<DIV>I've always wondered about the capacitors that were used in the Prodigy, Liberation etc.- they looked like resistors but were caps! Any idea where to get them?</DIV>
<DIV>Best to All, Ken<BR><BR><B><I>Scott Bernardi <sbernardi@comcast.net></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Just what we need - another filter circuit. Anyway, I've always liked <BR>the CEM3320 filter chips, which has 4 transconductance stages which can <BR>yield any of the standard filter response (HP, LP, BP, and All Pass) in <BR>4th order, depending on how you interconnect the stages. I hit on the <BR>idea of using analog switches to do the interconnecting and build a <BR>switchable (not simultaneous) multimode filter. I previously built one <BR>with a CEM3320 that yielded BP and LP functions. The new circuit <BR>contains no CEMs but is built with LM13700 OTA's and MAX413 analog switches.<BR>The HP and LP functions work perfectly, just as I expected. The BP <BR>however doesn't seem to respond to the resonance settings as well as it <BR>should (and certainly not as well as the CEM3320 BP).<BR>Maybe some of you geniuses can take a look a make suggestions (make <BR>suggestions even!
if you
don't consider yourself a genius!).<BR>I've got to break down and build me another case. I've got a box full of <BR>loose modules without a home.<BR><BR>http://home.comcast.net/~sbernardi/elec/og2/og3_4pmultimode.html<BR><BR>-- <BR>Scott Bernardi<BR>sbernardi@comcast.net<BR><BR><BR></BLOCKQUOTE><BR><BR>http://www.macbethstudiosystems.com<br>Home of the M3X Analogue synthesizer...<p><hr size=1><font face="Arial" size="2">Want to chat instantly with your online friends? <a href="http://uk.rd.yahoo.com/mail/tagline_messenger/*http://uk.messenger.yahoo.com/"><b>Get the FREE Yahoo!
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