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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Regulator question
02-06-2008 08:57 PM  10 years agoPost 21
Funky Trex

rrElite Veteran

Westerville, OH - USA

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We took a servo extension and stripped one side of it to connect to the volt meter. We plugged the other end into a spare RX channel to get the RX voltage and then we plugged it into the step down to get the voltage after the step down.

The voltage to the RX matched what my 611 readout was on my heli. The other guy was runnnig a 401 so we only had the voltage on the meter with his setup.

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02-07-2008 05:33 AM  10 years agoPost 22
Zaneman007

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Texas - USA

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I am running the duralite 6 volt reg system. When I first set it up I was running 6 volts to the gy611 amp. It read 6 volts. I had the step down between the servo and the amp. I have since moved the step down. I placed it between the Rx and the gy611 amp. The amp now reads 5.3 volts.

Old Guys Rule!

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02-07-2008 12:51 PM  10 years agoPost 23
BarracudaHockey

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Jacksonville FL

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I'm not convinced that reading is accurate without the servo hooked up Funky. Thats why I use an inline meter, the load is still connected to the other end.

Zane that surprises me, considering there is two connections from the reciever to the amp I wonder what the voltage will be at the servo, I'll have to check this out when I build my 600n and have everything spread out on the bench.

Andy
AMA 77227
http://www.jaxrc.com

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02-07-2008 03:05 PM  10 years agoPost 24
racingstripe

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Sacramento, CA

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^^ I thought the same thing...
But, if it has all three wires on both conectors as seen on the GY611, you will have to remove the red wire from the gain lead, or you will end up bypassing the stepdown.
andy-

Proofread carefully to see if you any words out.

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02-07-2008 05:47 PM  10 years agoPost 25
kcass518

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Port Washington, NY - USA

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OK, here's what I'm doing. I'm getting the Spektrum VR5203 Dual Output Regulator for the gyro/tail and the throttle servo which also can't handle more than 4.8v. I'll plug the GY401 and the throttle servo into the VR5203. If I get a better gyro which would need to plug both gyro leads into the VR5203, I'll change servos for my throttle at that time to handle the 6 volts. Then, I'm going to remove my stabilizer, fill my fuel tank, put the VR5203 in the front with the receiver, and then add weight to my current battery pack until I'm in balance. After that, I'll remove the added weight and battery pack, weigh them together, and find a 6v NiCd pack that weighs the same. That should do it. I don't think I need more flying time than that will provide. Here in the "Land of No", I get about an hour or so to fly before the planks show up. I can always field charge if I get lucky.

Thanks for all the responses. I learned a lot.

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02-07-2008 11:05 PM  10 years agoPost 26
AirWolfRC

rrProfessor

42½ N, 83½ W

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A good choice for a diode step down is a 3A rated 1N5400
It is a typical silicon doide. It's performance looks like this,

As you can see, 0.75 volt drop is a good number to use.

A step down is only good if you already have a regulated voltage to your RX looking like it comes from a 5 cell NiCd pack (6.5V to 7.0V). Then you can use TWO step downs and get down to 5.0V to 5.5V).

Using a 1A LDO regulator would be a better way to go for gyro & servo only.

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02-08-2008 01:50 AM  10 years agoPost 27
Zaneman007

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Texas - USA

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Barracuda,

I disconnected the red wire on the gain plug. If you leave both red wires connect, it will bypass the step-down and feed 6volts to the amp and the servo.

I found out the hard way as usual.

Old Guys Rule!

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02-08-2008 01:54 AM  10 years agoPost 28
Zaneman007

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Texas - USA

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Air,

If I read your chart correctly which I doubt, the step down voltage is based on the current draw? is that correct.

Old Guys Rule!

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02-08-2008 02:38 AM  10 years agoPost 29
AirWolfRC

rrProfessor

42½ N, 83½ W

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Yep.

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02-08-2008 03:24 PM  10 years agoPost 30
BarracudaHockey

rrMaster

Jacksonville FL

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e=i*r and all that

Andy
AMA 77227
http://www.jaxrc.com

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02-15-2008 02:03 AM  10 years agoPost 31
George Matthews

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N.W. Ohio

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I haven't seen an answer to one of the original questions in this thread.
With the Spektrum VR5203 and a Futaba GY611 gyro does the gain plug from the gyro need to be plugged into the VR5203 along with rudder plug?

The instructions for the VR5203 state "Spektrums dual output regulator installs between The receiver and the gyro in the rudder and gain channels and regulates the voltage to the gyro and tail rotor servo to a constant 5.2 volts. This allows the rest of the system to operate using higher voltage, typically 5-cell NiMH 6 volts or even 2-cell LiPO 7.4 volts."

So it looks like Spektrum is saying that you should connect both the rudder and gain plugs from the gyro into the regulator then go from the regulator to the RX.

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02-15-2008 12:48 PM  10 years agoPost 32
RCHelicopterGuy

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Michigan

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What does the acronym MPI stand for?
Maxx Products Inc.

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02-15-2008 03:10 PM  10 years agoPost 33
kcass518

rrVeteran

Port Washington, NY - USA

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Georg, Since no one has responded, I think the answer is, if you want to use the other input/output for something else, the GAIN plug in the 611 can stay in the receiver if you remove the RED wire from it. This means that IF you don't, the full current will bypass the regulator by going through the black and red wires on the GAIN plug. By removing the red wire, the current is forced through the regulated plug.

Hope this is correct and that it helps.

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02-15-2008 03:19 PM  10 years agoPost 34
George Matthews

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N.W. Ohio

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Thanks for the reply.
That is pretty much what I figured. So if you where running a 401 then you would just run the gain plug into the rx as there is just a single wire on the gain plug of a 401.
Thanks again

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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Regulator question
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