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Power Safe for any receiver

Add on gadget for a better battery connection

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Harry Curzon19/08/2018 11:25:58
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Posted by Chris Bott - Moderator on 19/08/2018 10:40:12:
Does anyone know where they're available from?

Well, the fact it was a link to Nexus Models was a bit of a hint smiley

They also make one for the Futaba 7008 rx. Afaik they were only ever made for certain Futaba Rx which were giving people problems with their signal output voltage, but if you remove the signal boosting bit of the electronics then the general concept of keeping the servo currents outside of the rx is valid. A simpler way is to just plug a second battery into an unused servo socket or Y lead a second battery into a used servo socket, at the opposite end to the battery socket, then the current demand is shared over two plugs and spread over two ends of the pcb tracks.

If you prefer to isolate the two batteries from each other, use a battery backer such as Jeti V cable

**LINK** or

**LINK**

or posher still with magnetic switch **LINK**

Ron Gray19/08/2018 11:32:37
1425 forum posts
358 photos

Optipower Ultra Guard for intelligent battery redundancy.

 

Edited By Ron Gray on 19/08/2018 11:34:46

Chris Bott - Moderator19/08/2018 12:05:42
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Posted by Harry Curzon on 19/08/2018 11:25:58:
Posted by Chris Bott - Moderator on 19/08/2018 10:40:12:
Does anyone know where they're available from?

Well, the fact it was a link to Nexus Models was a bit of a hint smiley

I meant where are the precision connectors available from..

Chris Bott - Moderator19/08/2018 12:15:48
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I'm liking all these suggestions that are coming in.

The Jeti V cables look handy to at least use two servo plugs into a Rx. That's possibly all we need to increase the current handling of our power connection. It does however use up two Rx ports.

The same idea could easily be incorporated into a Y cable that feeds one of our units built with a single XT30 input.

The optipower Ultra Guard looks another good idea. As far as I can see it only connects to the Rx with one plug, so that doesn't help with the main reason for our plug in unit. But it does cover us if we have a battery problem in flight. One question - does it alert us to the fact that it has taken over?

Bob Cotsford19/08/2018 12:18:04
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£58 for Futaba fittings - isn't that getting away from Chris's initial idea of a cheap and simple universal power bus?

Mike Blandford19/08/2018 13:19:03
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Try these (should be available with different number of connections) **LINK**

Preci-Dip part 801-87-036-10-001101 is a 36 way version where you may "snap off" however many connectors you need. Clearly, these may be available from elsewhere (found them at Digikey as well as Farnell).

I measured the (square) pins on a FrSky Rx (X8R) as 0.6mm (digital caliper), and the pdf file for these shows 0.635 as the square pin size that fits. For round pins it shows 0.7mm to 0.9mm. 0.635mm square is 0.898mm across the diagonal, so I reckon a 0.5mm square pin (diagonal 0.7mm) would also fit, so should be fine for 0.6mm.

Mike

Edited By Mike Blandford on 19/08/2018 13:19:35

Ron Gray19/08/2018 13:21:09
1425 forum posts
358 photos

The Ultra guard has an optional remote LED which flashes when it’s in operation, depending on where it is mounted, this can be seen from the ground. Personally I don’t use it on mine, yet, but am thinking of getting a couple for my 2 Ultra Guards. It really is a clever device as it detects the power being supplied to the Rx then sets itself at .5v less, when it detects a fail it cuts in immediately. It also charges itself from the main Rx pack when in flight.

I made the mistake of not fitting one to my GP Revolver which was completely destroyed as a result of a power switch / cable failure which cut the Rx power. This would have been saved if I had an Ultra Guard fitted.

Chris Bott - Moderator19/08/2018 13:56:15
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Thanks Mike, I'd found a short looking connector that looks something like those, but I hdn't seen the tall ones. Those are much more likely to be suitable.

Ron I do wonder if a small percentage of failures attributed to switch / cable failures might be a fault at the plug that plugs into the Rx?

So - here's another permutation. After knocking this 6ch one up I realise that for 3 of the receivers I plugged it into, it would have been better if I'd included 7 ports.

I think this style would be easier / neater to encase?

img_20180819_133951.jpg

img_20180819_134012.jpg

The Orange receiver ends up upside-down! DOH!

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Chris Bott - Moderator21/08/2018 22:33:49
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The latest incarnation. Using better quality sockets as discussed.

This is an 8 way. It could easily have one or two sockets removed to suit the Rx.

I'll probably cut the one end off and also make a straight through version. Then we're ready to look at cases.

I don't think I'll be going into production, they're pretty fiddly to put together and take time.

img_20180821_221644.jpg

img_20180821_221745.jpg

Gary Manuel21/08/2018 22:51:29
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What's the current rating of the PCB tracks Chris?

P.S. I think the straight through version is more practical than the right angle one, but it's good that you have both options.

P.P.S. When you get the gremlins sorted, I'm sure you could sell just the PCB's (and cases?) as most hobbyists (including me) would be interested in making them up from the components.

Chris Bott - Moderator21/08/2018 23:09:31
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To be honest Gary the tracks are just as fat as I could make them. There are tracks both sides of both boards so 4 in total per rail.
My thoughts on their rating is that if we have a model which has servos where that would be a worry, then we should be using something a bit more sophisticated anyway.

I guess some copper wire could always be soldered along them.

PM your address to me and I'll pop a board in the post.
Gary Manuel21/08/2018 23:22:29
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PM sent Chris.

Stephen Jones22/08/2018 00:04:12
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What a most excellent idea and design you have their Chris.

And i am sure you are right in regards to possible power drops to the Rx via the standard servo power connector.

As i my self have had problems in the past with green corrosion on the power connector.

thumbs up Steve.

Mike T22/08/2018 01:19:22
404 forum posts
28 photos
Posted by Chris Bott - Moderator on 21/08/2018 22:33:49:

I don't think I'll be going into production, they're pretty fiddly to put together and take time.

But if you (or someone) could put the boards, headers and plugs in a polybag with an A4 'how to' sheet, I'm sure there'd be lots of takers - assuming you could do it for, say under 10 quid?

Edited By Mike T on 22/08/2018 01:20:01

Chris Bott - Moderator22/08/2018 11:57:18
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Thanks Mike.
That's certainly something to think about.
Chris Bott - Moderator15/12/2018 21:36:55
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I still haven't flown with one of these, but that's only because I haven't been flying for months.

I am part way through putting together an ARTF that I think would benefit.
Having decided that two separate supplies would suit this model, I've developed the idea a little and added a dual 10A diode and an LED indicator for each supply.

I'll probably use a UBEC one side and a LiFe battery the other. I might cover all the exposed parts with hot gun glue or Sugru. The board can be screwed down in the model with the Rx mounted on velcro or ty-wrapped down. I've only just realised that I could even remove the Rx from the model and still leave all the servo wiring intact.

img_20181215_203343__01.jpg

Martin McIntosh15/12/2018 21:47:16
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Anyone want a Spektrum Powersafe 9ch Rx? I bought one some time ago but have not even powered it up. I have, however, pinched all the satellites.

Geoff Sleath15/12/2018 23:40:14
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Posted by supertigrefan on 19/08/2018 10:15:36:

I am not particularly electronics savvy and I get the issue that is being addressed here but isn't it a bit like the multi-socket cubes we used to use to plug a bunch of plugs into a single outlet or using a 13A device on a 3A circuit?

Used to? We still use them but I'm careful of the load so I don't plug 2 x 3kw (ie 13 amp) devices into the same one. They're just a convenience to save swapping low energy devices for each use. I'm just annoyed with myself for not building more sockets in when I wired the kitchen ring main - my excuse is that I had to work fast one evening after work because the kitchen fitters were plastering the following morning.

I've often thought the main sticking point in servo load wasn't so much the connector but the receiver PC track. Perhaps it's better to use a separate battery/ubec and only let the receiver itself carry the signal loads. I've only done that with retracts.

Geoff

Chris Bott - Moderator15/12/2018 23:47:54
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That's just what this is doing too, Geoff.
Power from the diodes goes direct to the servo sockets rather than via the Rx.
Geoff Sleath15/12/2018 23:55:21
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Sorry Chris, I hadn't appreciated that. I'd just prefer a circuit diagram rather than a description - I understand them I'm a bit slow these days - it's the weather.

Geoff

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