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This topic comprises 3 pages: 1 2 3
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Author
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Topic: How low is too low for DTS LED Voltage
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Mike B. Smith
Film Handler
Posts: 82
From: Universal City
Registered: Nov 2004
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posted 05-16-2006 10:29 PM
How low can you go? Well it depends… There are variables that exist which can determine Timecode readability such as reader head alignment, LED voltage and even the print itself. It’s true some DTS players are better then others for continuing to read at lower voltages, particular the DTS-6 and 6D but to prevent possible playback issues DTS recommends adjusting the LED voltage to 4V. If this can not be achieved, don’t panic as an average you should not let it fall below 2V, this is a recommendation for all units, although as stated earlier some may play quite reliable below that voltage. Lately there has been some concerns over the early fall off of LED voltage. DTS is not ignoring this issue and has been conducting multiple tests with different LED’s and manufacturers for maximum performance. These tests do take time and unfortunately it is not as simple as placing a brighter LED in the head, this in itself can cause reading problems by over saturating the track. Many factors are involved with selecting a correct LED for use in a DTS Timecode Head. Recently DTS has qualified a new LED that is performing quite well, along with this; a new board design has just been completed that is also *RoHS compliant. This new improved head will automatically adjust to 4V on power up, if this voltage cannot be achieved, the green LED will blink on the Timecode head to notify you that service is needed. The blinking will only occur when film is not running, once playing the green LED will re-act the same as the older model heads.
*The RoHS Directive stands for "the restriction of the use of certain hazardous substances in electrical and electronic equipment". This Directive will ban the placing on the EU market of new electrical and electronic equipment containing more than agreed levels of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE) flame retardants from 1 July 2006.
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Bruce Hansen
Jedi Master Film Handler
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Posts: 847
From: Stone Mountain, GA, USA
Registered: Dec 1999
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posted 05-17-2006 06:43 PM
The reason behind RoHS has to do with the amount of electronics that is thrown away today. There is lead in the solder, and other parts. That lead gets into the ground water, that becomes drinking water. It has been proven that lead causes brain damage in children. If we wish to continue to be able to live on this little planet, we must start taking responsibly for our actions, and stop being stupid. Peoples lives are, and must be, more important than silly corporate profits.
One question about the auto adjust feature on the new reader, what happens if the unit is turned on with film in the reader? Would the adjustment fail?
BTW, I once tried slowly adjusting the gain pot in the DTS reader from one end to the other, and at no time did the DTS unit stop reading code (the green TC light did not go out).
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