Camera Monitor from portable dual screen DVD player
Having used my Next Base DVD player for a blocking monitor, I have also been looking round for a cheap monitor, but without the DVD, Walking round my local Tesco superstore (groceries etc) I spotted a dual screen DVD player, normally used in cars,but works equally well at home.
Ideal because I can make use of the remote screen, while leaving the main player unit untouched, the remote can be powered from the cigarette lighter adaptor, the mains adaptor, or i could build a portable battery box.
The main use is for my camera boom, but can also be used as a blocking monitor when it's not possible to view the screen on my camcorders.
Here's the video
I was quite surprised at the quality of the image, and by the fact that it can be viewed at different angles, especially as the whole thng cost £70, which is much cheaper than the £130 I paid for the Next Base player without a remote screen, and even the cheapest (smaller) monitors i've seen are about £120.
If you're into photography, and your DSLR has a video output (like mine has), you can check the framing of the shot on a nice 7 inch portable monitor.
All I have to do is sort out a way to mount it on the boom or a tripod (need to fit a tripod mount on a backing board)
I found that the A/V plugs ate each end of the cable are different, one is longer, make sure you plug them in correctly or the monitor won't work.
I decided to go ahead and cut the AV cable, the monitor end is shorter than the player, then I fitted a strip of 3 RCA sockets to that end, this is because the cable on my camvorders and my DSLR have RCA plugs fitted, and is quite long.
The player end was fitted with 3 RCA plugs, I had to add tails to the plugs and do a bit of splicing, but the result is ok for me, with the plugs and sockets attached, I can still use this the same was as designed, but gives me an easy option to use the second screen as a video monitor.
The following images are of the connections for this device, and the way I connected the RCA's
I wanted to use the DC power cord to connect to a portable battery pack, but because the cord is wired direct I thought it may be a good idea to put a DC connector in the car adaptor case.
When I opened it, i thought the most i would see would be a 12V regulator (the DVD runs from 9-12V), but I found a DC to DC converter with a Mosfet, this takes up a bit of room, so I will be replacing that for a 7809 regulator just for over voltage protection, but will probably modify the circuit to add one or 2 diodes to raise the voltage to 10.4v, the diagram below shows you how, each diode adds about 0.7V depending on the diode.
I cut the cord and spliced it to another that has the right DC plug to connect to my battery, so when I finally install the regulator and matching DC connector in the car plug, the whole unit will still work as designed.