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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
CMOS ICs, buffered or unbuffered?
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defex



Joined: Jun 27, 2008
Posts: 36
Location: Toronto, canada

PostPosted: Wed Oct 19, 2011 11:48 am    Post subject: CMOS ICs, buffered or unbuffered? Reply with quote  Mark this post and the followings unread

I have ordered some MFOS ADSRs, and i was just wondering, some of the CMOS ICs come in buffered and unbuffered versions, does it make any difference which one i get?
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Mongo1



Joined: Aug 11, 2011
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Location: Raleigh NC

PostPosted: Wed Oct 19, 2011 2:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Which parts are you talking about specifically?
I built one of those ADSRs a while back, and didn't order anything special.

Gary
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defex



Joined: Jun 27, 2008
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Location: Toronto, canada

PostPosted: Wed Oct 19, 2011 2:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

the CD40106 hex Schmitt trigger comes in buffered and unbuffered versions, at the same price, i was wondering because i built something a while back and the instructions said to only use the unbuffered one.
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Mongo1



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PostPosted: Wed Oct 19, 2011 2:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I have ordered some MFOS ADSRs, and i was just wondering, some of the CMOS ICs come in buffered and unbuffered versions, does it make any difference which one i get?



Hmmm, generally buffering just means it has a higher output current capability, so I'm thinking that's what you probably want.

Was what you were building before something like an oscillator or other wacky lunetta stuff? I could definitely see how something like that might want to use an unbuffered version.

Gary
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Mongo1



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PostPosted: Wed Oct 19, 2011 2:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's an article about buffered vs unbuffered CMOS
http://www.ti.com/lit/an/scha004/scha004.pdf

Gary
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Blue Hell
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PostPosted: Wed Oct 19, 2011 3:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Unbuffered is special enough to be explicitly mentioned usually ... usually you'll want buffered.

For certain analog trickery with CMOS unbuffered can be used.

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defex



Joined: Jun 27, 2008
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Location: Toronto, canada

PostPosted: Wed Nov 02, 2011 6:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

I think i remeber what the thing is that wanted certain unbuffered CMOS, it was the CGS wasp filter. (which i still haven't finished)
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