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RE: RDAS Classic Voltage Requirement
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john fedel
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Oct 22, 2009 19:15 PDT
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Thanks,
I'll have to look and see if I can tell what regulator is on the board.
My first thought was to use a regulator like you suggested. But being in
a hurry, I just stuck in a few diodes.
I'll probably go back to the regulator idea.
John
From: Bill Schworer [mailto:schw-@cox.net]
Sent: Thursday, October 22, 2009 1:51 PM
To: rd-@topica.com
Cc: jerry-@gmail.com
Subject: RE: RDAS Classic Voltage Requirement
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.
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