Making a pen for a digitiser tablet - calcomp DB3

Oct 09, 2005 2 Replies
A

I had some success making a pointer device for a trust digitiser last year. I didn't actually need one for that device, I was using it for investigation.



The tablet I need a pointer for, because they're very expensive to buy, is a Calcomp DB3. When I came to investigate this board, I couldn't find the HF signal to feed the pointer as in the trust device.



Of course it's possible the calcomp doesn't work, I got it in an auction with some other kit 10 years ago!



Anyone have any experience with these?



Cheers, Alex



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S

I think the puck is just a receiver maybe with an amplifier in it, and the board itself generates the field. How does the trust pointer work?

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A

Nope, the trust and calcomp work, like all these devices, by a grid of wires (pcb lines these days) which pick up a magnetic field from a small coil in the pointer device. They locate it by the wires picking up the most signal. I don't think it could really work the other way around.

Cheers, Alex

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