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debugging relay matrix — Parallax Forums

debugging relay matrix

bddbbd.bbddbbd.b Posts: 12
edited 2007-04-21 21:35 in BASIC Stamp
I have some strange behavior on one of the relays in a ghost telephone keypad relay matrix: the relay in question is wired up to be switched by a 2n7000 FET. When I set the FET pin high, I get 2.12 volts or so, and it does not switch the relay. The output pin is fine. I am using the standard 10k ohm to ground on the pin and and a green LED in parallel (The LED drains a trivial amount of voltage). The FET/relay seems to be fine, since it switches as expected when tied directly to +5v. I was hoping someone might be able to tell me what to look for here.
Thanks.
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