|
RE: RDAS Classic Voltage Requirement
|
Bill Schworer
|
Oct 22, 2009 13:51 PDT
|
John -
I have both the classic and compact units, and was faced with a similar
issue on using the compact with the onboard ATV system and OSD. IIRC (its
been several years now so my memory is sketchy), I looked at the specs and
the compact definitely seemed more "sensitive" to a higher voltage input.
Also, IIRC if you look at the compact you will see a voltage regulator on
the board - I don't recall what the voltage out is. I did put both versions
of the RDAS on a variable DC supply once and slowly reduced the voltage
while they were in the launch detect mode, looking to see when they quit
working, it was around 7 volts or so, I did not check the firing capacitor.
What I do is drive the compact/OSD/ATV system using a higher voltage pack
and regulate the RDAS input down to 9 volts as a precaution since a blown
regulator on the compact costs a lot more than a separate cheap 9 volt
regulator. Radio Shack has 9 volt regulators for a buck or so, a couple of
filter caps is about the same price. You can get a simple circuit diagram
for the value of the caps off the web by doing a search on the regulator
part number. The compact draws so little current that no heat sink is
required for the regulator. The regulator and caps are "potted" inside
epoxy so there is no issue with vibration or shock.
Not sure if that answers you question, but that is how I resolved the input
voltage issue on the compact so I could use LiPoly RC packs.
Regards,
Bill Schworer
_____
From: John Fedel [mailto:jo-@fedel.org]
Sent: Thursday, October 22, 2009 12:19 PM
To: rd-@topica.com; rd-@topica.com
Subject: RDAS Classic Voltage Requirement
I have an RDAS Compact and want to use some Li-Po battery packs. I've been
using an 11.1 volt pack and putting in some series diodes to drop the
voltage within the recomended 9 - 10.6 volt range.
I'd love to use just a 7.4 volt, or 11.1 volt battery pack directly. The
RDAS Classic has a ratting of 9 - 15 volts. What is the limit of the
Compact. Is it just the firing capacitor? That could easily be replaced.
|
|
 |
|
