07-06-2017, 09:17 PM | #1 |
Rock Crawler Join Date: Apr 2015 Location: Paola, ks
Posts: 925
| Dropping 1 volt?
I'm looking to get a pro modeler 470 for my wraith. I have a mamba x and I want to run the BEC at 8.4v. The problem is my airtronics 371wr will only go up to 7.6v. Could I just put a small resistor in line to drop 1 volt? I run 3s batteries. Thanks for the advice. Sent from my SM-N920V using Tapatalk |
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07-06-2017, 09:48 PM | #2 |
Rock Crawler Join Date: Mar 2016 Location: Zagreb, Croatia
Posts: 747
| Re: Dropping 1 volt?
Doesn't really work like that. Your resulting V would depend on the current (load). You could use a Zener diode, methinks. Or a string of regular rectifier diodes (a la 1N400x) but the voltage drop would vary a bit. Maybe best to get a separate small cheapo BEC @6V. |
07-06-2017, 09:53 PM | #3 |
I wanna be Dave Join Date: Nov 2014 Location: West Texas
Posts: 2,654
| Re: Dropping 1 volt?
Just get the Holmes hobbies bypass and your good Sent from my SAMSUNG-SM-G935A using Tapatalk |
07-07-2017, 05:06 AM | #4 |
Rock Crawler Join Date: Apr 2015 Location: Paola, ks
Posts: 925
| Re: Dropping 1 volt? |
07-07-2017, 05:23 AM | #5 |
I wanna be Dave Join Date: Jun 2016 Location: Deep in the Everglades
Posts: 5,816
| Dropping 1 volt?
Power direct to servo, internal bec only powers rx You still need an external bec though Hang up and Drive |
07-07-2017, 05:33 AM | #6 |
Rock Crawler Join Date: Apr 2015 Location: Paola, ks
Posts: 925
| Re: Dropping 1 volt?
So I cant just set mamba x BEC to 8.4V and bypass power wire directly to the servo? This is the first RX I have had that can not handle 8.4V. The BEC will then also supply 8.4V to power the RX on a seperate lead to the servo. Maybe I will use my rx462 or rx471. They can supposedly handle the 8.4V from the mamba x BEC. Again I am not running the power to the servo through the RX. I just want to prevent using another device on my toy.
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07-07-2017, 05:35 AM | #7 |
Rock Crawler Join Date: Apr 2015 Location: Paola, ks
Posts: 925
| Re: Dropping 1 volt? that is a nice little harness. Keeps things clean and plug and play. Me likey. Now if I can hit the RX with 8.4V to save my Castle external BEC for a rainy day. |
07-07-2017, 05:51 AM | #8 |
I wanna be Dave Join Date: Jan 2005 Location: Raleigh-ish vicinity
Posts: 3,846
| Re: Dropping 1 volt?
While the full 470 oz of torque is wonderful, 440 at 7.4V is plenty and requires little more than setting the Mamba X's BEC and plugging it in.
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07-07-2017, 06:08 AM | #9 | |
Rock Crawler Join Date: Apr 2015 Location: Paola, ks
Posts: 925
| Re: Dropping 1 volt? Quote:
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07-07-2017, 06:09 AM | #10 |
I wanna be Dave Join Date: Jun 2016 Location: Deep in the Everglades
Posts: 5,816
| Re: Dropping 1 volt? |
07-07-2017, 07:40 AM | #11 |
Rock Crawler Join Date: Mar 2016 Location: Zagreb, Croatia
Posts: 747
| Re: Dropping 1 volt?
Bypass means 3s direct to servo, no?
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07-07-2017, 07:51 AM | #12 |
I wanna be Dave Join Date: Jan 2004 Location: Detroit
Posts: 3,583
| Re: Dropping 1 volt?
You need to power all servos and the receiver. You can power everything from the external BEC or the Internal ESC BEC. This means 1 voltage to all servos and receiver. In this case you'd get whatever the BEC is set to. This might be fine for your Steering Servo, but small servos or winches might have issues with that - as might some receivers. A Bypass will power one (or more depending on the bypass) item at the External BEC settings. So lets say you have a HV servo capable of 8.4v but your receiver or other servos only handle 6v. The bypass would be wired to send the BEC's 8.4v to the HV servo only and the remaining items could be powered by the ESC's internal BEC. |
07-07-2017, 10:22 AM | #13 |
Rock Crawler Join Date: Apr 2015 Location: Paola, ks
Posts: 925
| Re: Dropping 1 volt? |
09-26-2017, 03:43 AM | #14 |
Newbie Join Date: Sep 2017 Location: Denver
Posts: 1
| Re: Dropping 1 volt?
Yes, rectifier diode will be good for you. Just look at definition of it and you will have your voltage drop
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09-26-2017, 04:17 AM | #15 |
Quarry Creeper Join Date: Apr 2017 Location: Melbourne Australia
Posts: 404
| Re: Dropping 1 volt?
you could also use a cheap hobbywing ubec to drop down to 6v
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09-26-2017, 10:30 AM | #16 | |
Rock Crawler Join Date: May 2016 Location: SoWIs
Posts: 618
| Re: Dropping 1 volt? Quote:
You could also get a really cheap hobbywing BEC clone that gets power from either battery or MMP BEC power and drop that to a safe 5-6v for just the receiver. Both solutions above feed MMP BEC 8.4v direct to the servo. | |
09-26-2017, 10:43 AM | #17 |
Rock Crawler Join Date: Apr 2015 Location: Paola, ks
Posts: 925
| Re: Dropping 1 volt?
First, mamba x will only go up to 8.0v. Didn't know that. Next, my rx seems to be ok with 8.0v. Now my problem is I need a servo for my dig unit. Finding a cheap servo to do this that can handle the 8.0v is tough. Thinking about a small 2s 350ma battery to handle this workload. I know John recommends only using a battery and to always forgo the BEC of any sorts. The battery will be a much cleaner power source. I should have just put an shv500 on it. Direct to 3s and I could have set my BEC to any voltage. Sent from my SM-N920V using Tapatalk |
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