This one is really complicated to explain through email. Yes, the wires
will act as antennas. An RF shield (Faraday cage) around the entire circuit
will help. Good power and ground planes, especially ground plane will help.
Make sure any unused space on the board's surface is ground. Make your traces
as short as possible. Do *NOT* use sharp turns for your traces...make them
45 degree turns at least or preferably round turns. I would suggest putting
aluminum foil on the inside of the cartridge case, all the way around, to make
a good shield.
That's about it. Good luck!
-Chris
On Tue, 28 Jan 2003 mickey_m@xxxxxxxxx wrote:
> For anyone who has built their own flashable cart, or anyone who knows. I
> built a flash cart on a shack proto board with a whole lot of soldered wires a
> microcontroller, a cpld, and flash. I have made some changes to the design
> that introduced a 20 Mhz clock into the CPLD. The design works fine, the
> problem is I get interference on the TV screen. Moving the VCS or the proto
> board increase or decreases the problem, also grounded tin foil helps, which
> makes me think RF produced from clock. I want to print a PCB. My question
> is, is the interference from all the wires acting like antennas? Will it go
> away when I place the design on a PCB? Maybe try to print a ground plane
> under the CPLD or microcontroller? Any tips for reducing this in circuit? I
> have grounded all possible points on the chips, including unused pins on the
> CPLD that are programmed for ground.
>
> Thanks for your help.
>
> Vern
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