TOH meets JAQ, for makers and strategists, for fun and profit? [fuel cell power supply TOH]

Hi Mano, where do you see the additional benefit in having a special TOH, which would make the phone really bulky? Would not just connecting the JAQ to the Jolla recharge the phone and serve the intended purpose?

Hi Joerg, for urban users, the JAQ is best to be used as it is – hope you have it arround if your'e short on energy ;-) But for (longer) journeys or longer visits to locations where solar-chargers and non-rechargeable batteries are the only power source, a built-in JAQ could safe luggage space and hassle and also reduces the checklist because you just have to check your pocket for credit card sized powerplants ;-) The technology should allow producing quiet slim JAQ-THOs, making the phone not really bulky; probably increase thickness from ~9mm to something about 15mm? But I'm no mechanical engineer nor do I know JAQ's housing components.

I'd just consider a JAQ-TOH as an unique selling advantage – at least Jolla could easily be the first offering such an accessory, because the JP design allows rapid extension development like that :-)

-Mano

Hi Mano, well I'm (an engineer I mean :-) and I'm currently playing around with a few ideas for Jolla TOHs (see http://www.drechsler-it.de).

Designing the mechanical part should not be to difficult. The real challenge will be the electronics. Already NiMH batteries are not as simple as they seem. I'm sure a fuel cell has it's own perks. Without the specs (at least for the cells) that's going to be a tough one.

If there is enough potential for sales, one might be able to convince myFC (the company behind the JAQ) to sign an OEM deal, so you get all the information you need to build a TOH. But myFC is a NASDAQ listed company. So I'm afraid we are talking serious money here, before they are even answering your calls :-)

On the other end: For oneself, one could use a true maker approach. The JAQ is pretty much exactly as long as the Jolla phone, but a little wider. So we could glue a JAQ to a TOH (or use hook and loop fastener). Depending on the esthetic demands we could even hide the cable somewhat. But of course, this would not be a commercial solution.

Hi Joerg, very nice tinkering site! I got my JP arround the same time, but haven't done much tinkering yet, besides a quiet well working Qi-charging-TOH. I'm still fighting with SIP, X509 and usability in general to get my JP ready to replace my E7. I love this puppy, but it needs polishing at so many (software) edges, that it'll never be consumer compatible (MHO). So the only option to survive is to offer unique features (again, just my opinion). Recently someone posted a link to a blood-pressure TOH (don't remember the medical details, it seemed to claim serious medical usage), which was the best idea I've seen so far. I hope more of these will follow, keeping JP alive :-) And when I read about the JAG, I thought that could be one of the JP supporter; due to lack of own ideas basically ;-) I do have plans/idea to deploy JP as a remote diagnostic support-tool for MFAs (roaming nurses ;-)) utilizing some well-proven OpenSource component's I'm quite familiar with and successfully offering for some years :-) But haven't even started talking about it to the customer.md, who's a happy early-adopter (and CS-master in his life before md) [very tiny scope here, not comparable to medaso, first have to take a look at TM2]. ""

Best,

-Mano

Hi Mano, I have been thinking about integrating Qi charging into my TinkerTOH as the next step, using this http://www.digikey.de/product-detail/de/P9025AC-R-EVK/800-2977-ND/5409044&WT.z_slp_buy=idt_design-kits. I wonder so, if there is an even smaller solution. What did you use?

Hi Joerg, I modified that: http://www.ebay.com/itm/291475884229

I made two different versions to compare heat dissipation problems. Both _are_ problematic. This receiver delivers true 900mA+ when coupled with that: http://www.ebay.com/itm/301682273184 at the cost of at least 2.5W power dissipation.

The qi-controller is soldered on a heat-spreader, which perfectly does its job and heats the battery ;-)

I have a bunch of photos well documenting the mechanical steps for the center-coil version.

There's almost no difference in temperature adding compared to the offset-coil version, where the qi-converter-IC find's it's place in the sd-card cavity, but the center coil version works nicely in any orientation and angle, while the offset-version needs the lower coil from the transmitter, which doesn't work well with steep blade angle. Both add about 10°C bat-temp, compared to 1050mA charging from USB (reaching more than 45°C bat-temp where some protection circuit kicks in and reduces current from about 900mA to 200-400mA until temp drops below 40°C; but haven't investigated which temperature threshold triggered the protection circuit – I guess it was controller-temp or system-temp, not actually the bat-temp, because I saw more than 46°C bat-temp while continuously charging at 850-950mA).

Best solution: Stick two small spacers at the upper edges. This gives a small vent between TOH and the transmitter-plate. Afterwards battery temp maxed out at around 43°C during a full charging cycle (only center-coil-version tested). I don't have tiny enough sticky-bumpers to check if adding these also to the bottom would further reduce additional heating, but I'm confident it does without current-drawbacks.

I can send you the pictures by email if interested,

Best,

-mano

Hi Mano, that would be splendid. Could you send them to qiTOH@medaso.de? Kind regards,