SR315 LED Power Source

[Ralph68]

I've got the DX3 w/SR315 setup.

Aux1 is being used by a cooling fan on the motor heat-sync.

I have added 2 white and 2 red leds for front and rear lights. I'm not sure where to safely grab the power from?

My options are:
1. Y split Aux1
2. Grab power from the Batt plug on the Rx.
3. Buy a SR515

like I said I'm not sure the best way to do this. I know the LED lights are 5v but I'm not sure what the fan is drawing?
I don't want to burn out anything pulling to much power from a single plug, maybe someone that has done this before can help me out?

[coxbros1]

Using the Y should be ok....depends on what esc u have and how many amps the bec in is.

[matt1ptkn]

I agree. The LEDs won't pull very much current at all, so you should be fine with any of those options.

[Ralph68]

I'm using the ARRMA BLX100 ESC.
BEC Voltage 6V
BEC Current 4A
https://www.arrma-rc.com/part/AR390069

Thanks for the reply!

[coxbros1]

yep the "Y" will work with that unit

[jwscab]

The LED's don't draw much. No worries pretty much any path you take. Are the LED's designed to drop in, ie. do they have a built in resistor?

[Ralph68]

No resistor on the lights, they're a cheapo setup I got off ebay.

I want this setup correctly if I need one let me know I'll add it.

https://www.ebay.com/itm/1-10-1-8-Upgrade-4-LED-Light-Set-Headlight-Taillight-for-HSP-RC-Cars-US/254375421227?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

[jwscab]

Yes those have resistors. You can see the little lumps in the heat shrink near the leds. Be sure to keep them intact.

[Ralph68]

Thanks very much for the help I really dislike going at this stuff totally blind so please know I appreciate the reply.

Here's a thought I just had.. Can I run the cooling fan off the Batt plug?

This would free up chnl 3 (Aux1) to use for lights?

SPMSR315-450.jpg (76.91 KiB) Viewed 2319 times

SPMSR315-450.jpg (76.91 KiB) Viewed 2319 times

[jwscab]

Usually they have a nice heavy trace connecting all the power pins so that should be fine.