: May 05, 2009
Posts: 9
Location: almere

PostPosted: Mon Feb 27, 2012 5:18 am    Post subject: MFOS sequencer ext clock Reply with quote  Mark this post and the followings unread

Hi all,

I cant get the external clock input to work on my MFOS 16-step sequencer. If I short the input to ground, it will advance a step, but if I hook up an LFO (with a diode to cut out the neg part), it wont budge. R18 and R23 are the correct values, and the LFO gives a high enough voltage to trigger the clock. Any ideas?
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iopop3



Joined: May 28, 2010
Posts: 95
Location: Malmö, Sweden

PostPosted: Tue Feb 28, 2012 12:20 am    Post subject: Reply with quote  Mark this post and the followings unread

I think I read somewhere that the external clock needs to be near v+. An LFO would most likely put out a signal between +-5v. There used to be a schematic on how to adapt the input signal on the mfos site, cant seem to find it now.
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djrevmoon



Joined: May 05, 2009
Posts: 9
Location: almere

PostPosted: Tue Feb 28, 2012 3:44 am    Post subject: Reply with quote  Mark this post and the followings unread

iopop3 wrote:
I think I read somewhere that the external clock needs to be near v+. An LFO would most likely put out a signal between +-5v. There used to be a schematic on how to adapt the input signal on the mfos site, cant seem to find it now.


I'll check the output of the LFO, good call. Thanks!
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Juxwl



Joined: Nov 25, 2011
Posts: 6
Location: Iowa, USA

PostPosted: Sat May 12, 2012 10:17 am    Post subject: Reply with quote  Mark this post and the followings unread

I run my clock signal through a VCA and crank the gain up and it works great. The clock signal needs some pre amplification.
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djrevmoon



Joined: May 05, 2009
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Location: almere

PostPosted: Sat May 12, 2012 1:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

good idea, i'll try that.....
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NoizeToyz



Joined: Jan 09, 2010
Posts: 23
Location: Brighton
Audio files: 1

PostPosted: Thu Aug 02, 2012 3:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey!
How did you get on with this? I also have a question about the voltage needs of the ext clock input of the 16 Step seq;

I use the little Doepfer MSY2 to drive the sequencer in my SH101 (which works great), however it doesn't seem to drive the MFOS 16 Step. I guess this is something to do with it not outputting a strong enough voltage?

The manual says that the MSY2 outputs "... a periodic TTL signal (0/+5V) representing the tempo" - do you think this needs to be boosted to -/+ 15v ?

http://www.doepfer.de/pdf/msy2_man.pdf

Anyone got a little circuit that could do this?

Thanks!
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NoizeToyz



Joined: Jan 09, 2010
Posts: 23
Location: Brighton
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PostPosted: Thu Aug 02, 2012 4:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Just found this schematic on Ray Wilson's site - could this be the answer?
Seems to convert low voltage inputs (like line/instrument level) to gate (which I'm guessing is -/+12v

http://www.musicfromouterspace.com/forums.html?MAINTAB=SYNTHDIY&PROJARG=OLDIESBUTGOODIES/CONTROLLERS/audiotogate.html&VPW=1430&VPH=649
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NoizeToyz



Joined: Jan 09, 2010
Posts: 23
Location: Brighton
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PostPosted: Thu Aug 02, 2012 7:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Just had a reply from the man himself; Ray suggests this circuit to boost low voltage gates and clock sources.

http://www.musicfromouterspace.com/forums.html?MAINTAB=SYNTHDIY&PROJARG=HOT_TIPS/gate_buffer.html&CATPARTNO=
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NoizeToyz



Joined: Jan 09, 2010
Posts: 23
Location: Brighton
Audio files: 1

PostPosted: Thu Aug 02, 2012 10:51 am    Post subject:   Reply with quote  Mark this post and the followings unread

I just breadboarded that design above and can confirm it works for boosting the level between a Doepfer MSY2 (and the Doepfer A-190 Eurorack MIDI-CV Interface).

It also works with the Wogglebug LFO output (which it didn't before).
And I tested it with the square wave output of the Doepfer A-145 LFO - all good.

Nice.
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