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Author Topic: Supply Voltages for Cat. 150. Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 06-13-2007 03:13 PM                     I won the Dolby SA4 on Ebay recently, and it has just arrived; I collected it from the Parcelforce depot at lunchtime today. The two supply terminals on the back of the case are labeled +24V and -15V. However, the supply rails on the Cat. 150 card itself are labeled +24V and +15V. Should the 15V supply be positive or negative?  |  IP: Logged Christos Mitsakis Expert Film Handler Posts: 242 From: Ag.Paraskevi, ATHENS, GREECE Registered: Sep 1999 posted 06-14-2007 02:26 AM                     Stephen, Pins 16 and T are for +24V Pins 3 and C are for the +15V rail Pins 13 and P are for the -15V rail pin 9 is ground. I hope this helps. Christos  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 06-14-2007 03:40 AM                     Christos, thank you. That's odd, because there's only one 15V terminal, the negative one, on the SA4. Maybe the older cards didn't use +15V? Looks like I may have to run an extra wire to the card connector in the unit.  |  IP: Logged William Phillips Expert Film Handler Posts: 117 From: Cardigan, Wales, UK Registered: Feb 2002 posted 06-14-2007 01:18 PM                        Maybe the +15V supply is regulated down from the +24V supply. Most standard +15V regulators say the 7815 series can easily handle +30V or so. Plus it also cuts out the need for seperate positive supplys. Its pretty much common practice in linear PSUs to have the higher voltage and then drop it down to the lower ones( unless its really high ). Saves on heavy transformers and parts.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 06-14-2007 02:57 PM                        Looking at the SA-3 connections (page 7.22 of the CP-100 manual)(in manuals section) only +24 and -15 are connected. Of course, this is for the old cat 116a, not the 150 card. I believe they are plug compatible so I would try it without the +12 and see if all works well. Louis  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 06-14-2007 04:40 PM                     Thank you gentlemen, you were right. Louis, if you move on a few pages, to page 7.34, in the CP-100 manual it actually has the SA4 connections diagram. I'd looked in the manuals section for a SA4 manual, but there were only those for the SA5 and SA10. It hadn't occurred to me that in might be bound within the CP-100 manual, along with those for the SA2 and SA3.  |  IP: Logged Bill Gabel Film God Posts: 3873 From: Technicolor / Postworks NY, USA Registered: Jan 2002 posted 06-14-2007 05:51 PM                     Your SA4 came from a CP-100 install originally.  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 06-14-2007 06:08 PM                     Yes, I know it was designed to be used with a CP-100, but I didn't realise that the documentation for it was included in the CP-100 manual. It's rather like the MPU-1; which can be used with a CP-200 processor for example, but it has its own manual; it's not included in the CP-200 one.  |  IP: Logged

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