AVR-Chat

Whoops, guess I was thinking of three-layer boards.
:-)

On most of my AVR projects I try to keep most of the traces on one side and
mostly a ground plane on the other. I can't do plated-through holes.

Microcontrollers haven't gotten fast enough yet where you need to use
microwave substrates like Duroid or Takonics.

Zack


On Thu, May 26, 2011 at 11:51 PM, Dave McLaughlin <
dave_mclaughlin@nerdshack.com> wrote:

>
>
> Hi Zack,
>
> Just a quick one. 2 layer boards are the same as double sided.! :o)
>
> I am working on a design that is 6 layer just now. My first beyond 4 and
> have to learn high speed design. It is Cortex A8 based.
>
> I found a really interesting article from Bluechip Technology on this very
> subject but it is related to use with Altium Designer (which luckily I
> have)
>
> It is interesting to see how much more thought has to go into PCB design
> once you start dealing with high frequency and strict timing on processor
> bus lines etc. Have only ever worked with microcontrollers such as AVR and
> PIC etc, this is quite a challenge but one I am enjoying the learning
> exercise as a hobby. As I progress and get it all working I can take this
> over to my workplace.
>
>
>
> Dave...
> ---
> Very funny Scotty, now beam down my clothes!!!
> ---
>
> From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
> Of Zack Widup
> Sent: 27 May 2011 11:37
>
> To: AVR-Chat@yahoogroups.com
> Subject: Re: [AVR-Chat] Cheap 2 layer prototype PCB boards - custom made
>
>
>
> I have never made two-layer boards but I have made many double-sided
> boards myself. I'm not set up to mass-produce boards but I can usually
> make 3 or 4 at a time with no problem.
>
> I made some boards for 47 and 78 GHz (millimeter-wave) ham radio
> projects. The tiny circuits are etched on 5-mil thick Duroid
> teflon-fiberglass board. I used some HSCH9251 "flip-chip" diodes.
> These have packages about 10 mils square, and with leads the devices
> are about 28 mils long. The leads are a few mils wide. They look like
> fly specks. You can't solder them; there are two common ways of
> mounting them - wirebonding and with conductive silver-epoxy such as
> Epotek H20e. I use the silver epoxy.
>
> Zack
>
> [Non-text portions of this message have been removed]
>
>  
>


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