[Diy_efi] Triac versus Relay - Knowledge please!

[jim]

On Sun, 4 May 2003 11:23:13 -0500, "Daniel R. Nicoson" <A6intruder at adelphia.net>, you wrote:


[snip]

>1) Can these relay coils induce a voltage spike harmful to my EEC anytime
>during their operation?   Starting up?  Turning off?
At turnoff a relay coil will induce a voltage spike. relays can be had with a protection diode built
in.
>
>2) The relays are not shielded by metal boxes (both mounted in plastic
>boxes), can EMI be a factor from CB radio's, ignition or anything else?
Relays are not very sensitive to EMI or RFI. Triacs are much more sensitive to false triggering.
>
>3) Would a triac be an appropriate replacement to the electromechanical
>relay's?
NO, because once the triac or scr is turned on, the only way to turn it off is to remove power from
it. On power line application, this happens 120 times per second. For a battery powered application,
once you turned on the triac it would stay on until the battery was disconnected! (or ignition
switch was turned off)
>
jim

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