Re: Solid State Relay's for Trim/Tilt System.
No doubt......Well, tweeking compression ratios, pistons, bores, milling, porting, jetting and the like for higher performance is more a visual, touch and feel thing that tends to go over a bit easier but, sometimes what you can't see, touch, feel or understand per se, it's taboo to even think "tweek" for some. Sure people "chip" blindly for performance but, when someone mentions the actual components involved or the algorithms used, or wants more throughput or higher res A/D's.....people cough, spit and run!! Status quo sometimes prevails here, especially in retro'ing in these "black magic" area's at component levels. Wrenches are just easier to use than data sheets, calculus and o-scopes gm. Simple cold hard fact
Thing is.....Merc, Johnny and ALL of industry in general have been in using MOS transistors in their capacitor discharge ignitions, coil switching circuity, voltage regulars and the like for many many trouble free years, waaaaaaaay more predictable and huge life span as compared to the old mechanical ig's and voltage reg's!! But, most people aren't even aware of that specific technology? And why would they need to be? They can't/don't need to see it, they can't feel it or even open it up to adjust it or even file it. It works well and never breaks, they go with it.
Speaking of "filing on", It wasn't too long ago back in the days of old that the scary but mighty transistor was installed in the first electronic ignitions to replace those arcing, sparking, burning points we so loved to file on. You know as well as I, 99.9% of people said "nahhhhhhhh, never will work, not reliable "
It hasn't been until resenly(last few years) though these FET's have reached this incredibly low Ron level that it is now. I predict soon though OB manufactures(I think
Yamaha is already, i could be a little late ot flat wrong, I don't have access to all their design info) will soon be using these new gen MOSFET's in the trim/tilt area more and more, it just makes sense. Aerospace is....those Boeings and McDoug's we jump in and whisp off in everyday are, in this
exact area! They out preform mechanical systems hands down just like they are in electronic ignitions currently.
And here we are again......We have a new gen of transistors that are just as reliable, power supply in pace maker reliable, fly people around the world reliable BUT, just like anything else, they have limitations, understanding and designing within the limiting parameters is critical, knowing what makes them fail is critical and if there is ways to prevent/limit and manage these typical failures is imperative.
The body of this little transistor is roughly the diameter of your index finger nail and yes!! The data sheet is right, those are amps @ 100C!!! The pulsed current is 1530 amps!! The metal leads will first melt away due to heat from current flow before the silicon switch inside fails. $4.65/ea. They can be paralleled which then doubles,triples etc the current as they would share current in the given path and/or for redundancy. I'm using two for each relay mounted on the existing plate for a heat sink........as i said, works on paper and I might just be crazy thinking but, I don't think so and I think it's time to get ride of those old POS relays I have to keep buying.
