Hurray a question! (slow weekend...)

[Grant Richter]

I have some personal observations about the LM13600/13700
datasheets in the National book.

It seems that the datasheet was assembled in a great hurry
and not targeted to the audio designer. Some of the designs
operate in the sub-audio range as shown. My guess is they
gave it to a brand new engineer as his first project and that
person just "winged" it.

Also, I think they just got a copy of the CA3080 datasheet
and transferred the filter designs to the datasheet without
checking them. Hence the familiar 100K, 200ohm input
attenuators which do not take advantage of the products
own features.

Don't trust datasheets too much, they often have errors,
and always read the fine print.

----------
> From: Tony Allgood <oakley at techrepairs.freeserve.co.uk>
> To: Synth DIY <synth-diy at node12b53.a2000.nl>
> Subject: Re: Hurray a question! (slow weekend...)
> Date: Monday, April 10, 2000 7:34 AM
> 
> Hi Juergen and all,
> 
> >Lot about it in the archives ...
> 
> I checked these already, and I found quite a lot of stuff, including a
> lot from me and you a couple of years ago. But not the basic reason why
> the manufacturer's apps don't contain the diodes for the filters, but do
> for the VCAs.
> 
> >Want clean until suddenly clips - use diodes. Want gradually increasing
> harmonics - don't use diodes.
> 
> This is true certainly. So I wonder if it is to do with the input pd
> range the filter will expect. VCAs have a top headroom defined, and we
> can all work with that. But filters have too many variables, so this
> makes the soft clipping more useful... and perhaps, more musical.
> 
> Regards,
> 
> Tony Allgood  Penrith, Cumbria, UK
> 
> Modular synth circuits, TB303 clone and Filter Rack
> 
> http://www.techrepairs.freeserve.co.uk/projects.htm
> 
> 
> 
> 
>