5V LEDs and 7.4V BEC - can I make it work?

[Dan B.]

I clearly read it perfectly..lol he can get the 5 volts from the 7.4 lipo I showed in the PIC...Mr Dan your a day late

He’s afraid the 7.4 volts from the LiPo will fry his 5v lights. What are you smoking? It must be better than mine.

 

[King blitz]

He’s afraid the 7.4 volts from the LiPo will fry his 5v lights. What are you smoking? It must be better than mine.

Bro ,it's been said already that alls he needs with that lipo is a voltage regulator or a converter. Bro you need to send me sh+t you got cause it's lethal

 

[Tex Koder]

Bro ,it's been said already that alls he needs with that lipo is a voltage regulator or a converter. Bro you need to send me sh+t you got cause it's lethal

 

[Dan B.]

Bro ,it's been said already that alls he needs with that lipo is a voltage regulator or a converter. Bro you need to send me sh+t you got cause it's lethal

He doesn’t want a separate LiPo, yo!

 

[King blitz]

He doesn’t want a separate LiPo, yo!
View attachment 422054

This was already established yesterday..lol you showed up to the party late ..Yo Yo

 

[King blitz]

Wtf damn that's huge ,looks like a mofokin burrito he smokin

 

[Barmaleus]

 

[RCbuzz]

Is that a meme generator?

 

[Barmaleus]

Is that a meme generator?

Yessir, my favorite! https://imgflip.com/memetemplates

 

[FPVkabina]

My goodness if you knew @King blitz what i was running from my packs you would hang your head in shame for wanting to power a single 5v light with a separate lipo my mind is blown.

My packs are powering very power hungry devices.

I'm running a VERY powerful vtx..now that thing is power hungry.

Anyone who's into fpv here give me your vtx mW output rating...then I'll tell you mine..oh wait 99.9% of you use dji so I've already won.

 

[FPVkabina]

Meme generators very cool.

 

[King blitz]

My goodness if you knew @King blitz what i was running from my packs you would hang your head in shame for wanting to power a single 5v light with a separate lipo my mind is blown.

My packs are powering very power hungry devices.

I'm running a VERY powerful vtx..now that thing is power hungry.

Anyone who's into fpv here give me your vtx mW output rating...then I'll tell you mine..oh wait 99.9% of you use dji so I've already won.

Suggesting a separate power source when running lights is not out of the ordinary.
Many reasons for doing so.
Some receivers don't have extra channels to support multiple, light sets.
SMaller ESC's don't have a large BEC .
Some run a large power hungry servos ..
My point is that the option of running a separate power source is available..and I've been doing it with no issues and I don't see a issue ..I have in the past ran multiple light sets with well over 50 LEDs with no issues with that tiny , little lipo I showed ..

 

[FPVkabina]

Suggesting a separate power source when running lights is not out of the ordinary.
Many reasons for doing so.
Some receivers don't have extra channels to support multiple, light sets.
SMaller ESC's don't have a large BEC .
Some run a large power hungry servos ..
My point is that the option of running a separate power source is available..and I've been doing it with no issues and I don't see a issue ..I have in the past ran multiple light sets with well over 50 LEDs with no issues with that tiny , little lipo I showed ..

Oh all good...hell i was running another lipo for my fpv gear before my brain finally worked and said just use a harness and solder a connector onto the end of that and your done..i have many brain farts.

Yeah those little lipos are awesome, i had one of those sitting on the front axel of an old MOA crawler i had years ago, that extra weight up front really helped it get up the steep stuff.

 

[Barmaleus]

After some more investigation, help from my cousin and soldering - first quick successful test! The lights are working at 7.4v with no risk of burning
From the factory, both lights have 100 Ohm resistors. After a bunch of measurements and calculations (directed by my cousin, because I have zero knowledge in this field) the conclusion was that the front LED needs a 220 Ohm resistor and the rear needs 300 Ohm.

Bought some resistors and did my rookie soldering. Had this Kraton 4s ESC laying around for a quick test. Now need to connect the lights to the DumboRC light switch and try it out in Kraton 6s. Then program it to work with the Radiolink transmitter.

The rear light seems to have a good fit with the rear bulkhead. Front - not sure yet, need to look into it.

Overall, I imagine it will work great and help driving in the dark

 

[King blitz]

7.4 volt huh imagine that

 

[RCbuzz]

After some more investigation, help from my cousin and soldering - first quick successful test! The lights are working at 7.4v with no risk of burning
From the factory, both lights have 100 Ohm resistors. After a bunch of measurements and calculations (directed by my cousin, because I have zero knowledge in this field) the conclusion was that the front LED needs a 220 Ohm resistor and the rear needs 300 Ohm.

Bought some resistors and did my rookie soldering. Had this Kraton 4s ESC laying around for a quick test. Now need to connect the lights to the DumboRC light switch and try it out in Kraton 6s. Then program it to work with the Radiolink transmitter.

The rear light seems to have a good fit with the rear bulkhead. Front - not sure yet, need to look into it.

Overall, I imagine it will work great and help driving in the dark


View attachment 422364

Nice work there!

I think its really cool you investigated the root cause and calculated the proper resistors with your cousin for the application.

Electronics is a fun field, hope you enjoy it too!

 

[Barmaleus]

7.4 volt huh imagine that

Haha, yes I wanted to make sure nothing gets burned at this voltage. So far it seems the LEDs will do fine with the new resistors. Hoping to do a test install into K6 tonight.

Nice work there!

I think its really cool you investigated the root cause and calculated the proper resistors with your cousin for the application.

Electronics is a fun field, hope you enjoy it too!

Thanks! Electronics and numbers feel like black magic to me, so I always accept help when it is offered

 

[Barmaleus]

Connected everything and it works! Major step done. Next is fitting the lights to the chassis. Want to make sure the lights don't get destroyed in the first bash =)

 

[Dan B.]

I don't see a issue ..I have in the past ran multiple light sets with well over 50 LEDs with no issues with that tiny , little lipo I showed ..

So THAT’S why we can see your cars from space!

7.4 volt huh imagine that

Resistors, man. Resistors.

From the factory, both lights have 100 Ohm resistors. After a bunch of measurements and calculations (directed by my cousin, because I have zero knowledge in this field) the conclusion was that the front LED needs a 220 Ohm resistor and the rear needs 300 Ohm.

Jeez, I feel shame now. Should I have been putting this much science into my LED’s? I just buy $2 lights from AliExpress that say 5v and see how long they’ll last at 8.4v.

 

[Barmaleus]

I just buy $2 lights from AliExpress that say 5v and see how long they’ll last at 8.4v.