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  #21  
Old 11-30-2013
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Re: FrankenBebi

New news at the FrankenBebi Project

Prototype PCBs arrived Friday afternoon, and the first try at population and assembly into the case was successful, A few issues, but it would seem the basic design premise is sound.

Schematic and PCB rendering for the next iteration (ver: 0.11.03) have been posted. New version includes a blocking diode to prevent damage from reversed power leads, and some additional significant design changes.

Coming soon... A documents repository will be added to the webpages, containing all relevant files, including the Eagle .sch and .brd files, .pdf copies of schematic and board layouts as well as licensing information. The project is being released as Open Source Hardware, under the CERN OHL v.1.2 Open Source Hardware License.

Thanks for your interest and support.

More info on the latest updates may be found at the project webpages
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  #22  
Old 11-30-2013
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Re: FrankenBebi

Cap, as an alternative to a blocking diode, what about installing a crowbar diode across the power leads? If power is hooked up in reverse, it goes through the crowbar and that appears to be a dead short, blowing the fuse in the power line to the light. Rashly assuming a proper fuse has been installed, of course. But it gets the voltage drop from a blocking diode out of the circuit. Or opens the whole can of worms on "protections".

I'd still suggest adding a chip (there must be cheap ones out there, because they are being used in really cheap flashlights) that would allow the light to strobe and SOS. Seen in LED flashlights shipping from China to the US for $5 each, including ground post shipping, so the chip can't cost more than what, one cheap LED does?
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  #23  
Old 11-30-2013
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Re: FrankenBebi

Quote:
as an alternative to a blocking diode, what about installing a crowbar diode across the power leads? .... Rashly assuming a proper fuse has been installed
Fuse? You mean we need a fuse?

Crowbar would eliminate the voltage drop but too large a fuse (over the rated current of the crowbar diode) could cause the crowbar to fail open, cooking the innards anyway. Everything is a compromise, and from the performance of our prototypes at low battery voltages (less than 11Vdc) it was decided that the .5V drop across the Schotky diode we have decided to try will have a negligible impact on performance.

We would have preferred to eliminate reverse voltage protection all together (a can of worms indeed) but as it only takes a millisecond mistake to let the magic smoke out, we might be replacing a lot of units under warranty that were ok other than installation error.

As far as a strobe/sos generator, it should be fairly trivial to design if one does not already exist as an IC. Problem would be where to put it (see comments on board density above) and how to trigger it. It might however, make another kind of neat project as a stand alone device wired into the supply side circuit? If properly sized, it could be used on existing anchor/tri-light circuits or any other resistive load.

Hmmm.. add that one to the list of future Franken-Projects for the community to kick around.
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  #24  
Old 12-10-2013
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New FrankenBebi Project News

New news at the FrankenBebi Project

Cheops' Law: Nothing ever gets built on schedule or within budget
We have had some changes in our release dates. For the full story, follow the above link.

Documentation: Now available online
Documentation pages are now online at the website. This area contains zip archives of each posted version of the FrankenBebi up to and including the latest untested v0.11.03. Each file includes the native Eagle Lite sch and brd files, standard image files of the schematics and board traces and layouts, and additional files concerning licensing and appropriate use.

Download and enjoy.

As always, if you have questions or comments, please contact us via this thread, a PM, or via the Email address listed on the website.
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Last edited by Cap-Couillon; 12-10-2013 at 12:30 PM.
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  #25  
Old 12-27-2013
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Re: FrankenBebi new news....

New news at The FrankenBebi Project..

First up, we now have our own domain, FrankenBebiProject.org and new email addresses to match. Shiny new toys for the holidays. If you have our older pages bookmarked, you will be forwarded to the corresponding page on the new site. All the old email addresses are still usable, but as always, it is best to update your bookmarks.

Along with the new domain, we have made a few changes to the web pages, mostly just housekeeping issues. We have however added a quick-mail form to our contact page so you can contact us directly without having to copy and paste our email address.

We have also added a short (5 question) survey to the home and news pages on the site. If you have the time, please stop by and fill it out so we have a better idea of what the community at large wants from the FrankenBebi anchor light. No personal information requested, just the facts ma'am.

Meanwhile, testing of existing designs continues along with some new experiments by our latest team members.

Igor will have the full newsletter for late December mailed out sometime this weekend. See the website for how to subscribe if you want "the rest of the story"....

Thanks again for your interest and support.
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Old 01-12-2014
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New FrankenBebi Project News

New News at the FrankenBebi Project.

Quick recap....
New project team members
New circuit design with better performance and reliablilty.
New monolithic case design (Thanks "HelloSailor")
Effects of new designs on release dates.

For all the latest news visit the FrankenBebi Project website
While you are there, you can subscribe to Igor's Newsletter to get the latest delivered to your inbox in a semi-regular fashion.

If you haven't done so yet, please take a minute to fill out our short (6 question) survey in order to help us tailor the FrankenBebi to the cruising community's needs.

As always, thanks for your interest and support.
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Old 01-30-2014
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New Case Preview

Here is a preview of the new "Ice-Cube" case design



Igor's latest Newsletter will be sent out this weekend....
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  #28  
Old 02-07-2014
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Re: FrankenBebi new news....

New News at The FrankenBebi Project

Latest schematics and board designs posted. Future options and more... Please take the time to fill out our survey if you haven't done so already.

As always, your comments and suggestions are encouraged, either via this thread, or via the project site.

Fair Winds.
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Old 02-10-2014
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FrankenBebi Circuit Description

We have posted an in-depth description of the latest FrankenBebi circuit design, including theory of operation, component selection, and some test results. It can be viewed online or downloaded as a PDF File (150KB)

Regards,
The FrankenBebi Project
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Old 02-10-2014
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Re: FrankenBebi

Cap, I have no certain memory just a big fuzzy thought that large series-parallel arrays of LEDs with only the one resistor feeding them were frowned upon in this type of design? Wrong fuzzy memory, or is there something to that? No drawback?
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