MOTM

Hi All !

Just cascading s/h's will not work :  opening 'em all up at the same 
time will just give you general drift :)  Inbetween one needs extra 
s/h's to keep the previous value stable until the value is aquired by 
the s/h that outputs it .  Look at how BBD's work, although in this 
case one could get away with much lower spec s/h's for the 
"inbetweeners" .

While i was typing the above, i was trying to remember where i saw 
such a circuit .... And here it is :

http://www.synthfool.com/diy/jhasr.gif

See the initials :  Juergen Haible :)

The cmos databook i have at hand (1977, where's my newer one ? :) ) 
does not give the 4098, but it's a dual monostable .  My guess is 
that here the last s/h gets triggered first, and then the "previous" 
one etc .  The logic circuit could be copied and applied to any bunch 
of s/h's i suppose .

How does the Serge do it ?

Bye for now .


Keep 'em oscillating :)


Hugo
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