[sdiy] LM13600/13700 Practical Difference in Filters?

[Karl Dalen]

Besides, there is a significant resonance responce depending on the
limiting diodes used, the difference between stacked Bat43 and 1n4148
are quite significant! (MS20 filter). Bat 43 has low forward voltage.

KD
 

--- Harry Bissell Jr <harrybissell at prodigy.net> skrev: > The LM13600 has
output buffers that have a bias
> from Gm pin to the darlington buffer. This will
> allow improved operation at very small
> transconductance
> but might make a thump if the Gm bias current
> changes suddenly.
> 
> The 13700 is fixed biasd for "middle of the range"
> applications... so it won't thump due to changes in
> Gm bias current (but might indeed thump for offset
> voltage chnage with bias, anyway)
> 
> If you are not using the buffers there is no
> difference.
> From a practical standpoint I have never *noticed*
> a difference.
> 
> TomG once reported that one of his EFM VCO designs
> based
> around the 13600 did not work correctly with the
> 13700..
> that's the only case I've heard of
> 
> H^) harry
> 
> 
> 
> --- Ken MacBeth <macbeth2600 at yahoo.co.uk> wrote:
> > Hi List!
> > I wonder if any one can help on this one. What is
> > the difference in using an LM13600 and a LM13700 in
> > say the MS20 filter or in a State Variable- can the
> > they swapped around? I know that there is something
> > to do with the output buffers, but that's it!
> > As always, any help appreciated. I wish I knew more
> > than I do!
> > Regards, Ken
> > 
> > 
> > 
> > 
> > http://www.macbethstudiosystems.com
> > Home of the M3X Analogue synthesizer...
> > 
> > ---------------------------------
> > Want to chat instantly with your online friends? Get
> > the FREE Yahoo!Messenger
>  

Yahoo! Mail - Gratis: 6 MB lagringsutrymme, spamfilter och virusscan. Se mer på http://se.mail.yahoo.com