Agreed. But I deliberately left out the various "RC Switch" options
because:
(a) there are a lot of different technologies used (drivers, FETs,
relays, etc) that require some electronics background to understand the
subtle differences
(b) most of the ones that provide functionality equivalent to a MAG
Speed Control (servo with two switches wired as a mechanical H-bridge)
are much more expensive then a servo and two switches
(c) servo and switches are really, really simple, making them really
easy to install and trouble-shoot in the field.
I'm a big believer that everyone should start with the truly simple
solution, before looking for the "better" solution. That way, they'll
have a working benchmark to judge alternatives against. And, after they
gain lots of experience (aka. failures) with the "better" solutions,
they'll know just how sweet the simple solution really was.
Bear in mind, "simple" doesn't mean "inferior" either. I have servos
that are over 20 years old that have gone to hell and back (sunk too
many times in warships, jolted hard in tanks with no suspensions, etc)
and they are still working just fine. 20A micro-switches are made for
literally millions of cycles and cost $1 or less from surplus stores.
There's certainly enough room in any tank so that volume isn't an issue.
It takes only a few minutes to swap out switches and/or servos if
something does go wrong.
That said, I have multiple prototype boards that implement MAG Speed
Controls using relays and FETs to replace servo/switch solutions.
Definitely more expensive, slightly better reliability and slightly more
compact. The production versions will become my "go to" RC part for
elevate, rotate and trigger control, but it's taken many iterations over
the years to zero in on an approach that can service all the different
ways that those systems can be operated.
On 5/22/2013 3:19 PM, Mike Mangus wrote:
Another for firing an electronic trigger marker is an electronic on/off
switch. The Turnigy switch from Hobby King costs less than $7. Course,
there is shipping too ... heh.
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