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Author Topic: Pdb supplies  (Read 707 times)

Offline trebor

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Pdb supplies
« on: April 17, 2017, 10:04:05 »
I have one of these Menace Rc PDB XT60 5V 12V Power Board http://menacerc.co.uk/product/pdb-xt60-5v-12v-power-board-pcb
Now I need to run from the 5v a Fc, Microminiosd, 2 small 9g servos. Not sure what the servos pull but am I asking too much ? I don';t even know how much the 5v board will handle. Will I be ok or should I get another 5v reg ?

Offline pheasant_plucker

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Re: Pdb supplies
« Reply #1 on: April 17, 2017, 12:47:01 »
They don';t provide enough information about the regulators specifications. Can you read the numbers off the regulator chips on the one you have?
A fu?l sizero standard servo can draw 1 amp when stalled. A 5g should be nowhere near this.

Gerry
The man serving me in the canteen said "Look, You can see the face of Jesus in the Margarine" The Asian guy next to me replied "I can't believe it's not Budda"
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Offline dirtyharry

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Re: Pdb supplies
« Reply #2 on: April 17, 2017, 13:05:59 »
I';d guess your pulling around 1a in total. The components will probably take it but they will also get hot.

Its a linear voltage regulator so any extra voltage has to be "burnt off". On 4s your going to roughly have a 10w heater slowly cooking away, wouldn';t last long in a foamy plane but may be ok in a quad.




Offline trebor

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Re: Pdb supplies
« Reply #3 on: April 17, 2017, 13:57:36 »
It';s on a foam flying wing running a 3s battery so I don';t want it to get too hot !! You got me worried now 😀

Offline dirtyharry

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Re: Pdb supplies
« Reply #4 on: April 17, 2017, 15:48:50 »
I just use a regular bec on a wing , their very reliable and can run at 2A+ all day without any heat issues.

Any 12v stuff like  camera/tx run direct from the 3s battery , if you get video interference lines use a ferrite ring and capacitor.

http://www.ebay.co.uk/itm/3A-UBEC-5V-6V-Full-Shielding-Antijamming-Switching-DC-DC-Regulator-New-UG-/122450479235?hash=item1c829e0883:g:hxkAAOSw~OVWvy3a

Offline trebor

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Re: Pdb supplies
« Reply #5 on: April 17, 2017, 17:08:35 »
They don';t provide enough information about the regulators specifications. Can you read the numbers off the regulator chips on the one you have?

Gerry
From what I can see it looks like :- m8mosb    gk142549

Not being electroniclly trained but what';s the difference between this voltage regulator and the Bec ?

Offline dirtyharry

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Re: Pdb supplies
« Reply #6 on: April 17, 2017, 20:23:00 »
a linear one ( like you';ve got ) is like a restriction in the wire , it burns off the excess to give a nice smooth output. It often needs a heat sink.

The switching Regulator I linked to works by chopping up the electrickery and glues it back together at a lower voltage , very efficient + cool but noisy. The noise can be removed with capacitors/ferrite rings and a shield ( like the one I linked to already has)

Offline trebor

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Re: Pdb supplies
« Reply #7 on: April 17, 2017, 20:25:07 »
Thanks for that, learnt another lesson ! 👍

Offline Hozza

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Re: Pdb supplies
« Reply #8 on: April 18, 2017, 10:22:18 »
The voltage regulators on the Menace PDB are 0.5amp

Offline trebor

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Re: Pdb supplies
« Reply #9 on: April 18, 2017, 10:29:30 »
Oh heck ! I wish I could plan these builds better 😢

Offline trebor

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Re: Pdb supplies
« Reply #10 on: April 18, 2017, 10:57:01 »
Maybe I should use this as its rated at 5v / 3amp. Then all I would need is a 12 reg for my vtx and camera supply in case I put a 4s in.

Offline Hozza

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Re: Pdb supplies
« Reply #11 on: April 18, 2017, 11:03:42 »
http://www.hobbyrc.co.uk/matek-hubosd-eco-h-type-pdb

I';m putting one of these on my S800 all the power I need and I like the idea of seeing the mAh used to I can maximize my flight time.

Offline trebor

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Re: Pdb supplies
« Reply #12 on: April 18, 2017, 12:39:07 »
That looks like a good idea, my plans fell short twice now. I got one of these http://www.hobbyrc.co.uk/frsky-xsrf3e-f3evo-flight-controller-eu-lbt
Thought I';d keep things to a minimum but the pin connections are tiny I might have been better just getting a naze32. I have a spare Microminiosd so I';m going to use it to get rid of it from my box of bits. Trouble is there is so much to chose from now it';s doing my head in. 😄

Offline trebor

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Re: Pdb supplies
« Reply #13 on: April 20, 2017, 11:59:25 »
http://www.hobbyrc.co.uk/matek-hubosd-eco-h-type-pdb

I';m putting one of these on my S800 all the power I need and I like the idea of seeing the mAh used to I can maximize my flight time.

Do you need a special config tool for that osd ? Would you be able to use an Ftdi tool or can you get to it through cleanflight / base flight. Only asking as I';m a numpty 🤔

Offline Cheredanine

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Re: Pdb supplies
« Reply #14 on: April 20, 2017, 13:27:17 »
You can ask mike at hobbyrc but pretty sure the matek hubs all use minims which will mean you need an ftdi adaptor

Offline trebor

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Re: Pdb supplies
« Reply #15 on: April 20, 2017, 15:51:26 »
Cheers, one day I might know what I';m doing 😄

Offline Hozza

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Re: Pdb supplies
« Reply #16 on: April 20, 2017, 16:23:01 »
You can ask mike at hobbyrc but pretty sure the matek hubs all use minims which will mean you need an ftdi adaptor

I use one of these as my FTDI didn';t work, different chip I believe
www.banggood.com/CJMCU-CP2102-USB-To-TTLSerial-Module-UART-STC-Downloader-p-970993.html

and all the info on the OSD is here: http://www.stosd.com/

Offline trebor

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Re: Pdb supplies
« Reply #17 on: April 20, 2017, 18:16:52 »
I got a Ftdi confi thingy for the Microminiosds, sod it more stuff to buy !!  Just had a look, USB ttl adaptor seems similar to the Ftdi thingy but maybe not.
« Last Edit: April 20, 2017, 18:28:11 by trebor »