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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Modification to the new vari-clock 16 step sequencer
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Skrog Productions



Joined: Jan 07, 2009
Posts: 748
Location: Scottish Borders
Audio files: 87

PostPosted: Thu Jan 03, 2013 4:24 am    Post subject: Modification to the new vari-clock 16 step sequencer
Subject description: i missed this , ooops
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Hiya , Happy new year too all.

I've had a chance over the festive period to get to grips with the new sequencer ... http://www.electro-music.com/forum/topic-54288.html ....

For nearly all my music i clock all the analog sequencers externally from my hardware midi sequencer (yamaha RM1X) .

It seems the new internal / external selector switch allows an external clock to feed only the old sequencer but not the new vari-clock circuit , it is permenantly fed from the new master clock on the new pcb .

The new master clock circuit is clocking , from U6 pin12 to U5 pin4 DN & U7 pin 11 CLK also INH D8 cathode connects to U6 pin13 .


http://www.musicfromouterspace.com/forums.html?CATPARTNO=&PROJARG=SEQUENCER_VARICLOCK%2FSEQUENCER_VARICLOCK.php&MAINTAB=SYNTHDIY&VPW=1121&VPH=538


Is there a simple way to replace the master clock with an external clock via the panel clock switch ???


This could be a head scratcher , there is thick Scotch mist descended over my work bench already, fogging an obvious answer Smile

Dave.

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Skrog Productions



Joined: Jan 07, 2009
Posts: 748
Location: Scottish Borders
Audio files: 87

PostPosted: Thu Jan 03, 2013 7:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Getting somewhere now , tried this idea and it works Smile

Now the next problem .... as described in the documents , U7b halfs the master clock frequency & now also halfs the external clock, while clocking with the other sequencers it sounds obviously half as fast .

To save tampering too deeply with Ray's design , i've had a quick google and found a simple looking 4069 driven frequency doubler which i'll horse together on veroboard and try on the incoming external clock.

Dave.


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Skrog Productions



Joined: Jan 07, 2009
Posts: 748
Location: Scottish Borders
Audio files: 87

PostPosted: Sun Jan 06, 2013 5:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi again .

Possibly another oversight ..... I've noticed i can't get binary count led No.1 to light when set to 2steps , for testing purposes, using a 100k pot for selecting the quantised steps, at full CCW i get no led's = 1 step , good , then it goes to straight to binary led 2 = 3 steps , working fine beyond this , just seems to be 2 steps i can't select .
I've tried the scale trimmer in all positions but still can't get the pot to show led 1 , Led 1 works fine for all further binary combinations

Just this problem and doubling the external clock frequency and it will become a very good MFOS sequencer.

Need to read the schematics again , im a bit hazey on how the binary section is working.

Dave.

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dancelwerk



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PostPosted: Fri Jan 10, 2014 3:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Dave for your work trying to get the new circuit, i sure you will get.

Fernando.
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dancelwerk



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PostPosted: Fri Jan 10, 2014 3:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Take your time.
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