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By mrw81
#191958
Hello and greetings:

I need some help with a very small project. Trying to create a small flashlight and need someone to draw the schematic and board. I can't imagine it will take more than two hours for someone proficient as there are only 4 components. Anyone up for the task? I should have mentioned: am willing to pay a reasonable price in exchange for the service

MW
By theropod
#191969
I can do this. I have Adobe Illustrator and can export a file into many formats. If your circuit is as simple as you say you could draw it out by hand. Are you looking to screen print the resist and etch boards on a production scale? If so there are open source vector programs that would work for you at no cost. At any rate I could do this, and would not charge a penny.
By mrw81
#191978
Hey theropod, thanks! I had to add a battery charging controller so it will end up with 7 components, but yes it is simple. I'm pricing components now and plan to have a prototype made locally. I found an fab shop near by that can produce and assemble. They have their own design rules and I'm not sure if that complicates things or not. https://macrofab.com/help/creating-mana ... cts-eagle/. I'll sketch it up and send to you this week.

MW
By lyndon
#191993
I've never heard of a PCB vendor that takes Autocad format, but anything's possible. Autocad can probably export to RS274 Gerber, but the drill file will be a problem. You'll probably have to generate that by hand.
By mrw81
#192006
theropod, I think I have got my hand drawn schematic done. Although I may have made an error somewhere as I haven't done this in nearly 20 years. Let me know if you have any questions. I have the datasheets available but can attach all due to size limitations. Here links to those which would not fit:

USB Recptical: http://portal.fciconnect.com/Comergent/ ... 118192.pdf
Capacitor: http://www.mouser.com/ds/2/400/lcc_comm ... 837201.pdf
Battery: http://media.digikey.com/pdf/Data%20She ... ML2430.PDF
LED: http://www.mouser.com/ds/2/602/DS208-736705.pdf
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By n1ist
#192011
A few issues:
- The LEDs are backwards
- You need more than 3V to drive them. At least 3.3V plus whatever you are dropping across the resistor.
- You CAN NOT dump voltage across a lithium battery; for most, you need a proper charging circuit, but the data sheet for this one shows charging it with a current-limiting resistor.

/mike
By theropod
#192012
I'll give this a more thorough examination tomorrow, or over the weekend. A new Aims 4,000 watt pure sine wave inverter/charger is to be delivered tomorrow for our off grid power system, and will require some time to install and set up.

Looks simple on first glance. The screen printing artwork doesn't care about LED orientation, nor do the holes matter. Can you provide a width and length constraint on the board so any drawing will be to scale?
By mrw81
#192029
n1st: also, I realized the cells are good for 10mA output max. I'll have to locate a cell capable of better delivery.

theropod, i need to fit this onto a board of approximately 1.5 x 2.5". I'm looking at replacing the battery with a CR123a cell with through hole tabs or SMD tabs, probably the latter. Then of course the charging IC and periphery...
By theropod
#192064
Ok, I think I have all the info I need to produce a first draft for your review. Our household has experienced a small crisis that has delayed me addressing several matters, but I have not forgotten. Someone dumped 3 puppies on our private road and we couldn't let them suffer a prolonged death by starvation or predation by the hoard of coyotes that surround us. So, please allow me some extra time to generate your image files. Thanks.