[sdiy] 45 vs. 90 degree pcb traces

sleepy_dog at gmx.de sleepy_dog at gmx.de
Fri Feb 14 21:15:28 CET 2020


You be careful boy, them electrons will fall off the track when
trav'lin' round too sharp corners!

> Smooth angles are good for leaving your fast transients intact. Fat
> traces give phat sounds. :)
>
> But seriously, that has indeed been debunked long time ago. As the
> Altium article correctly states there is a point for manufacturability
> of sharp corners, and their tendency to cause acid traps during
> etching. I haven’t seen any problems with that in the last decade with
> 6/6 mil spacing boards though. I guess it might still be a problem if
> you’re designing/manufacturing iPhone pcb’s.
>
> Also, 45 degree corner is a misnomer in this context but everybody
> seems to call it that way historically. It should be called a 135
> degree corner.
>
> Ben
>
>
>> On 14 Feb 2020, at 19:46, Jimmy Moore <jamoore84 at gmail.com
>> <mailto:jamoore84 at gmail.com>> wrote:
>>
>> This came up on the AH "behringer RD-6" thread:
>>
>> >>Until the PCB traces are curvy (like on a 2600 or SEM) it's never
>> going to sound authentic.   Electrons don't like corners.
>>
>> I had picked up similar folk knowledge from my first engineering job
>> working alongside techs, EE's, and designers.  I went looking for a
>> more technical explanation on why this is the case, and it turns out
>> it is NOT:
>>
>> https://resources.altium.com/pcb-design-blog/pcb-routing-angle-myths-45-degree-angle-versus-90-degree-angle
>>
>> (Notable exceptions being RF, high speed, or high voltage layouts)
>>
>> This and another
>> <https://electronics.stackexchange.com/questions/226582/pcb-90-degree-angles> resource
>> debunk the pcb corner myth on EMI effects.
>>
>> Is there any other tangible (audible) impact this decision could have
>> for music electronics?  I think not, but I'd love to hear from other
>> more experienced engineers on this (hopefully not tiresome) topic.
>>
>>
>>
>>
>>
>>
>>
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>
>
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