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Author Topic: Dolby CP65 mute/fade time modification Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-18-2010 04:39 PM                     There is rumour that the CP65 mute/fadeout time can be modified (probably on CAT NO 443) by changing a resistor or capacitor. Does anyone have detailed info on this? - Carsten  |  IP: Logged Christos Mitsakis Expert Film Handler Posts: 242 From: Ag.Paraskevi, ATHENS, GREECE Registered: Sep 1999 posted 02-19-2010 12:30 PM                     On Cat243 its the R34 resistor value that controls the mute fade time. It should be the same resistor on cat443. It has been developed from cat243 and I don't think they changed that part. C.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-22-2010 06:41 AM                     Thanks - I'm going to check this out. - Carsten  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-22-2010 05:49 PM                     I found R34 on CAT443, but on first sight it doesn't seem to have anything to do with the Mute Timing. I will have to have a closer look at the circuit, though. Does anyone know how the Muting is accomplished on these cards? I have seen a few op-amps and Multiplexers on the 443 card. As far as I know, VCAs are used for leveling in the CP65. So I assume that the volume and Remote fader pots should lead into the same circuit area as the Mute circuit? - Carsten  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 02-26-2014 07:48 AM                 It has been 1464 days since the last post.  |  IP: Logged Christian Hove Film Handler Posts: 41 From: Aalborg, Aalborg, Denmark Registered: Jan 2012 posted 02-26-2014 07:48 AM                     Hi, Not being able to PM or email Carsten I revive this old thread. Hi Carsten, I would also like to modify the fade time of our CP65'ers. Did you find a way to do this?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-26-2014 09:41 AM                     Hmm, seems there is temporary trouble with the PM function. However, I just saw your PM in my profile. And no, I did not modify our CP65 for a longer fade time. But I guess we should be able to find the necessary information. There are quite a few Dolby buffs on the forum. Only info I have so far is that resistor R34, changed to 500kOhm, would produce around 7s of fade. On which CAT I don't know, but there are not too many choices ;-) - Carsten  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-27-2014 11:50 AM                     Sure it is CAT. No. 443 Did someone contact you privately about this? Oh, wow, there is an excellent zoomable picture of a CAT. No. 243 on ebay, readable down to component number. http://www.ebay.com/itm/DOLBY-CAT-243-CONTROL-LOGIC-spare-card-for-CP-55-Processors-/390371034623 Now who's able to find R34 or pinpoint any other regions that deal with the mute function/mute timing?? Hmm, strange, I can easily pinpoint R32,R33 (top middle), R35,36,37,etc. (bottom left), but I can't find R34... Ooops, I found it, right side, around a third from the top, R34,R94,C5,R12, IC3 in a row from left to right. I'll have a look at our real 443 later. I have never seen the two side by side. - Carsten  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 02-27-2014 01:16 PM                       The fade up time affects the fader. If too long the knob will turn faster than the audio can follow.  |  IP: Logged

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