To use CEM or not.

[KA4HJH]

>This is what Tom Henry did in the PAL filter. He used a 4066 CMOS 
>quad bilateral
>switch, which has four independent voltage controlled single pole single throw
>switches.

Craig Anderton went one step further and added another SPDT switch 
for HP, as well as series/parallel switching and two timing caps per 
stage (1 decade apart). This was published as the "Multiple Identity 
Filter" in Keyboard. I've always wanted to see this done with analog 
switches (Craig's design is all mechanical and must use a mile of 
coax). I bought some 3320's but who knows when I'll get around to it

I could have sworn the Blacet Phasefilter did something like this, too.

Terry Bowman, KA4HJH
"The Mac Doctor"

ICQ: 45652354