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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 01-13-2008, 07:23 PM   #21 (permalink)
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I hooked this up and checked before and after the diode.

Using 7.4V lipo throught the align 2 in 1 and get 5.84V before and 5.56V after. is this still ok for the ds8900g?

nevermind.. read above post.. thanks,..
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Old 02-14-2008, 10:33 AM   #22 (permalink)
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Would a resistor not work in this situation? When I told the folks at the electronics that I needed a diode and where I was going to use they looked at me like I had three heads.
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Old 02-14-2008, 10:53 AM   #23 (permalink)
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If they don't know what a rectifier diode is, they should be working at IHOP
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Old 02-14-2008, 12:15 PM   #24 (permalink)
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Quote:
Originally Posted by stikflyer View Post
Would a resistor not work in this situation?
No. You want a fixed voltage drop with variable current. A resistor will give you a varying voltage drop as current changes. Current will change as servos move.

For a resistor voltage drop calculation: voltage=current(amps) X resistor(ohms)
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Old 02-14-2008, 05:43 PM   #25 (permalink)
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Thanks, I just picked up a couple 1N4001's at The Source.
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Old 03-05-2008, 06:00 AM   #26 (permalink)
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what diode do i use to stepdown from 6v to 5v? thanks
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Old 03-05-2008, 06:18 AM   #27 (permalink)
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Any Silicon diode shoud do - they all drop down 0.7v eg 1N4001's
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Old 03-05-2008, 07:02 AM   #28 (permalink)
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I have a question about servos rated for use with a 4.8 volt packs. Since all of my freshly charged 4.8 volt packs come off the charger at close to 6 volts, right around 5.7 to 5.8 volts actually. Is the the interest in regulating down to 5.1 volts to protect the servo or is it that it just works better. I would think if a servo could handle 5.7 volts at the beginning of the day it would be fine all day long as long as its regulated to and never goes over that voltage.
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Old 03-05-2008, 07:26 AM   #29 (permalink)
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Quote:
Originally Posted by Mercuriell View Post
Any Silicon diode shoud do - they all drop down 0.7v eg 1N4001's
I would qualify that by saying any silicon *rectifier* diode. I wouldn't want to use a switching diode due to the current draw.
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Old 03-05-2008, 11:45 AM   #30 (permalink)
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Quote:
Originally Posted by TheBum View Post
I would qualify that by saying any silicon *rectifier* diode. I wouldn't want to use a switching diode due to the current draw.


Quote:
Originally Posted by jpappano View Post
I have a question about servos rated for use with a 4.8 volt packs. Since all of my freshly charged 4.8 volt packs come off the charger at close to 6 volts, right around 5.7 to 5.8 volts actually. Is the the interest in regulating down to 5.1 volts to protect the servo or is it that it just works better. I would think if a servo could handle 5.7 volts at the beginning of the day it would be fine all day long as long as its regulated to and never goes over that voltage.
That's exactly right ! - people equate 4.8V with 4 pack NiMH/Cd and 6V with 5 pack but as you point out fresh from the charger they are way over this level. It's likely that a regulated 5.9V would be OK for the delicate 4.8V only tail servos like the 9254/6/7 and I've flown them like this occasionally after forgetting the drop-down. Much depends on gain setting and flying style also in determining tail servo loads but as they work fine at 5.1V I guess they may have a little more longevity with a drop down in place.
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Old 03-20-2008, 05:59 PM   #31 (permalink)
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Thanks for the info. I ended up taking the align regulator harness apart and soldered the diode directly to the servo wires:

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Old 03-20-2008, 07:30 PM   #32 (permalink)
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hey all

Could someone please do a pic sequence of this for those of us that are not so electronically proficient.
ive been waiting for 2 weeks for a frickin step down
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Old 03-21-2008, 06:40 AM   #33 (permalink)
 
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Sorry if this is getting a bit redundent but which would be better to go with say the N4001 with 1A and Peak Inverse Voltage (PV): 50. Or the N4004 with 1A and Peak Inverse Voltage (PV): 400. Or the 1N5404 with 3A and Peak Inverse Voltage (PIV): 400 ?

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Old 03-21-2008, 11:40 AM   #34 (permalink)
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Is it safe to say that a feller can cut the leads down on theses, if so what is too much?
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Old 03-21-2008, 07:38 PM   #35 (permalink)
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On the diode, sure cut them to any length. Just leave enough to solder.

WRT which one, a 1N4001 is fine for the tail servo, unless you get binding, then the 3A 1N5404 would be better. It is only going to see a max of 6 volts.

But buy which ones are cheapest.
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Old 03-22-2008, 08:32 AM   #36 (permalink)
 
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Thanks Pine.

The cost is pretty insignificant, about a dollar one way or another, I guess if the 3A 1N5404 is the best one to use I should just go with that one.

Thanks
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Old 04-02-2008, 10:36 AM   #37 (permalink)
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So...if I'm using a 5 cell NiMh pack (6V nom), what are my options for protecting the 9254 on my rudder?
a. Switch to a 4.8V nom pack.
b. Switch to a 7.4V LiPo with the Align 2-1 and add a diode.
c. Keep the 6.0V NiMh and add a BEC to the loop and lose higher voltage to the other servos.
d. Keep the 6.0V NiMh and try stacking diodes before the rudder servo to a safe voltage.

Is there anything else besides a 6.0V capable servo or quit flying that I'm missing?
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Old 04-02-2008, 06:34 PM   #38 (permalink)
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I think I found a solution with the help from my LHS.

Spektrum VR5203 Dual Output Regulator

Anyone have any experience with one? Good or bad?
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Old 05-03-2008, 04:32 PM   #39 (permalink)
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how come when I cut the shrink tubing off my Align step down there were 2 diodes in it...for the record they were each installed opposite each other.any one?
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Old 05-07-2008, 10:35 AM   #40 (permalink)
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Quote:
Originally Posted by 929freak View Post
how come when I cut the shrink tubing off my Align step down there were 2 diodes in it...for the record they were each installed opposite each other.any one?
Hi all..

The Align step-down says "two way" I`m guessing that they have put 2 diodes with their ends switched to allow current flow in both directions..
I just picked up a few 1n4001 diodes and plan on putting them into my servo lead.
Would it be worth me putting 2 as Align have?

Hi 929freak, did you notice if the diodes were soldered with their ends switched?
You said "for the record they were each installed opposite each other" but not sure if you meant parallel or switched..

Thanks.. Kev..
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