Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

[BJ43]

I now use this charger that just plugs into 110v and does not need a 12v source.

Radio Control Planes, Helicopters, Cars, Boats, FPV and Quadcopters - Hobbyking 

 

[texanator]

BJ, That's a very nice looking setup you got going on there.
Definitely something for me to look at for a home setup.
Granted, it might anger my better half.

 

[BJ43]

BJ, That's a very nice looking setup you got going on there.
Definitely something for me to look at for a home setup.
Granted, it might anger my better half.

Thanks, If I had the talent I would make a 3D box for the raptor with the lipo. My box is larger than needed. Still may make a 3D the old fashion way, cardboard, fiberglass, and carbon fiber.

 

[Rapture]

My boxes only seem to get better with time and hopefully will soon have a 100% perfect box. We are at about 90%. But back to me being a perfectionist. Nothing is ever good enough(perfect). Darn.

 

[texanator]

My boxes only seem to get better with time and hopefully will soon have a 100% perfect box. We are at about 90%. But back to me being a perfectionist. Nothing is ever good enough(perfect). Darn.

You have that black box listed on ebay for a grand. That's crazy.
Well, none of my business. A sucker is born every minute.

 

[mark-in-dallas]

Hey Rapture, do you by any chance have the part numbers for the potentiometer and dial you used for that mod?

 

[david4500]

Amazing mod by Rapture.

Link to the potentiometer:

P16SNP471MAB15 Vishay / Sfernice | Mouser

 

[BJ43]

Amazing mod by Rapture.

Link to the potentiometer:

P16SNP471MAB15 Vishay / Sfernice | Mouser

470 ohms ?????

 

[Rapture]

[edited]

The pot is 470. Wish it was a little less resistance. But turning it all the way down is almost like turning off the mod lol. 2.5 volts doesn't produce ANY vapor even at .3 ohms.

 

[Rapture]

Amazing mod by Rapture.

Link to the potentiometer:

P16SNP471MAB15 Vishay / Sfernice | Mouser

Thanks man

 

[mark-in-dallas]

Amazing mod by Rapture.

Link to the potentiometer:

P16SNP471MAB15 Vishay / Sfernice | Mouser

Thanks much!

deleted

[edited]

The pot is 470. Wish it was a little less resistance. But turning it all the way down is almost like turning off the mod lol. 2.5 volts doesn't produce ANY vapor even at .3 ohms.

I can live with it limiting down to 2.5V, as long as it can still hit 6V.

 

[texanator]

The pot is 470. Wish it was a little less resistance. But turning it all the way down is almost like turning off the mod lol. 2.5 volts doesn't produce ANY vapor even at .3 ohms.

You can add a resistor parallel across the pot to lower it's range. I think 350 ohm.
1/(1/470)+(1/350)) = 200.6 or so (someone say something if I'm wrong, please)

Edit:
and pot at 0 ohms paralleled with 350 ohm resistor should be:
1/(1/0+1/350) = 1/(∞+1/350) = 1/∞ = 0 ohm. Any resistance in parallel with a 0 ohm
resistance or short will be 0 ohm or short. Therefore we call the short a "bypass"
because current will be detoured to the 0 ohm route.

all in all, that should make it a 0-200ohm pot. Right?

 

[Rapture]

You can add a resistor parallel across the pot to lower it's range. I think 350 ohm.
1/(1/470)+(1/350)) = 200.6 or so (someone say something if I'm wrong, please)

Edit:
and pot at 0 ohms paralleled with 350 ohm resistor should be:
1/(1/0+1/350) = 1/(∞+1/350) = 1/∞ = 0 ohm. Any resistance in parallel with a 0 ohm
resistance or short will be 0 ohm or short. Therefore we call the short a "bypass"
because current will be detoured to the 0 ohm route.

all in all, that should make it a 0-200ohm pot. Right?

This sounds interesting. Thanks. I'll give it a try if someone can confirm. I failed math class.

 

[david4500]

I just used the 470 ohm potentiometer with a 350 ohm resistor connected in parallel (220 ohm resistor in series between trim pin and pot). It has the same range as a 200 ohm pot, but the pot wipe is affected over 50% of the voltage change is seen in the last quarter turn.

350 ohm resistor:
270-350-RC Xicon | Mouser

Output Range - 3.36-5.98v (+2.62)

Change in voltage with potentiometer turn:

1st qrt - 3.36-3.48v (+0.12v, 4.5%)
2nd qrt - 3.48-3.78v (+0.30v, 11.5%)
3rd qrt - 3.78-4.50v (+0.72v, 27.5%)
4th qrt - 4.50-5.98v (+1.48v, 56.5%)

 

[Rapture]

I just used the 470 ohm potentiometer with a 350 ohm resistor connected in parallel (220 ohm resistor in series between trim pin and pot). It has the same range as a 200 ohm pot, but the pot wipe is affected over 50% of the voltage change is seen in the last quarter turn.

350 ohm resistor:
270-350-RC Xicon | Mouser

Output Range - 3.36-5.98v (+2.62)

Change in voltage with potentiometer turn:

1st qrt - 3.36-3.48v (+0.12v, 4.5%)
2nd qrt - 3.48-3.78v (+0.30v, 11.5%)
3rd qrt - 3.78-4.50v (+0.72v, 27.5%)
4th qrt - 4.50-5.98v (+1.48v, 56.5%)

Thanks for posting this and trying this out. Much appreciated. I'm still just a bit confused on how you wired it up though. Im an idiot lol. Not really but I'm a more visual learner.

 

[david4500]

 

[branflan]

Chips are in stock at Arrow...Get em while you can.

CC109130911 for GE Energy (formerly Lineage Power) | Arrow Electronics Components

 

[mamu]

Thanks for the heads up, branflan! I'm totally stashed with Raptors now.

 

[Visus]

OOS at this posting --wow

 

[jeepster67]

gone now.