[Noisebridge-discuss] Help/Advice for a circuit board design.
Daniel at coloraura.com
Thu Jan 23 21:27:03 UTC 2014
Thanks for the reply.
The TD62783 is a Darlington array, I added it to this design so it
should be fine now. All the current for the LEDs will be handled fine
(and within specs) of the TD62783 and the 3 TLC5916 chips. I was
actually more interested in comments on the routing of the board, and
best way to source parts.
Is your place in West Oakland BART accessible? I live in Concord, but
usually take BART to work in SF.
On 1/23/14 11:42 AM, Hilaire Nollette wrote:
> Looks like you are trying to drive the whole matrix with one chip, in
> this arrangement you'll need Darlington arrays, that chip won't drive
> a matrix directly, I am willing to either face2face at Noisebridge, or
> you can come to me in West Oakland, I have an electronics lab here.
> the way you have it setup you are driving too many led's from one pin,
> 120MA maximum per chip. What you'll need is something like a 2N3096 on
> each leg of the chip driving the array. I can show you samples of all
> of this, as well as proper current limiting.
> Let me know,
> On Thu, Jan 23, 2014 at 11:05 AM, Daniel Pitts <Daniel at coloraura.com
> <mailto:Daniel at coloraura.com>> wrote:
> I have a design for a project, and I was hoping to get some
> face-to-face feedback on the design. I was thinking Noisebridge
> might be a good place to do that.
> It seems that Circuit Hacking Monday's would be a good time to do
> that, but I would like to see if someone with experience/expertise
> would be willing to meet up with me at that time specifically to
> look over it.
> Board (PDF):
> Schematic (PDF):
> Board (EAGLE):
> Schematic (EAGLE):
> The goal of the project is to build a programmable 8x8, 12bit
> color LED display, and to do it "cheaply", while still maintaining
> some level of quality. I had a prototype working, though it didn't
> support the full amount of current required. It worked when
> powered from a battery, but burned out a chip when I used a real
> power supply (the 74HCT238). I added a high-side driver to fix
> that issue.
> Anyway, if someone would be interested in talking with me about
> this, then I'll try to show up on a Monday night.
> Noisebridge-discuss mailing list
> Noisebridge-discuss at lists.noisebridge.net
> <mailto:Noisebridge-discuss at lists.noisebridge.net>
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