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Author Topic: CP55 popping during format changes Paul G. Thompson The Weenie Man Posts: 4718 From: Mount Vernon WA USA Registered: Nov 2000 posted 11-18-2003 12:12 PM                     Thanks for the information, Steve. I can use that in the assistance of others who have the CP-55 should the situation arise. Your information is what I was looking for.  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 11-18-2003 01:55 PM                        As for the discrete thought, I thought that discrete VCA's consisting of two transistors/fets and a couple of resistors could serve the purpose just fine. such a circuit consumes little space and power. Another thought, are the muxes doing hard switching, or are they indeed crossfading. If they were not, couldn't you lengthen the time constant by adding capacitance to the control line , forcing it to crossfade? Josh  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 11-18-2003 03:01 PM                  Josh, Josh, Josh my very good friend, why put up with all that digital crap and the headaches? Just run optical and sell both the CP-55 and the DA-20 and buy something you enjoy.... Ummmm, how 'bout another motorcycle? >>> Phil  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 11-18-2003 03:28 PM                        Hmmm, you may have a point now phil, after all, I'm sure that damn card would make a lovely kickstand plate Josh  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 11-18-2003 03:42 PM                  Yes Josh, it would be "lovely".... >>> Phil  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 11-18-2003 05:27 PM                     Josh, For each input into the Mux, you would need a FET. You would also need the logic circuit to control the gate voltages and some additional capacitors and resistors (the time constant for raising/lowering the gate voltage will not necessarily be the same)...you are now up to some 8 FETs plus the resistors and the capacitors...compare that to the footprint of the CD4051...a 16-pin IC with an inhibit line. You need just a 3-bit binary control circuit that can be TTL level switching with the audio signals having a swing of 15 volts. As to the switching on the CD4051...it is pretty much instant (I think the switching time is in the nanoseconds). As to slowing down the logic...that won't help you...you would only be slowing down the reaction time of when you select until when it switches...once the prescribed level is reached...bang, it switches. Steve  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 11-18-2003 06:34 PM                        I seem to recall that the dual projector expander, cant remember who makes it, used a pair of muxes to crossfade the audio from one machine to another. How was this accomplished?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 11-18-2003 10:29 PM                     Using feedback circuits and/or controlling the charge on the in/out of the Mux you can effectively silence them. It just requires more circuitry and board real estate. Steve  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 11-28-2003 08:11 PM                  So Josh, WTF is the progress/final disposition? I have 758 customers that want to know the answer... Shall I just recommend they get a CP-200? How about a CP-65? Or a CP-500? Perhaps a 650? Or just junk it and get a bike? Or suggest that they just go to (hell) and get SDDS? Hope to see you again at xmas.... >>> Phil  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 11-28-2003 10:38 PM                     Simple solution buy a StarScope  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 12-01-2003 06:40 PM                  YooHOO! JOSH! WAKE UP! See above! Inquiring minds want to know all! Why are you ignoring us? And don't give us some lame excuse like "I've been busy", or "I'm bored", or "I'm only ignoring you", or "It's soooo cold here I froze my balls off", or...whatever! (as Adam would say) >>> Phil  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 12-03-2003 08:31 PM                  Ummmm...JOSH!!!!! SEE ABOVE and ABOVE! >>> Phil  |  IP: Logged Adam Martin I'm not even gonna point out the irony. Posts: 3686 From: Dallas, TX Registered: Nov 2000 posted 12-03-2003 09:29 PM                     Josh can't come to the phone right now, his tongue is frozen to the sign post out front.  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 12-03-2003 10:13 PM                  Adam, you mean the one that sez "Place Tongue Here"? >>> Phil  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 12-04-2003 09:23 AM                        Frankly, I vote for a CP 65, I've got a starscope. They suck Josh  |  IP: Logged

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