>>second button (ir type) arms alarm and sets deadlocks so why pray tell
>>aint you using it (cos its worth it for the deadlocks at least)
[quoted text clipped - 6 lines]
> ps. My car doesn't have an alarm and you're right I should be using
> the deadlocks but have never bothered.. :-)
btw pug reckoned it was static causing probs with the cmos chip inside
is this true then?
razzleuk - 07 Aug 2004 08:13 GMT
> btw pug reckoned it was static causing probs with the cmos chip inside
> is this true then?
It would certainly appear one of the ICs has failed. Connecting the
fob up to a power supply showed that it was pulling 4mA with no button
pressed! However the failure does not prevent the fob from operating -
as you know they work fine whilst the battery lasts. This is why
actually switching in the battery with the button press is an
effective solution..
G.T - 07 Aug 2004 12:00 GMT
Hi Jeff,
> btw pug reckoned it was static causing probs with the cmos chip inside
Oh, the old CMOS thyristor-lock side effect. I thought it was just old
stuff, and that we got rid of this annoyance with more recent chips.
Usual solution is to use two diodes : 1 between input & VDD, the other
between input & VSS. For this use (low power) I'd recommend signal diodes
like 1n4148 (possibly available as SMD).
Regards,
G.T
g.t6@worldonline.fr
205 Diesel & turbo-Diesel : http://205d.fr.st