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HelicopterMain Discussion › Home made VR
01-02-2010 07:09 AM  7 years agoPost 1
tinyfeet68

rrNovice

anchorage,alaska

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Hello...Guys,
here's my home made voltage regulator
First pix...lipo battery,volt meter,and regulator
second pix...volt meter direct to the battery reading is 8.25V
third pix...volt meter negative to negative and positive to output reading is 4.94V
this regulator can handle 12V to 35V input voltage.
Thanks
happy new year!!!

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01-02-2010 09:51 AM  7 years agoPost 2
wws2010

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La Cresenta, California - United States

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Awesome man, watch it though any load on that and it will heat up! I wouldnt put that on a plane or heli.

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01-02-2010 10:10 AM  7 years agoPost 3
Evil_Homer

rrVeteran

Cubbington, Warwickshire, United Kingdom

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What type of regulator is it, switched or linear - I think it is linear from the picture you have shown, if it is linear - 12 volt input from 3S lipo at one amp draw for a few servos will result in it having to dissipate around 7 watts of heat.
Stick a 5 Ohm resistor across the output, least 5 watt rating and see what happens.

Lastly one amp is just a thumb suck, it will vary depending on servos used and load against the servos.

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01-02-2010 11:47 AM  7 years agoPost 4
nivlek

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Norfolk England

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Yes it looks like it's just a 7805 linear regulator . It would need a good heatsink to be able to supply an amp for more that a few seconds with a three cell lipo . Any more than a three cell lipo and it's not really practical .
You also really need to add an I/P and an O/P capacitor for stability .

At the end of the day , it gets dark .

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01-02-2010 01:35 PM  7 years agoPost 5
kangarooster

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Orlando Fl-USA

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01-02-2010 01:47 PM  7 years agoPost 6
Gyronut

rrProfessor

Martinsville In.

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Great job Feet.

Now all you need is a heatsink and some filtering caps and your good to go.

I like playing around with the 78L05's...

Rick

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01-02-2010 02:52 PM  7 years agoPost 7
Riq

rrKey Veteran

ND

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Nice work.

I use a similar homebrewed soln to power my ignition off a123s on my 50 and 100cc planks.

I agree, I wouldnt put much more voltage and power to it as it just wont take it.

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01-02-2010 03:33 PM  7 years agoPost 8
helipr0

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Molenstede/BELGIUM

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7805 can handle only 1A..

Team Gaui
Team Hacker TopFuel
Team KBDD
www.youtube.com/helipr0

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01-02-2010 04:49 PM  7 years agoPost 9
AirWolfRC

rrProfessor

42½ N, 83½ W

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Nice circuit . . . . I came up with that about 30 years ago . . . . used a 7812 with a couple of diodes in the ground leg to get 13.5V out and used it as a 10A bench supply.
. . . . I would use at least a 10 ohm for the EB resistor. Keeps the regulator's Pd down. Even more if the input voltage is much higher.

You can do the same thing without the NPN, a 7805 and one diode in the ground leg to get 5.6V. . . . one for each servo and your good.

The only down side is the high drop out voltage of the regulator.

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01-03-2010 08:07 PM  7 years agoPost 10
rumbleweed

rrNovice

Maryland=USA

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The absolute max current spec on the 78XX series regulators is 2.2A, at 70Degrees. This means running digital servos on a warm day you have a major crash waiting to happen due to total loss of power.

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