General rule is: keep the wires as short as possible.
They do not only add stray capacitance, they also act as antennas for radiating the crystal frequency and its harmonics
(in most cases [for digital electronics] the crystals are not operated with a pure sinusoidal waveform, but with a more square shaped waveform, this causes a lot of harmonics, dependent on the rise time of the slopes).
This may cause interferences in the radio or tv next to you (and your Newt) as well as to other electronic parts inside the Newt.
Johannes
-----Original Message-----
From: Robert Benschop [SMTP:rbenschop_at_mac.com]
Sent: Monday, January 21, 2002 2:31 PM
To: NewtonTalk
Subject: Re: [NTLK] MP2100 homebrew overclock
on 21-01-2002 1:35, Johannes Wolf at jwolf_at_xe.estec.esa.nl wrote:
> but beeing an electrical engineer I have to admit that I do not really like
> the very simple solution of switching two crystals and doing this via
> relatively long wires.
> Ok, a frequency of 3 or 5 MHz is still considered to be low, but the wires
> should be shorter.
How short ?
If I look at Stephanie's site I can easily picture the two crystals further
up, which would almost half the amount of wire.
And yes, I would like David to come out with a switching solution, but that
doesn't look very promising at the moment :-(
Robert Benschop
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