Alt-BEAM Archive
Message #08365
To: beam@sgiblab.sgi.com
From: Robert Stein rastein@dakotacom.net
Date: Sat, 18 Dec 1999 08:08:23 -0700
Subject: [alt-beam] Re: PCB iron on transfers
At 11:18 PM 12/17/99 -0800, you wrote:
>jester96@iname.com wrote:
> >
> > ... The only way I can make PCBs now is with a pen, and that it's a
> pain in the arse, so I am looking for something better. How much do cheap
> UV boxes cost?
>
>Chris, you might want to consider photo-etching. A number of firms now
>make PCB's pre-coated with a photo-resist.
>
>Design your layout, print it onto transparency overlays, place it on a
>piece of pre-coated PCB material, weight it with a transparent plate,
>and expose it to UV according to instructions. Then develop the plate
>and etch.
(snip)
It may be a slight inconvenience, but use the sun. Won't get any
better source of parallel light. Besides what you may have heard it is
easy to get GREAT quality at home with the kits. If you follow the advise
of those who know how to do it. If you use quality copper boards and
quality silvering components, you will get very reliable boards at a very
reduced price. Not everyone wants to make 60 boards at once, then you are
going to pay out the nose for the boards. Even so, if it is a small
board....use a bigger copper board and cut-n-paste to fill the board. Like
what was mentioned before in an earlier message, follow the instructions
and you will succeed. Board houses can do it better, but their primary
function it to produce lots of them and fast. Hope this helps.
Robert
8366 Sat, 18 Dec 1999 10:14:07 -0500 (EST) [alt-beam] stuff beam@sgiblab.sgi.com jester96beam@iname.com Ian, could you e-mail me that image of your bipedal walker again? I recieved it but it was an "unidentified format" (iname sometimes does that to incoming files for some reason). Thanks.
How would you go about adding a head to a 2 motor (bicore) walker PROPERLY to make it turn towards light? I don't want the head to turn on the walker (unless it's easier if it does).
How would you go about making a 4 motor (bicore) walker turn towards light? How does a four motor walker walk, anyway? I have seen two different variations of 4 motor walkers. some like Ian's (and Mark T's) Stryder robots, and then solarbotics 4 motor walker.
Dave is there any good images of that one yet? I have just seen the ones on Ians page (I think) which don't really show how the motors are laid out.
Thanks.
Chris
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8367 Sat, 18 Dec 1999 12:22:13 -0500 [alt-beam] Re: Step-up converter beam@sgiblab.sgi.com Bob Shannon ACtually, you want to use 2 or more of the .5 volt cells, and a the .7 volt
circuit, for best efficiency the added voltage helps.
Also, dont forget to add about 220 uf across your solar cells!
Silicon cells totally outclass the SunCerams!
Ian wrote:
> Hi BEAMers, I just got my hands on a small batch or really nice solar cells
> (try 6x more efficient than the SunCeram cells). The only problem is that
> they are only on average .54v @ 324mA so I'm going to need some kind of
> step-up DC-DC converter. I found some Maxim ones that will run off of .7v
> but I'd like to be able to use a single cell. Does anyone know of a chip or
> circuit that will convert .5v to 3.3v-5v??? Thanks for your help.
>
> Laterz
>
> --------
> There is only one true "SyNeT"
> BEAM Online - http://www.beam-online.com
>
> I didn't fight my way to the top of the food chain to be a vegetarian.
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