HobbyKing E-OSD A very simple OSD (On Screen Display) for FPV users who want to see their 2 or 3 cell LiPo voltage level while flying. Very easy to install; runs in line with your battery and also your video-out wire.
Features: Voltmeter & Stopwatch Double Voltage Input Manual Calibration Programmable Display Content Supports NTSC & PAL Anti-Glare Shade Control Signal
Specifications: Weight: 3.3g Dimensions: 34 x 17 x 4mm Working Voltage: 7.2~12v
You can even do something easier.
You only connect the video signal to the OSD and make the 5V (red and black wires) of the VTX going directly to the camera.
And on the other side of the E-OSD you connect your model's battery.
Then no risk of burning your Camera or VTX.
You can run the OSD and Immersion off a 2S or 3S battery but you will need a 5V ubec to power the camera else you will burn it out (most ESC have a built in bec that supplies 5v power to ur rx that you can use)
I tried writing a review and it looks like it got blocked. FYI to everyone.
I bought two units, one worked fine on a standard quad and the second I tried linking up to a fatshark quad. I have usually powered devices through extra channels in the receiver which is how the first system is powered up and it looks like it works fine. The second however would not power up and I even payed special attention to protect my camera through volatage. I even swapped the second board to my first quad and it would not power up so I at least narrowed it down to the board. I then directly attached a 3s lipo to the voltage port and it finally powered up and I noticed it got pretty warm. So- the second unit would not power through the receiver but the first would- weird huh? So I spliced a red and black wire into the wiring system off the battery and it powered up and looked like it was going to work- however the heat of the osd was very apparent. I just let it do its think expecting a pop but the osd simply erased from the fatshark system. After letting it cool it would appear after powering up again but it would disappear. Not too happy with this product.
Why would you power a OSD on a receiver? If you have one battery you connect red and black on battery 2 port of the OSD. You split the video wire, from the cam one yellow to the vid in on the OSD and the other yellow to your video transmitter (video). Than split the ground wire from the cam, one goes to ground on the OSD and the other ground i connected to the lipo ground. Works great. I really don't have a clue why you are talking about the receiver and about your cam through voltage ( your cam power does't go through the OSD) ? If one was faulty than just send a video to HK support and iam sure they would send you a new one. I tested it on a 12 v cam and a 5 v cam with a Immersion 600w vid transmitter and no problems.
4 stars? I would agree. It's not horrible but not amazing. Simple to use though, and very simple to implement in any FPV system.
Just got mine. Works fine. It is worth the price. Pretty simple to monitor FPV pack battery or motor battery (if under 3S). There are some interesting projects to do RSSI monitor (check rcgroups). You have to to make a Y connection between camera wire and tx wire to the OSD (video input) i.e camera signal and tx signal going into video input on the OSD. Gnd can come directly from pack.