I have a custom solution as well (very simple using commercial chips -
more adjustable and configurable)... I can send details if requested.
Cheers.
Simon
Simon Judge
Electronic Engineer MEng
(Clinical Scientist)
[log in to unmask]
020 8770 8283
http://www.meru.org.uk/interfacecentre/
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> -----Original Message-----
> From: Colin Clayton [mailto:[log in to unmask]]
> Sent: 02 April 2003 10:20
> To: [log in to unmask]
> Subject: Re: Touch switch
>
>
> The Wolfson touch switch requires no pressure - works on a capacitance
> effect - I designed it 17 years ago! You can use any metal plate, my
> experience is that it can be a different sensitivity on some surfaces.
> Colin Clayton
>
> At 09:42 02/04/2003 +0100, you wrote:
> >Dear all
> >
> >Can anyone recomend a good touch switch (zero pressure)?
> >
> >I've not used one for many years and previously found that
> either they
> >needed a fair amount of pressure (eg membrane switches like
> Pal pads) or
> >they were difficult to adjust so that they worked on touch,
> but not proximity.
> >
> >The QED catalog has Taction pads and a Wolfson touch switch.
> Has anyone
> >used these?
> >
> >Barry Taylor, Clinical Scientist
> >Bioengineering Department
> >Tulley Medical Physics Building, Hull Royal Infirmary
> >Anlaby Road, Hull HU3 2JZ
> >Tel 01482 675928, fax 01482 675750
>
>
>
> Colin Clayton BSc, CEng, MIEE, MIPEM
> Great Ormond Street Hospital for Children
> The Wolfson Centre
> Mecklenburgh Square
> London WC1N 2AP
> Tel: 020 7837 7618
> Fax: 020 7833 9469
> visit www.wisedx.com
> email: [log in to unmask]
>
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