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Old Oct 03, 2011, 08:08 PM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
Discussion
My crazy Micro Heli FPV idea. I need some advice!

I am using the FPVhobby.com 200mW 5.8GHz transmitter that draws 330mA @ 3.3V...

and a MC-495A camera that draws 75mA @ 3.3V to 6.0V.

Total theoretical draw is 405mA. This is a micro heli FPV setup (which may never fly from the added weight). Every gram counts here and i predict a 10 minute (at the very very most) flight time off the 180mAH main battery. I would like to match my video setup to the main battery's limited flight time, in order to keep the weight as low as possible.

1. Any recommendations on camera and Tx batteries and where to get them at the lowest price? Since I assume these batteries will be sub 100mAH, what sort of charger should I be using?

2. How can I effectively drop the 4.2V from a fully charged 1S battery to 3.3V to power the Tx and camera? Will LD1117 LDO do the trick? Or should i be using a diode?

Thanks for the help guys! Ordering everything right now!
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Last edited by caall99; Oct 05, 2011 at 05:47 PM.
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Old Oct 03, 2011, 09:39 PM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
Any tips while i am buying stuff?
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Old Oct 04, 2011, 04:49 PM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
bump? lol

It appears that the LD1117 requires an input voltage of at least 4.75v to output a regulated 3.3v. We all know a 1S battery won't achieve 4.75 volts, so it looks like i cannot use this chip. Are there other voltage regulators that can regulate to a 3.3v output and accept a 2.7v to 4.2v input?

Thanks.
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Old Oct 05, 2011, 04:51 PM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
Yipee! Talking to myself. Perhaps this LDO meets my requirements?
http://search.digikey.com/scripts/Dk...0-33WLDIDKR-ND

Can someone confirm?

Also, i still need to find myself a battery for the VTx.
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Old Oct 06, 2011, 03:28 PM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
What do you do if no one responds to your thread?? Just sit there? lol...
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Old Oct 07, 2011, 11:40 AM
characters welcome!
Mark Wood's Avatar
United States, CA, Bear Valley Springs
Joined Feb 2000
26,181 Posts
This should be asked in the FPV forum where the experts reside. You'll likely get the info there that you are looking for.

mw
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Old Oct 07, 2011, 12:00 PM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
Is there anyway this topic can be moved please?
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Old Oct 07, 2011, 12:28 PM
Southern Pride
everydayflyer's Avatar
Haralson County GA. USA
Joined Oct 2004
34,545 Posts
Click on the Report This Post to a Moderator
and then request it be moved to..................
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Old Oct 08, 2011, 02:32 AM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
Thanks for moving this... Maybe i will have more luck here!
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Old Oct 08, 2011, 02:51 AM
Registered User
Netherlands
Joined Sep 2007
414 Posts
I have done it with a micro heli, but your transmitter is to heavy and has to much output power. You better grab a set of these http://www.fpvhobby.com/143-sub-nano-combo-set.html and use a seperate lipo for it.
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Old Oct 08, 2011, 09:14 AM
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FPVistanbul's Avatar
Istanbul / Turkey
Joined Oct 2007
185 Posts
Hi caall99.

Why do you want a regulator device from 4.2V to 3.3V? Our 5.8gHz 200mw Tx module works with 3.3V - 4.2V directly. No need a step-down regulator for it.

Best regards.
Adnan.
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Old Oct 08, 2011, 10:36 AM
Crashomatic
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United States, CA, SF
Joined May 2010
2,043 Posts
https://www.insecure.ws/2010/02/25/u...heli-blade-msr
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Old Oct 08, 2011, 11:28 AM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
Quote:
Originally Posted by FPVistanbul View Post
Hi caall99.

Why do you want a regulator device from 4.2V to 3.3V? Our 5.8gHz 200mw Tx module works with 3.3V - 4.2V directly. No need a step-down regulator for it.

Best regards.
Adnan.
Because I found the unit for 15 dollars new (shipped), vs. your cost of $39. So i am looking to make the modification myself.
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Old Oct 08, 2011, 11:41 AM
Crashomatic
CrashMeUp's Avatar
United States, CA, SF
Joined May 2010
2,043 Posts
also 1s 50mah zippy at hk for flights shorter than 5 min are fine. else 160mah hk nanos

the 5.8ghz rx is 2x cheaper at hk too.
the camera has a decent price at fpvhobby but it probably is much cheaper if you find a larger supplier.
i usually get all from fpvhobby cause its convenient execpt the rx, at hk
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