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Old Aug 06, 2007, 12:56 PM
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Chester, UK
Joined Nov 2005
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Where to get voltage regulator 5v

Iím looking to build/buy a voltage regulator (5v). Iím looking to power the video transmitter from a 3s li-po battery and was wondering if anyone can point me to a suitable UK based supplier.

I donít mind soldering or assembling components, but I just havenít figured out where to find one.

Any guidance/advice appreciated.

Dave
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Old Aug 06, 2007, 01:47 PM
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Hoofddorp, Netherlands
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You should be able to get the parts for that in most any hobby electronics shop. Alternatively mail oder from e.g. http://www.farnell.co.uk/, or www.conrad.com, or other suppliers that seem OK if you Google for '"electronic component" uk'.
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Old Aug 06, 2007, 02:43 PM
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If you're in the US you can get them at Radio Shack for less than 2 bucks. That's where I got mine. They have a diagram on the package to tell you where to solder the wires.
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Old Aug 06, 2007, 02:46 PM
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Chester, UK
Joined Nov 2005
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Thanks guys.
I've just been on to the Farnell web site. I had no idea it was that easy.
3 pins 2 x capacitors and you're done..... or am I missing something?
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Old Aug 06, 2007, 04:42 PM
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you are in the uk so you may have a maplins store near you www.maplins.co.uk
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Old Aug 06, 2007, 05:10 PM
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Hampshire, UK
Joined Apr 2004
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or you could try a UBEC such as the one on BRC Hobbies website. I use one to power my Canon A620 from my flightpack, it works a treat and you can get them for around 8 quid!!

Cheers
DaveB...>
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Old Aug 06, 2007, 05:26 PM
RC Airplane Crasher
Mesa, AZ
Joined Jan 2007
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I used a TI switching voltage regulator to powwer my camera, it's more efficient than the junky linear regulators you get at Radio Shack, plus it can handle 1 Amp continuous and not get hot at all.
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Old Aug 06, 2007, 09:56 PM
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Lexington, KY
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When powering a video transmitter, the switching regulators create a pattern of interference lines (called Moire' lines). Though less efficient and less tolerant of higher voltages, the cheap linear regulator adds no interference to the video signal. I use a buffered LM2905 on a heat sink for my planes that I care about the recorded video. On planes I'm just using the video downlink to frame shots, etc, I cheat with a switcher.

Dave
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Old Aug 07, 2007, 03:00 AM
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Quote:
Originally Posted by davef27
Thanks guys.
I've just been on to the Farnell web site. I had no idea it was that easy.
3 pins 2 x capacitors and you're done..... or am I missing something?


It's really that simple


David

PS. I run mine off a 2-cell 1350mAh Tornado LiPoly pack.
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Old Aug 07, 2007, 03:12 AM
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Quote:
Originally Posted by davef27
... power the video transmitter from a 3s li-po battery .... Dave

I've had problems with heat using a 7805 on 3s.

Dave
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Old Aug 07, 2007, 03:19 AM
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Yeah, go for a 2s pack. Otherwise you're dissipating (12-5)*(current draw) watts across something 10mm square! Say you're drawing 300mA, that's 2.1W .... good for warming your fingers when you handle it, but a waste of energy! With a 2s setup it would be nearer to 0.75W which is more reasonable.

I'm running a 10mW 2.4GHz transmitter AND my A620 off a 2s pack with a 7805 and it barely gets warm.

Cheers,


David
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Old Aug 07, 2007, 05:18 AM
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I use this little device from Perkins, not a bad price ether!

http://www.jperkinsdistribution.co.u...s%20and%20accs

Gray.
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Old Aug 07, 2007, 05:38 AM
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Hmmm What do you use that for Gray? With those specs I would assume it's a switching regulator, which a downlink might not like ...


David
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Old Aug 07, 2007, 06:35 AM
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David,

I use it to power the A620 in the EZ* and uses the main lipo pack for power input with the BEC powering the RX.

Iíve not had the opportunity to use it with a downlink though!

Gray
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Old Aug 07, 2007, 03:07 PM
RC Airplane Crasher
Mesa, AZ
Joined Jan 2007
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Dave, the moire lines you mentioned, do you think they would occur when just using the regulator to power a digital camera recording video?

That is what I'm doing, and I have not noticed moire lines, but do you think they could be there and I just haven't noticed them? Could they be lowering the quality without me knowing it? How easily can they be seen?

If I post one of my aerial videos could you tell me if you see any interference in it that could be caused by this?
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