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600 Class Nitro Helicopters 600 Class Nitro Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 06-30-2009, 09:46 PM   #61 (permalink)
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Rogie got it now basically flow 2 ways on one lead, the positive wire +. No doubt Futaba will make this obsolete soon. There will be no need.
Thanks for your post.
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Old 07-27-2009, 08:02 PM   #62 (permalink)
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well im using my 9252's cyclic in the align 2 in 1 at 5.8, they work great. i got a 5.1 align for the tail servo, and i couldnt get me another one for the governor servo. i dont want to push that much my throttle servo at 5.8.

so i went to my electronic suply store, and i bought 1 A diode, so i went home for give it a try, and my voltage only dropped .3 v

so i went to the store again and bought another one, so i did solder the two of the in serial to get a drope of .6v, and it worked perfectly..

now my throttle servo sees 5.2 v...

you think its gonna be ok for the throttle servo with the align gov 5.2 ?

i know that 9252 at 6v and connected to a governor would be a dead servo for sure...

5.2 would be just fine ? or should i go to the store AGAIN haha and buy another diode to get me 4.9 v ?
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Old 07-28-2009, 08:28 PM   #63 (permalink)
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Keep in mind that the voltage drop across a diode varies with the current. A diode
is not a regulator.

The .7V drop of the diode you have will only be true at a specific current for that
particular diode.

Before you fly with 3 diodes in series, I'd test it. Put a 6 volt light bulb across it or
better yet, use a charger/discharger to put a load on your setup. You might be
surprised at the result.
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Old 09-25-2009, 06:19 AM   #64 (permalink)
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You may have purchased a Germanium diode. They have a voltage drop of 0.3 volts.


The voltage drop of a diode DOES NOT vary with current.
The beauty of the diode is a consistent voltage drop over its operating current range .

Last edited by N017RW; 09-25-2009 at 07:40 AM..
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Old 09-25-2009, 08:00 AM   #65 (permalink)
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The drawing is correct and illustrates insertion between the gyro and servo (secnario 1).

Now what happens when you plug the step-down (a.k.a. SD) in between the BEC and RX to lower the voltage to everything? (Scenario 2)

With just one diode the SD would only work in one implementation.

In scenario 1, the gyro (current source) is plugged into the SD's female or socket side and the servo (load) is plugged into the SD's male or "surrounded pins". Now one of the two diodes is forward biased and the diode will pass current and drop ~0.7 vdc.

In scenario 2 it is the opposite hook-up in terms of current flow. The SD's male or "surrounded pins" is plugged into to BEC (current source) and the Rx (load) is plugged into the SD's female or socket side.

Now the other diode is forward biased and the user is none the wiser.

Regardless of how you name or assign sex to the connectors ( I guessed) the result is the same.

This is illustrated here:
http://www.align.com.tw/shop/product...oducts_id=2276
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Old 09-25-2009, 02:15 PM   #66 (permalink)
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Quote:
Originally Posted by N017RW View Post
The voltage drop of a diode DOES NOT vary with current.
The beauty of the diode is a consistent voltage drop over its operating current range .
This link says that it does and you can calculate the drop using a formula.

http://www.nlreg.com/diode.htm
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Old 09-25-2009, 03:25 PM   #67 (permalink)
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I agree there is some variation in the voltage drop. The graph you presented is not new.

But in the context of the discussion and the diode's intended application here, the drop is very consistent.

Your graph does not define the type of diode and can be misleading in that it does not show the drop(s) at currents more in line with how the diode will be used, say in the 1-3 amp range. Here you'll find the rectifier diode's voltage drop much more consistent (though admittedly not exact).

Last edited by N017RW; 09-25-2009 at 06:38 PM.. Reason: punctuation
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Old 10-14-2009, 08:25 PM   #68 (permalink)
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i am building one of these tomorrow. so I get the 1n4001 diode from rat shack and put two of them on the positive line right, one going one way, one going the other way and I'm done right? And I can run the BEC at 6Volts on my trex500 and the dropdown will keep my tail servo okay?
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Old 10-15-2009, 05:06 PM   #69 (permalink)
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If you are putting 2 diodes in series, they both go the same direction. Plus line to anode of diode 1, cathode of diode 1 to anode of diode 2, cathode of diode 2 to plus of servo.
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Old 12-03-2009, 11:10 PM   #70 (permalink)
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Hi guys. I recently picked up an S9257 for my trex 450 (401b gyro). I plugged it in and it was buzzing. I looked up the problem and discovered that I needed a step down, found this very helpful thread. I have the parts to make one (many IN4001 diodes, servo extension, soldering pen), so I started to make one like on page 6. Surprisingly, that only dropped the voltage from 6V to about 5.8V. Then I tried a single IN4001 (Same way, putting diode(s) on the positive wire between gyro and servo, white ring facing servo) and it dropped the voltage from 6V to about 5.6V. Weird, eh? I know it should drop the voltage a bit more then that. Of course, I tried it with 3 total, all white rings facing the servo. That got the voltage to 4.9V, good.

1. I have read all of this thread and I think there were mixed opinions about the placement of the diodes. Like don't use more then one / problems will occur if it's not set up like the picture on page 6. Is what I did going to be ok?

2. The servo still has a buzz no movement, just a buzz. Is this normal, even at the correct voltage? It goes away when the servo reaches its endpoints. Servo horn is on but there is no linkage on it, so it's not a binding issue. I shouldn't send it back to Futaba, should I? Did I screw it up when I plugged it in at 6V before or something?

Thanks for the help! I'm on RCU a lot but Helifreak rocks!
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Old 12-04-2009, 04:20 PM   #71 (permalink)
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Quote:
Originally Posted by N017RW View Post
The voltage drop of a diode DOES NOT vary with current.
The beauty of the diode is a consistent voltage drop over its operating current range .
Quote:
Originally Posted by StallWarning View Post
This link says that it does and you can calculate the drop using a formula.

http://www.nlreg.com/diode.htm
Actually the link says that the drop is constant. The formula and graph explains the relationship between voltage over and current through the diode. This function is non-linear because of the nature of the silicon semiconductor material (it is not compareable with a normal load as a resistor).
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Old 12-04-2009, 08:17 PM   #72 (permalink)
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Quote:
Originally Posted by koolaid man View Post

2. The servo still has a buzz no movement, just a buzz. Is this normal, even at the correct voltage? It goes away when the servo reaches its endpoints. Servo horn is on but there is no linkage on it, so it's not a binding issue. I shouldn't send it back to Futaba, should I? Did I screw it up when I plugged it in at 6V before or something?

Thanks for the help! I'm on RCU a lot but Helifreak rocks!
My 9257 does the exact same thing as yours although it seems to work OK in flight.
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Old 12-07-2009, 01:54 AM   #73 (permalink)
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Amazing to see that my thread is still alive after almost 3 years and it's still an issue for some.... Maybe this should be a sticky....

Digital servos buzz... some more then others like the Align servos, or Savox. Buzzing is fine, though it will drive you mad when setting up a heli.
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Old 01-17-2010, 12:36 PM   #74 (permalink)
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Default Which diode should I use?

I need something like this but to step down from 11.1 to 6v. Just need to lower the voltage for a fan going on an esc. Which diode should I use?
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Old 02-16-2010, 07:03 PM   #75 (permalink)
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Any know if you can make one to step down to 2.0 volts? Thanks
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Old 02-16-2010, 07:06 PM   #76 (permalink)
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Schottky Diodes..... it's spelled wrong, but should be close enough for a google search.
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Old 02-16-2010, 07:38 PM   #77 (permalink)
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HFG, Thanks you got the spelling right , but i am not sure what ratting i need here what i am doing battery out put 8.24 v need to reg it down to 6v the one i have only give me .7 v drop so my qustion is how do you read them?
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Old 02-16-2010, 07:55 PM   #78 (permalink)
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If a 1N4001 gives ya .7 what do i need for a 2,0 drop or is that possible
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Old 02-16-2010, 07:57 PM   #79 (permalink)
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well 3 will give you roughly 2.1V drop, but remember the diodes will be dissipating the power, so if you are doing more than 1 servo it very likely you will need a heatsink.
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Old 02-16-2010, 08:09 PM   #80 (permalink)
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Running from the receiver to the gyro, that it running rest on 8v
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