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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Single chip S&H
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EraSer



Joined: Apr 12, 2006
Posts: 82
Location: Italy
Audio files: 5

PostPosted: Tue Oct 17, 2006 2:03 am    Post subject: Single chip S&H
Subject description: how it works?
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I'm interested to know simply how SL' single chip sample&hold works befere adding it to my "under-construction SL" .Do I need a keyboard controller to use it Question
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fonik



Joined: Jun 07, 2006
Posts: 3760
Location: Germany
Audio files: 23

PostPosted: Tue Oct 17, 2006 5:15 am    Post subject: Reply with quote  Mark this post and the followings unread

no, you don't need a keyboard controller.
the s&h adds unpredictability to your SL. it takes an incoming control voltage (from noise, LFO...) and takes a sample by a time selected by it's integrated clock. it holds the sampled voltage until the next sample is taken. it outputs the sampled and held voltage and the clock trigger.
you can select the source (LFO, AR, Noise...) and the clock time.
so depending on clock setting and soure it will provide random CV or stepped CV...
hope that helps (may be a little confusing)

cheers,
matthias
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EraSer



Joined: Apr 12, 2006
Posts: 82
Location: Italy
Audio files: 5

PostPosted: Wed Nov 15, 2006 8:00 am    Post subject: sAMPLE&HOLD sp4t Reply with quote  Mark this post and the followings unread

Just a question:Could I substitute SP4T rotary switch with 3 SPST?
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fonik



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PostPosted: Thu Nov 16, 2006 2:05 am    Post subject: Reply with quote  Mark this post and the followings unread

you could but you probably won't because in case you select more than one input the control voltages will be added and not mixed which will result in too high voltages.
one solution would be to never select more than one source (not desirable, cos you may will select two sources by accident and the TL084 can't handle input voltages higher than 15V)
the better solution would be to add a simple mixer circuit based on a TL072... (you can add as much inputs as you want to)

cheers,
matthias
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EraSer



Joined: Apr 12, 2006
Posts: 82
Location: Italy
Audio files: 5

PostPosted: Thu Nov 16, 2006 3:38 am    Post subject: Reply with quote  Mark this post and the followings unread

So is the TL072 mixer circuit used to prevent from high voltages?
Can you tell me if this schem is right?
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Could I use 47kohm resistences?
thanks Matthias.


bye Matteo.
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fonik



Joined: Jun 07, 2006
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PostPosted: Thu Nov 16, 2006 3:54 am    Post subject: Reply with quote  Mark this post and the followings unread

you got it right and the 49k is a typo! you can use almost any value. 47k and 100k are the most common values for SDIY.

the ratio between the resistors at the input stages and the resistor in the feedback path of the OPA define the amplification. replacing the resistor in the feedback path of one of the OPAs by an 50k pot will give you an additional depth control/attenuation wich could be useful...

cheers,
matthias
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