[sdiy] EH frequency analyzer

[Tom Wiltshire]

On 8 Aug 2008, at 14:40, John Mahoney wrote:
>
> The Moogerfooger ring mod looks to be based on the LM13600. (Hey,  
> isn't the 13600 all but extinct? I wonder what Moog is using now in  
> these pedals. Maybe they've got a stockpile.)

National Seminconductor still have the LM13700 listed. I never  
understood exactly what the difference was supposed to be between  
LM13600/LM13700 ( was 13700 a later upgrade?) but they seem to be  
pretty much interchangeable.

T.

(http://www.national.com/mpf/LM/LM13700.html)