[DML] Re: RPM Relay - A Modern Alternative
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[DML] Re: RPM Relay - A Modern Alternative



I agree with all your saying.  And as more cars use my new unit and 
hours get racked up running it there may turn out to be a design 
change needed.  The biggest problem with the old relay design is they 
use a single sided circuit board and the heating and cooling of the 
unit is breaking the solder joints on the relay to board.  My new 
board is double sided epoxy glass, 2.5 oz copper with plated through 
holes.  This alone would fix 90% of the old unit failures but why 
stop there?  The MOSFET drivers guarantee the resistance of 0.003 
ohms turned on will always be that value.  A new relay has similar 
resistance of the contacts but quickly increases with use (switching 
inductive loads is hard on relay contacts).

Time will tell.  Won't it be nice not to have to carry a spare RPM 
relay?


--- In dmcnews@xxxxxxxxxxxxxxx, "David Teitelbaum" <jtrealty@...> 
wrote:
>
> It's not just the transistors, it's the wiring, the design of the
> circuit, the workmanship, etc. I bring this up because we all know 
how
> how notoriously unreliable the shift computer is. 
[moderator snip]

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