New Micro MinimOSD

[BlueFlyer]

Why is it too late to install a dedicated BEC? They're cheap and small. OK, it might mean some disassembly of your quad but surely that's worth it if it means avoiding a potential crash or failure of one of your 5v dependent systems.

I think you're looking for an easy way rather than the proper way.

[jweaver]

Why is it too late to install a dedicated BEC? They're cheap and small. OK, it might mean some disassembly of your quad but surely that's worth it if it means avoiding a potential crash or failure of one of your 5v dependent systems.

I think you're looking for an easy way rather than the proper way.

I am indeed looking for an easy way.. Its only a little 250.. if it were my Discovery, I would be willing to do a lot more.

The reason it would be difficult for me is that I am using a PDU:

http://www.banggood.com/NAZE32-Integrate-PCB-Board-Power-Distribution-Board-For-QAV250-ZMR250-Quadcopter-p-989404.html

So all of my connections are done via headers, connected to the PDU.

To change the power, I would have to completely strip the quad and either cut some tracks on the PDU, or remove headers.. And its a lot of work.. I would rather not fit the MinimOSD if this was my only option.

I am still not sure I understand why its a bad idea.. I get the idea that it is bad, but the more I think about it, I don't know why.

Thinking about an old school AV setup, with composite video.. You didn't think twice about connecting a Sky box, to a VCR to a TV, all of which are powered by separate PSUs.. Or even connecting a Video Camera to a VCR, one powered off a PSU, the other batteries.

Other than potential interference, none of the devices blew up, or caught on fire.

So why exactly is there a problem, having different devices all running off different supplies.. I guess one concern is if the various 5v circuits touched, I can see that being a problem. But if the OSDs power was insulated and isolated from other 5v feeds, I am not sure I understand the issues.

At the end of the day, my camera and TX are powered from the battery.. And the Naze and RX are powered by an ESC BEC.. So thats 2 sources already..

Jon

[Hawkview]

Micro minimosd is very voltage sensitive I have powered it from the flight controller which was powered from a 2amp ESC bec and it would drop the OSD if I want above half throttle due to voltage sag,plus powering from a ESC bec can put noise into video.
Micro needs a regulated 5v I would power from a small bec.
I have done this with a separate bec powering flight controller GPS rx and OSD, all good no drop off OSD and no noise in video

[jweaver]

Micro minimosd is very voltage sensitive I have powered it from the flight controller which was powered from a 2amp ESC bec and it would drop the OSD if I want above half throttle due to voltage sag,plus powering from a ESC bec can put noise into video.
Micro needs a regulated 5v I would power from a small bec.
I have done this with a separate bec powering flight controller GPS rx and OSD, all good no drop off OSD and no noise in video

Cheers.. So just leave everything else as is.. And get a small BEC to power the MiniOSD?

What sort of current? 1A? Or 2A? Had a quick scan and the "mini" ones are more expensive than the MiniOSD.. Any recommendations as to what you used?


Jon

Edit: Actually, this looks OK.

http://www.banggood.com/DC-DC-Converter-Step-Down-Module-3A-5V12V-Mini-BEC-For-RC-Plane-FPV-p-936792.html

[iPeel]

Edit: Actually, this looks OK.

http://www.banggood.com/DC-DC-Converter-Step-Down-Module-3A-5V12V-Mini-BEC-For-RC-Plane-FPV-p-936792.html

Search eBay for "MP1584" and you can probably buy one or a pack of 5 from the UK much quicker, just without the wires and the heatshrink. You'll need to set the voltage using a volt meter and the little potentiometer. I guarantee that's what's lurking beneath that heatshrink.

[jweaver]

Search eBay for "MP1584" and you can probably buy one or a pack of 5 from the UK much quicker, just without the wires and the heatshrink. You'll need to set the voltage using a volt meter and the little potentiometer. I guarantee that's what's lurking beneath that heatshrink.

Cheers.. I didn't think to search "DC-DC".. I never really like the idea of the ones with pots, as they could get knocked out of adjustment.. All of the ones i have used before have been set with fixed resistors.

But I don't really want to wait and will have a crack with one of those.

Thanks.

[iPeel]

Cheers.. I didn't think to search "DC-DC".. I never really like the idea of the ones with pots, as they could get knocked out of adjustment.. All of the ones i have used before have been set with fixed resistors.

But I don't really want to wait and will have a crack with one of those.

Thanks.

I always use a dab of hot glue on the pot once it's been set, but I bet those ones on BangGood plus a whole lot more have the pots on them with nothing but heatshrink holding them in place.

[martynv]

I've got my MicroMinimosd powered off one of the unused ESC Bec outputs on my 250 and it seems fine just as long as the grounds are all the same. As mentioned a seperate Bec would probably be better as there's less risk of noise on the video.

[CurryKitten]

Does that PDB frame thingy not have a 5v to power everything through instead of using the ESC's BEC ?

On mine original 3s based 250, everything is running off the BEC on a single ESC, but I'm very much in the try-it-and-see-if-it-explodes camp.  My 4s quad (which is still in build after a long time) does use a seperate PDB with a 12v/5v BEC on board to power the rx/naze/osd - but that's mainly because the ESC's are opto's

[jweaver]

Does that PDB frame thingy not have a 5v to power everything through instead of using the ESC's BEC ?

On mine original 3s based 250, everything is running off the BEC on a single ESC, but I'm very much in the try-it-and-see-if-it-explodes camp.  My 4s quad (which is still in build after a long time) does use a seperate PDB with a 12v/5v BEC on board to power the rx/naze/osd - but that's mainly because the ESC's are opto's

Yes and no.. The PDB doesnt have a BEC onboard. Instead it simply takes 5v ONE of the ESCs and uses that to power the entire quad.

This means that the 5v output of the other 3 ESCs go nowhere and are not used.

One thing i am considering. I could install a BEC and connect it to the PDB on the ESC input which is currently used for power..

This way, none of the ESCs would be used for power and a more poweful BEC could provide more power than i need.

I am going to do a few experiments to see how that goes...

Jon