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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
protecting the baby
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spippoli



Joined: Nov 23, 2008
Posts: 19
Location: Italia_pizza_mandolino

PostPosted: Sun Nov 23, 2008 3:47 am    Post subject:  protecting the baby
Subject description: input/output protection
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Hi all,
I'm planning the construction of a full patched soundlab plus, and as I've been taught I've always practiced safe sex... so I'm considering protecting inputs and outputs

For logic inputs I'll follow what master Ray explained here:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
while if I understood correctly cv inputs needs not to be protected due to their high impedance, right?

Is there a way to protect outputs? I mean something that saves my soundlab if I accidentally connect outputs to outputs.

Another thing I'd like is to sync the S&H to an external clock. Would a swithced jack in series between lf444:1 and c1 do?
The schematics of the S&H is this one http://www.musicfromouterspace.com/analogsynth/SOUNDLABMINISYNTH_PLUS/pdf/microsampleandhold_schem.pdf
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seraph
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Joined: Jun 21, 2003
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PostPosted: Sun Nov 23, 2008 4:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi spippoli Shocked
welcome to electro-music.com Exclamation
what a great screen name (from an Italian point of view) well done

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richardc64



Joined: Jun 01, 2006
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PostPosted: Sun Nov 23, 2008 11:42 am    Post subject: Re: protecting the baby
Subject description: input/output protection
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spippoli wrote:
Is there a way to protect outputs? I mean something that saves my soundlab if I accidentally connect outputs to outputs.


As long as outputs have a series resistor, like R21 at the bottom of the schematic, no damage should result from connecting outputs together. In fact, doing so can produce a useful result when applied to a module's input, as the two (or more,) signals will be averaged, which will have a different effect than connecting each to separate inputs of a module, where signals are (typically) summed.

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spippoli



Joined: Nov 23, 2008
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PostPosted: Tue Nov 25, 2008 2:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Seraph, and thanks richard for the reply!

Any idea for the S&H mod?
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richardc64



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PostPosted: Tue Nov 25, 2008 4:22 am    Post subject: Re: protecting the baby
Subject description: input/output protection
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spippoli wrote:

Would a swithced jack in series between lf444:1 and c1 do?


Off hand, I'd say yes, but it's not clear to me how large a pulse is needed to trigger Q1. Try it, but put a resistor 470ohm-1K between U1A ouput and the jack switch terminal.

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