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Author Topic: led readers Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-20-2002 07:48 PM                     So far, no real complaints on the Component Engineering readers from me. I've used the 20, 30 and 40 series readers all with great success. I have no doubt that the Pana designed electronics on the Aussie readers may be superior though. Steve ------------------ "Old projectionists never die, they just changeover!"  |  IP: Logged Shaun Flichel Film Handler Posts: 42 From: Regina, Sask., Canada Registered: Sep 2002 posted 10-21-2002 05:08 PM                     The BACP is a good system, quick note from my experiences, if you get any kind of hum or any other noise, run a wire from the BACP's ground to some point of ground on the projector. Another thing thats very good to do is to have the LED switched with the motor via maybe a relay or however you want to do it, this way, your not burning the LED while your off screen. Example, if your theatre runs from 12 - 12 say, 4 shows a day, approx 7 hrs of actual running time, this leaves the LED on for 5 hours, almost half of the time it doesnt need to be.  |  IP: Logged Ray Derrick Master Film Handler Posts: 310 From: Sydney, Australia Registered: Sep 2001 posted 10-21-2002 05:33 PM                     Turning the LED off when not in use is a very good idea. However an even better way is to switch the LED to a very low current mode when not in use. This prevents the LED from cooling down completely. Most electronic equipment suffers reduced life because of the constant heating and cooling when it is turned on and off. It is the expansion and contraction of the physical structures that does the damage. LEDs are no different in this respect. You can add a low current mode quite easily to existing systems by placing a large value resistor in series with the LED when it is not in use. If the power supply is current regulated (as it should be) the resistor needs to be large enough to cause the supply to go into voltage limit mode. The ICS power supplies and I think maybe some of the later Comp Eng power supplies have an input to select low current mode. ------------------ Ray Derrick President/Chief Engineer Panalogic Corporation Sydney, Australia Phone: 61 (0)2 9894 6655 Fax: 61 (0)2 9894 6935  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 10-21-2002 05:36 PM                     Odessy Products has a switching board and interface card for CP500/650 which will switch off either analog or digital LED. Richard Fowler TVP-Theatre & Video Products Inc. here  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 10-21-2002 11:30 PM                    I switch off the digital LED's in my Kelmar basement readers when running analog or otherwise not in use. The power supply is actually separate (in the same housing) from the analog LED & pre-preamp supply so I just added switches to turn off the 120.  |  IP: Logged

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