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Author Topic: Sound format automation question... Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 12-05-2006 12:24 AM                     I wanted to know if it would be possible to use the dowser open/close automation terminals to change sound formats. (non-sync to film and film to non-sync at the end of a show) The dowser feed could be attached to the sound format ground, the open dowser terminal to film, and close dowser terminal to non-sync. Is this possible?  |  IP: Logged Dominic Espinosa Phenomenal Film Handler Posts: 1172 From: Boulder Creek, CA. Registered: Jan 2004 posted 12-05-2006 01:00 AM                     Anything is possible however if you have a douser requiring current (as most do) you can't just pulse it from a sound change-over relay because those only close a ground loop in most cases. What kind of equipment are you working on? Douser, processor, automation?  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 12-05-2006 07:38 AM                     Just take 2 120volt relays and hook up the dowser open pulse to one of the coils and the close pulse to the other one. Then use the dry contacts to pulse the automation.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-05-2006 08:50 AM                     just make sure that it is dry contacts that one uses  |  IP: Logged Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 12-05-2006 12:55 PM                     I am using a Christie AM-3 automation and a Dolby CP55 processor.  |  IP: Logged Dominic Espinosa Phenomenal Film Handler Posts: 1172 From: Boulder Creek, CA. Registered: Jan 2004 posted 12-06-2006 02:36 AM                     Is the problem that the AM-3 doesn't pulse the sound and douser at the same time? It's got separate output terminals for both, right? Forgive my ignorance, but I don't see the actual problem?  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 12-06-2006 08:50 AM                     I don't think the AM-3 has the capability to pulse for sound format changes.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 12-06-2006 01:45 PM                        That is correct; that is why the 2 120v relays are needed. Louis  |  IP: Logged Dominic Espinosa Phenomenal Film Handler Posts: 1172 From: Boulder Creek, CA. Registered: Jan 2004 posted 12-07-2006 02:08 PM                     Ah, I misread the manual. My bad.  |  IP: Logged Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 12-07-2006 11:18 PM                     quote: Gordon McLeod just make sure that it is dry contacts that one uses How can the terminals be tested to make sure that they are dry contacts?  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 12-08-2006 12:46 AM                     The dry contacts are the ones NOT hooked up to the coil. You have the wiper in the middle. Then you have a set of contacts on either side. Hook the wiper to your ground on the automation switching on the processor. Then hook the normally open contact to the sound change (stereo, non sync,,etc...) The normally open contact is the one that the wiper is NOT making contact with when the relay is at rest (No power to it). Use one relay for stereo and one for non sync. Splice a wire from your C/O open pulse to one side of the coil on the relay and the other side of the coil goes to neutral. That is your stereo relay. Same for the other relay but use a wire from the C/O close pulse.That relay is for nonsync. Use 2 120volt AC relays  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-08-2006 09:56 AM                     Richard said "The dry contacts are the ones NOT hooked up to the coil" no a dry contact is one that has no voltage source present on it in effect it is a contact that is connected to nothing  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 12-08-2006 11:14 AM                     That is true but I'm just trying to make it simple for him to understand the contacts on the relay.  |  IP: Logged Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 12-08-2006 05:44 PM                     Ok, I understand why the use of the relays would be necessary. But, isn't it possible on some automations to use the dowser open close terminals to pulse the sound without the need of the relays. If you have no current hooked up to the dowser feed terminal then why would you need the relays. Basically, does the 120v AC come from the automation itself or from some sort of dowser power supply hooked up to the automation?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-08-2006 06:06 PM                     Some automations have dry contacts on the changeover and some are fed with power internaly  |  IP: Logged

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