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HelicopterMain Discussion › HV Servos with regular throttle...
06-21-2017 11:52 AM  3 months agoPost 1
wifeorheli

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reno, nevada usa

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Just wanna refresh my memory I can run HV cyclic and tail then a step down for my throttle on my nitro correct? Thanks guys....

Novarossi Motors U.S.A
www.PlanetHobby.com
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06-21-2017 01:05 PM  3 months agoPost 2
Flyin for Jesus

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Dana Point, Ca. 92629

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Yep

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06-23-2017 12:05 PM  88 days agoPost 3
wifeorheli

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reno, nevada usa

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Thanx FRJ

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GrandRc.com

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06-23-2017 12:13 PM  88 days agoPost 4
wifeorheli

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reno, nevada usa

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This is all i can find. This right?

https://www.getfpv.com/5v-step-down...CFUtNfgodte8OkQ

Novarossi Motors U.S.A
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Team Align
GrandRc.com

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06-23-2017 12:44 PM  88 days agoPost 5
JuanRodriguez

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The Villages, Florida

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Why not use a HV servo for the throttle and eliminate the need for the step down ?

Been there, done that and old enough to know better.....

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06-23-2017 12:46 PM  88 days agoPost 6
Heli_Splatter

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USA

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Align sells a 5v step down regulator.

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06-23-2017 01:03 PM  88 days agoPost 7
pH7

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Sterling Heights, MI - USA

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The Align stepdown isn't a regulator. It steps down the voltage 0.7 volt. So, if you give it 42 volts input, it will output 41.3 volts. The link supplied by wifeorheli is truly a regulator. If you give it 42 volts, it will output 5 volts. I realize none of us are using an input of 42 volts, I just used that number to exaggerate the difference and because it is within the operating range of the shown regulator.

A more practical example: with 7.4V input, the Align stepdown will give you 6.7V out while the regulator will give you 5V.

Phil Heavin

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06-23-2017 02:06 PM  88 days agoPost 8
Heli_Splatter

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USA

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I have one of these and can test later... but that is not what the documentation says. It is sold for the OPs purpose.

https://www.amainhobbies.com/align-...nk10381a/p18532

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06-23-2017 02:59 PM  88 days agoPost 9
Heli 770

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USA.

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I've used one,works great.
http://www.western-robotics.com/titan

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06-23-2017 03:33 PM  88 days agoPost 10
Pistol Pete

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Seffner, FL

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@ heli splatter
The Align step down is nothing but two diodes (aka passive) in paralell for higher Amp dissipation. As PH7 mentioned, it will only drop 0.7V

It is also sold as a package deal with their "RCE B6X" BEC which is rated to 5.8V OUTput. So when you add the step down, it drops to 5.1V for the servo connected to it. That is what the documentation states and hopefully the same one you have.

If you still decide to test with a 2S lipo, be ready for the magic smoke as you will burn the diodes and do so away from flammables. Not something you want to be holding when doing such.

* * * *** * * *
This is all i can find. This right?
Yes, below same one except cheaper and with wires already soldered to it.

https://www.amainhobbies.com/furiou...-0156-s/p579723

~~Enjoying the hobby one flight at a time~~

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06-23-2017 05:07 PM  88 days agoPost 11
Flyin for Jesus

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Dana Point, Ca. 92629

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06-23-2017 06:23 PM  88 days agoPost 12
Andy from Sandy

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Bedfordshire, UK

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As has been mentioned, use a HV servo. For the sake of $40

http://www3.towerhobbies.com/cgi-bi...01p?&I=FUTM0718

No extra connectors and a good servo for throttle duty.

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06-23-2017 11:43 PM  88 days agoPost 13
Heli_Splatter

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USA

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Very hard to disagree with Andy.

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06-24-2017 12:03 AM  88 days agoPost 14
JuanRodriguez

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The Villages, Florida

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Pretty much what I said in post 5 . But some want to make things more complicated than necessary......

Been there, done that and old enough to know better.....

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06-24-2017 12:07 AM  88 days agoPost 15
Heli_Splatter

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USA

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Well I learned that I would have released the smoke if I had tried my device. That helped.. but yes you are right. Capt. obvious.

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06-24-2017 02:36 AM  87 days agoPost 16
EEngineer

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TX

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"The Align step down is nothing but two diodes (aka passive) in paralell for higher Amp dissipation. As PH7 mentioned, it will only drop 0.7V"

That is misleading by Amain....

The Align K10381A, that Amain says replaces the Align K10331A, is a different device.....period.

The K10331A uses a single diode....in series...with it's connectors.

Inside the shrink wrap, the diode cathode is oriented towards the servo it connects to....so that when power is applied to the diode anode....current flows to the servo.

A basic silicon diode has an intrinsic "band gap" voltage of ~0.6V. When very little current is flowing, the voltage drop is ~0.6V....but when more current flows, the voltage drop is ~1V.

This can be seen from looking at the spec. data sheet of say a 1N4001 diode.....

So, the K10331A is to be used for a 6V "system" and "steps down" the voltage by 1V so that a 5V servo can be used.

The Align K10381A uses 2 diodes....which are NOT connected in parallel....but are connected in series....the cathode of 1 diode connected to the anode of the second diode.

The cathode of the 2nd diode is then connected to the servo, with the anode of the 1st diode connected to the RX output.

If the 2 diodes were connected in parallel, the voltage drop would still be 1V under current load, but it would handle more servo current, 2A instead of 1A for 1N4001 diodes.

If you look carefully at the package of the K10381A at Amain, the instructions can be seen that says....."for a 7.4V".

For 5V tail servos:

The K10331A is used for 6V to 5V "stepdown".

The K10381A is used for 7.4V to 5V "stepdown"...i.e. LiFe or Lipo voltage "stepdown".

The K10381A can be used "in a pinch" with a 6V system, but your 5V servo willing be running at ~4V.

Instead of the K10381A for a 7.4V system, I'd use an LM317 linear regulator instead.

This was a simple way to perform the "stepdown" for 5V servos....and for 5V servos that draw lower current.

A 1N4001 diode is good for 1A of current, as seen in the spec. data sheet.

For higher current 5V servos, the same function can be performed by using 1 diode(6 to 5V stepdown)...or 2 diodes oriented as in the above(7.4 to 5V)....but the diodes must be of higher amperage.

These higher amperage diodes can be obtained in the exact same physical dimensions.

This "stepdown" arrangement can easily be handmade....1 or 2 diodes(depending) and 1 servo extension lead and some shrink wrap...and just solder them together with the proper polarity and diode orientation.

Piece of cake, as they say.

Logo 600SXs, 700XX, 800XX

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06-24-2017 09:08 AM  87 days agoPost 17
Richardmid1

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Leeds, England

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I used one of these when I ran straight 2s li-fe. http://www.fast-lad.co.uk/store/pro...ducts_id=26970. You just have to splice the wires to keep the signal wire.

I trusted the bls451's on cyclic at this voltage and I had a Futaba hv tail servo BUT I had an Align 655 on throttle which I didn't trust at anything higher than 5v.

I will point out and will probably cause a heated debate but you WILL get better results using a faster throttle servo IF you are using a regular stand alone governor. If it is intergrated into a fbl unit where the throttle reacts instantly with stick inputs then speed is less important.

60% of the time, it works every time!

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06-24-2017 04:14 PM  87 days agoPost 18
EEngineer

rrProfessor

TX

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"I will point out and will probably cause a heated debate but you WILL get better results using a faster throttle servo IF you are using a regular stand alone governor."

No debate from me....you are correct.....

Logo 600SXs, 700XX, 800XX

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07-01-2017 01:31 AM  80 days agoPost 19
wifeorheli

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reno, nevada usa

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I bought some HV voltage servos and found a HV step down for throttle now I think I found one more problem my governor cannot handle more then 6v now I can put the regulator in between the beastx and governor BUT WHAT ABOUT THE SINGNAL WIRE? that wire come out hv?

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com

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07-01-2017 03:02 AM  80 days agoPost 20
Flyin for Jesus

rrApprentice

Dana Point, Ca. 92629

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Signal wire is not HV. I don't remember but its either 3.3v or 5.v.

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