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    Re: LTTO HEAD SENSORS

    Posted by Builty Email on October 27, 2005, 6:08 am, in reply to "Re: LTTO HEAD SENSORS"
    138.217.70.122

    AND gates work with digital logic only; the might be suitable for parallel connecting decoded sensor module outputs, but not for connecting photodiodes as they are an analog device.

    Quotes from TagFerret a while ago (not my words):

    "..but the diodes we use in production are the LiteOn LTR-516AB model. Digi-Key carries the LTR-516AD model, which is almost identical but has a slightly different IR pass-band (it is 20% less sensitive to the 940nm IR used in LTTO, but is ideally suited to the 880nm used in WoW/ESS), anyway it should be a drop-in replacement: Digi-Key part number 160-1032-ND"

    And:
    "Actually, additional photodiodes often DECREASE the sensitivity in direct sunlight -- basically they draw too much current and the front end power supply cannot provide enough current to keep them all properly biased, so they begin losing sensitivity. At night or indoors or in the shade it is not an issue, but in bright direct sunlight it can be a real pain.

    Adding photodiodes is probably a very good approach, though, as this is essentially what the external sensors do (they add a bit more, but not too much more). It might be possible to simply put a pair of LTR-516AB photodiodes from LiteOn (these are what we use in the receiver dome, they are available from DigiKey) under the "chin" or along the bottom edge of the round hinge-like feature just ahead of the trigger guard.
    This would give you a target to hit if the Tagger was being pointed up with the receiver dome on the far side of you.
    The extra load on the front end should be enough to eliminate the self-oscillation which causes WoW self-hits. Since these two diodes would
    normally be shaded I don't think they will add enough of a load to have any significant bad effect on the sensitivity. It just might work.
    Make sure the photodiodes are connected up with the anodes to ground (they are reverse-biased in this circuit).
    They should be hooked up just in parallel to the ones in the Dome. I would use a shielded cable like RG-174/U co-ax or a high quality headphone cable with a full shield, not just a twisted pair. Make sure the wiring stays well clear of the speaker."

    Link: http://www.fragtag.com.au


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