Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "Tony Smith" <ajsmith@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Monday, February 02, 2004 5:11 PM
Subject: [Homebrew_PCBs] Re: Sunny making his first PCB


> 90 degrees bends are bad as the trace will act as a mini antenna. You
might
> think you won't have a problem since you not doing radio or high frequency
> stuff, but you will.
>
> The trace will both radiate & receive RF. It may sound odd, but low-speed
> switch can contain high-speed noise, leading to glitches.
>
> 10, 20, 40 MHz speeds are becoming common in hobby apps.
>
> You won't get bitten often, but you will get 'odd' problems, such as 'my
> board fails when I breathe on it!' (capacitance problem) and 'fails
outside
> my house' (local transmitter interference).
>
> Whatever happened to the groovy curved traces from years back (old
> calculators, etc). Well, apart from no hand layout!

I can do curved tracks with the PCB software I use (Pulsonix).

Leon
--
Leon Heller, G1HSM
Email: aqzf13@...
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html