Here's the charger. It's basic but it should work more than fine with protected batteries.

Found some by searching for "cold shoe" instead of "hot shoe":

How about this:

We cannot mill magnesium in our CNC as it is highly flammable. So its not just the cost of the material but having production outsourced entirely. Combine that with low volume manufacturing and you will find prices to be totally astronomically I am afraid... :)

There is still airflow if the fan is on, it circulates internally. Magasinating, or loading, whatever thermal capacity there is there.
If the dissapation air-alu-air is good enough, then maybe.

Did you think it possible to add a "weatherproof membrane" at the top of the fan.

Did you think it possible to add a "weatherproof membrane" at the top of the fan. The idea is to protect a minimum from rain, dust or snow (or coffee) but in the same time keep the camera can breathable.

The problem is that the Zynq overheats before anything else in the camera even gets warm if there is no airflow or circulation.

Well not if you use it as a still camera for just a quick image. (?)
Or if you are outside in sufficiently cold weather.
But yes, even if "always" having to remove the lens, is it still not a better solution?

I see, not convinced though I must admit...
The fan needs to be running and have free airflow at all times.

OK, so i shouldnt have used a lenscap to illustrate, and rather a camera cap. That being said, the fan is also the wrong way, but we are seeing the camera from above.

Would it be possible to add a lenscap as a cover for the fan?

Would it be possible to add a lenscap as a cover for the fan?

I research the ATmega8HVA and is seem to be "self programming" meaning that a test bench is needed to charaterize each type of cell and program the IC.

In T736#12255, @christophvarga wrote:

is it possible to shrink the with by 5mm?

Maybe. We could put the batteries sideways, but still need a litle space for the protection pcb and connector. We could do 95mm width 80mm height with this arrangement.

If you refer to the atx connector in the mockup, is just a reference, there are much lower profile connectors avalible.

ah, ok ;)

In T736#12254, @sebastian wrote:

One question though is if voltage measurement alone is enough to evaluate battery capacity/health.
I know laptop batteries for example monitor all currents going in and out over the entire battery lifetime and account for any aging phenomenons of the cells.

Laptop batteries don't actually do that, they have something that is almost planned obsolecence. For example, Dell uses a microcontroller that counts cycles anr/or usage hours, but not for each charger, they count the entire life of the cells as a whole (all of them in the pack). When a certain prefix limit is reach, the micro tells the computer, and the computer refuses to charger the battery.
So is a "safe life" protection. The battery may be fine, but because they want to avoid a lawsuit if something happens they just block the battery after a a few cycles/hours.

i agree an all the electronic decisions (simple as possible battery - modules) you suggested, they sound good to me.

+1 from me for moving the entire logic, DC/DC conversion and measurement electronics into a separate module and the cells with minimal protection-only circuit to another separate module.

Well, you can make a led status without a PIC or any microcontroller. we could desing a status around a vumeter IC, like the LM3915., with the press of a button it will tell you the state of charge.
The advantage of an analog state will be 0 current drain. Because you only read the battery when you press the button.

@Menga i like your design approach. does the hight and width (-the space for the hdmi/sdi connectors) match exactly to the backside of the beta enclosure? what about separating the cells in two groups and have one or two screws in the middle instead of having them on the sides. in that case we could also allow the package to be mounted under the camera and still be abel to mount it on a tripod. does 21700 cells also fit inside?

Does it need a 'PIC' to have status LED's directly on the battery?

Does it need a 'PIC' to have status LED's directly on the battery? that is something which is really useful (checking batteries when they are somewhere in the pocket..)
What are the extra costs going for the more complex battery design? We can have different battery capacities so that you won't need to own more than two batteries.

I Sacrifice my very own japanese sony charger from 1997. Is still working properly so i think is a design to look for.

Good progress towards an open source battery pack!

I corrected the schematic of the Battery Protection, i should be like this. Also aldd a 3 pin connector to allow the use of a charger/balancer

But they also do open hardware, it's another branch.

Unlikely that 'open source' would be dropped as it constitutes the entire basis of the project and its ethos.

I also like "cinema" is special. In the future, a marketing campaign can be linked to other products.

We may have found the solution there.

There is the option of just using 'open source' of course:

In T817#12239, @RexOr wrote:

Welcome Alex.

Welcome Alex.

open source systems, but, as Cinema refers to cinema. Source refers to software. Other alternatives...

Any more feedback on this issue please?

Something like this looks better to me.

I prefer the orange color of the text of Beta. My reason is so that you can disnquish it easier.

Sander Kessels - http://www.lollibomb.com/ / https://twitter.com/lollibomb?lang=en

I prefer Open Source Design and Open Source Cinema out of the seven names.

What would be better:
A- A CHarger with the balancer incorpored and a battery with only low voltage protection
B- A more simple charger and batteries with their own low voltage protection and balancer.

why not 3.75mm, seems like a descent compromise. And I don,t think it is going to impact any external gear added to the camera.

just for fun.. could apertus order one of these? http://www.paperbatteryco.com/products/powerresponder/

just for fun.. could apertus order one of these? http://www.paperbatteryco.com/products/powerresponder/

I will start designing a "case/holder" of sorts. Sorry I am getting back to you all so late, I have been busy with school.

Forwarded by @smnstrm1 on Twitter:

Yes, it won't be very hard to design our own battery pack for the Axiom.
Here i made a Low Voltage protection. It will cut at 6V, (3V per cell) and it can be added to each Sony NP-F in case it's necesary.

We could also build our own NP-F compatible batteries (later) with Panasonic 18650 inside. The electronics seem not too complicated.

Sony's NP-F batteries do have their own protection inside the battery. I disassemble one to check. This one in particular has two 18650 from panasonic, and it was built in 1997. This batteries are still being produced 20 years later and used in modern cameras like the FS700. So i think is a good route to build the battery system.
The camera could have a universal power conector to change between different battery plates, so other baterries could be adapted as well. Like RED does with their cameras.
Even an ATX power supply connector could do the job.

wow looks like difficult to found one with screw !

Those looks quite OK, but they are huge!

Maybe this one but we need to have some place inside the enclosure for the screws ! It's also easy to remove them and also maybe possible to adapt for a 3d print solution...

Soz. I came in from the channel.

maybe my original requirements were not 100% clear:
not huge
not ugly
not glue-on
:)

That's what I was searching for. Assumed it would be best for everyone. There was some screw on versions but they were more like nipples eg https://www.banggood.com/4pcs-Furniture-Table-Chair-Foot-Non-Slip-Soft-Rubber-Pad-Cover-Clear-p-970553.html

Those are all glue-on.

The round flatter ones would probably be the most sturdy. Maybe include another 4 loose in the box.

CLEAR POLYURETHANE STICK ON

It seems to be pretty standard to use PU foam as air filter.

opted for a rather simple design that can be lasercut from a sheet of steel or aluminum.

Material suggestion: aluminium profile in combination with plastic 3d printed inner parts

Personally really keen on the Greek symbols as you know, but when it comes to potentially lining the pockets of law people and those who stand to gain financially from legal procedures, that's when I'd get really turned off.

Another interesting read - Apple also won a trademark dispute against 'Pear Technologies':
https://www.theregister.co.uk/2017/04/27/apple_lawyers/

Sony has used the 'β' symbol on their equipment and it was registered with the USPTO:
http://tmsearch.uspto.gov/bin/showfield?f=doc&state=4805:uv244z.5.5
"Video Tape Recorders, Video Cameras, Projection Televisions and Video Accessories"

CAD finished, manufacturing is next

@TWiGGZ as you see there is no urgent need for this product but if you are interested feel free to experiment and design some 3d-printable dummys, the only thing which seems clear is that we go for the NP-F battery system. (i am on holiday from now on and will respond later this month)

As i said in the audio recorder issue, we should focus right now on finalizing the AXIOM Beta, then we can build more open hardware devices like this.

Than lets go the np-f way (for now) !

... It would be good to pursue this, but not in the immediate term if it starts adding weeks/months onto a potential shipping timeframe.

Keep in mind that lithium-ion cells need electronics around it to manage charging/discharging, etc. and cannot be just inserted like AA Alkaline batteries. Developing our own battery pack has several obstacles and disadvantages, the electronics development itself wouldn't be that big of a deal I guess but just think of the safety regulations and certifications we would have to deal with for no real advantage over existing solutions....

@davidak: good idea, or the 21700 cells which will gain popularity when gigafactory starts to produce. 1 Wh costs about 0,4$ = great! battery solution not only for cameras- universal open source powerbank arround the smallest possible pice from the industry -> the cell

Addition to proposal 2:

The atomos power station looks rather interesting actually: Dual 5 VDC USB power outputs should be perfect for the beta.

you are right.

More flexibility is of course always preferred but I had the impression we are building a camera integrated battery mount here. Such solutions to externally attach batteries to rods in several places in the rig and for several battery mount types already exist from several manufacturers no?

NO! that is a mistake, if you are using rods, than you put them ON the rods behind the camera.. usually..
and if there are no rods it is good to attach it to the body of the camera directly to make one sturdy body.
don't you think so?

good point.. maybe two (upright) next to each other on the back side ?
on the other hand this 'brick' will fit everywhere on a rig..

My concern for putting the batteries under the camera body are that it might get in the way of attaching rods at the correct distances below the lens center: https://wiki.apertus.org/index.php/Rods

hi, what about such a hot swap- double battery design which fits under the camera or somewhere on the rig?
for 4A it is also good to have two batteries so that (the cheap ones) don't get hot too much.

Ok