[sdiy] Ground planes

[cheater cheater]

On Wed, Mar 31, 2010 at 23:21, Magnus Danielson
<magnus at rubidium.dyndns.org> wrote:
> Ingo Debus wrote:
>>
>> Am 31.03.2010 um 01:55 schrieb Magnus Danielson:
>>
>>>  it just isn't used in the audio-realm since the need for ground-planes
>>> is almost none.
>>
>> But aren't HF properties important even in very low frequency circuits
>> when it comes to EMC?
>
> Well... most of them can be handled fairly well locally where needed. We
> rarely use fast parts, so doing the 100 nF ceramic cap between the power
> pins on digital and comparators and keeping those leads short should get
> most of it. It's not like you want to support a few hundred MHz or so on a
> regular basis. It's when the more fun processor stuff occurs that some more
> attention is needed.
>
> So, for most part doing it for HF-reasons seems a bit of an over-kill. Doing
> it to save etching seems much more reasonable to me at least. If someone can
> show me a case where it has or should have impact,

Your synth is standing next to your computer, TV, network switch, fan,
or some other source of HF EMI.

D.

> then I would maybe look
> at it. I just don't want people to waste time on something which has little
> gain for them. Knowing why it may be needed is another thing.
>>
>> I agree desoldering from ground planes is a pain even with thermals
>> (sometimes called thermal traps). Patience is the key.
>
> Pre-heating is the real key. If you pre-heat it properly, then the actual
> soldering becomes much easier.
>
> Cheers,
> Magnus
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