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crazeydazey
Joined: Feb 15, 2007 Posts: 303 Location: England
Audio files: 4
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Posted: Wed Oct 10, 2007 5:05 am Post subject:
Op Amp question |
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Hi,
Sorry if this is a numpty question or has already been asked before, but is there any difference between the LM13600 and the LM13700.
I have had a VERY quick look through the datasheet.
It's just that I've noticed some people tend to use one and some use the other.
Ray (MFOS) - LM13700
Tom (EFM) - LM13600
but the circuits (filters) look very similar.
One of the reasons I'm asking is because I wish to have a go at some of Toms filters (Korg Delta, MS20, EMS Diode ladder etc) but I find it easier to get LM13700's, So I thought I might use these.
Is that a no no???
Cheers
Daz |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Oct 10, 2007 9:10 am Post subject:
Re: Op Amp question |
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crazeydazey wrote: | Sorry if this is a numpty question or has already been asked before, but is there any difference between the LM13600 and the LM13700. |
The OTA sections are the same. There is a bit of difference in the buffers. (IMO you should never use the buffers, anyway.)
Ian |
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Dave Kendall
Joined: May 26, 2007 Posts: 421 Location: England
Audio files: 3
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Posted: Thu Oct 11, 2007 6:02 am Post subject:
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Hi
From memory, according to posters on the old EFM list, the 13600 sounds better in the VCF2F (moog ladder), and in the Wildcat VCF of the same type.
I couldn't hear a significant difference using 13700 or 13600s in the VCF6C diode ladder.
Daz - if you're *really* stuck for 13600s, PM me. I may be able to spare a few for trade or whatever.....
cheers,
Dave |
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Serenadi
Joined: Jul 03, 2007 Posts: 89 Location: Germany
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Posted: Thu Oct 11, 2007 11:49 am Post subject:
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Dave Kendall wrote: | ... the 13600 sounds better in the VCF2F (moog ladder), and in the Wildcat VCF of the same type. |
I *think* that this is the same old story of people who are able to "hear the weed growing" as we say it here in germany.
Like frijitz posted - the difference lies in the output buffer.
And I agree, not to use this buffer at all.
13700 and 13600 are both bad.
They sound ok - so far, but the offset voltage is imho too large.
Better use the good ol' CA3080 with a separate trimpot to reduce offset, if this is an item.
However, if the item is sound, I prefer modern VCA's like SSM2164. |
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