1422Re: [AirWire] Re: Sierra operations with Airwire (was: I'm the new guy)
- Aug 15, 2013
> The only problem I have is the engine continuously notches after aAh, diesel installation... You need an opto-isolator circuit between
> certain point. It's like the sound board isn't sinking with the
> motor drive and thinks the engine is constantly accelerating.
the motor voltage output of the decoder and the motor voltage input
of the Sierra. You can get away without this with a steam
installation if you're not using any of the "automatic" sound
features or don't mind Fireman Fred not shoveling coal. But for a
diesel installation where the sound has to work in concert with the
speed, yeah, you need this so the Sierra can properly read the motor
voltage and adjust the motor revs properly. Otherwise, the Sierra
thinks the motor's always going full tilt, or--if you leave them
unconnected--thinks the motor isn't getting any voltage and goes into
shut-down after a minute. (This is a "flaw" in the Sierra design
overall; you need this interface regardless of which control system
You can get opto-isolators specifically designed for the Sierra from
two sources: Tony Walsham (RCS of Australia) and Aristo-Craft. I
prefer Tony's because it's about 1/4 the size of the Aristo version.
Tony's part #SSI-12v5. I don't see Aristo's listed on their site, but
if memory serves, it was around $30.
Now, having said all that, by the time you add the $17 function
decoder and the interface board (Tony's is around $50 US), you
haven't saved all that much money compared to the Phoenix, except for
the fact that you already own the Sierra. (It's been a l-o-n-g time
since I bought an opto-isolator; I thought they were a bit cheaper.)
So you may consider getting the Phoenix and selling the Sierra
anyway. I see them go for anywhere between $75 - $125. Or save the
Sierra for an installation where you just want generic diesel noise
that doesn't have to respond to a throttle, or whatever.
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