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In Reply to: RE: Anyone have the Stellar Labs DT-1200 HD Television Tuner / Recorder with HDMI out? posted by louC on January 24, 2015 at 15:21:22:
The reason why there are five wires from the power supply to the main circuit board is because the main board requires three power inputs, which are +5 VDC, +12 VDC and -12 VDC. That would require six wires, but the +12 VDC and -12 VDC share a common ground, resulting in five wires. You need to make sure you only use regulated DC power supplies, because many wall wart supplies that say 12 VDC are unregulated. The output voltage of an unregulated wall wart depends on the load, so the voltage of an unregulated supply could rise to 15 volts or more and damage the main board, so be sure you use regulated wall warts. Also, be sure your 5 volt supply sources at least two Amps, and your 12 volt supply sources at least one Amp. Finally, use a power strip or connect the wall wart plugs together, because turning the wall warts on individually could damage the main circuit board. If you use individual wall warts, then you can use a simple wiring trick to eliminate the negative power supply, as explained later. Now, here is how I connected the wires: I don't know how to put a diagram on here, so I'll have to explain it in words. First, cut the ribbon cable going from the internal power supply to the main circuit board. Then, split out the individual conductors on the section of the cable going to the main board and strip the wire ends. This cable has five individual conductors that are identified by the following symbols. 1) blank, 2) long dashes, 3) X, 4) short dashes and 5) dots. Next, label and strip the wires going to the +5 and +12 volt wall warts and use wire nuts to connect the power supplies to the indivicual conductors of the cable going to the main board as follows: 1) +12V, 2) 12 volt ground, 3) 5 volt ground 4) +5 V and 5) +5 V. This wiring has been tested and it eliminates the need for a separate -12 V power supply, but don't ask me why, because I figured it out a long time ago and I've forgotten the reason why this works. Looking at it today, it seems like I should be using the 12 volt supply twice and not the 5 volt supply. But, these connections have worked for a year, so wire it up this way unless you want to experiment with a different connection scheme, or use a second 12 volt wall wart for the negative rail. .
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Follow Ups
- RE: Anyone have the Stellar Labs DT-1200 HD Television Tuner / Recorder with HDMI out? - Rotwang 18:36:08 01/24/15 (0)
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