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Why not use relays in place of a fet job?
Posted: Tue Feb 22, 2005 6:35 pm
by viperdout
Well, I've seen 5 volt relays used on xmods, and even though they get rid of the propo function, what would it matter on a Bit/ZZ, except for the SE? It's supposedly more efficent, so I don't see why not, and it'd be really easy to solder on. Anyone have a reason to say nay so long as the realy trips at a low enough voltage for a ZZ/Bit? To me, it seems like the perfect solution to replacing the fets on the board.
Posted: Wed Feb 23, 2005 5:45 am
by betty.k
have you seen the size of a relay?
Posted: Wed Feb 23, 2005 9:48 am
by Matic
That would be waste of time.... Fets have VERY little inner impedance, which can be ignored, plus you can`t make dual speed with relays.
Posted: Wed Feb 23, 2005 11:30 am
by viperdout
Betty, I've seen some pretty small relays, and I think if there's a relay that turns on at a low enough voltage, it could be fit in. Hall, I found a low-voltage indicator for my MT that's small enough to fit in the Camaro body's rear window! At least answer me this: would it work in theory?
Posted: Wed Feb 23, 2005 4:33 pm
by betty.k
of course it would work, but it's old technology. a fet is far superior to a relay in this application.
Posted: Wed Feb 23, 2005 4:43 pm
by viperdout
betty.k wrote:of course it would work, but it's old technology. a fet is far superior to a relay in this application.
That's what I wanted to know. Thanks for the info.
Posted: Thu Feb 24, 2005 6:28 am
by ph2t
the thing is viper is that the coil in the relay would prolly suck more current than the motor it's powering, especially in a 1/64 application...
ph2t.
Posted: Thu Feb 24, 2005 9:02 am
by viperdout
ph2t wrote:the thing is viper is that the coil in the relay would prolly suck more current than the motor it's powering, especially in a 1/64 application...
ph2t.
Yes, but isn't that coil powered by the motor, while the motor is drawing from the battery? I thought that the electromagnet in the relay closed when the PCB applied voltage, then the current flowing through was drawn from the battery itself, but I'm not nearly as good as you electronics guys. I figured it's worth a shot.