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Thread: FlySky BS6 Receiver voltage on TRX-4

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Old 01-20-2021, 08:20 PM   #1
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Default FlySky BS6 Receiver voltage on TRX-4

Hey everyone, I recently decided to put an old hobbywing ezrun brushless system in my TRX-4, out of an older car from back before everyone used 2.4Ghz and instead had crystals in their transmitter and receiver. What I didn't realize when I did this is that those old esc's put more than the standard 6v into the receiver, and using my stock traxxas receiver it worked for about half an hour. Then it didn't. So I did the research and asked around and found out about the voltage thing and figured I'd fried my receiver. Not great considering I'm a 17 year old without a job, who can't really afford a 5ch transmitter and receiver. Luckily I've got a good family who got me a FlySky GT5 and BS6 6ch combo for christmas, which I'm really grateful for. Anyway, I've got it running at the moment back on the stock traxxas xl-5 esc and titan motor, but I kinda still want to try the brushless swap again.

My question is: Will the FS-BS6 receiver take more than 6v? Or will it just be fried like the TQi receiver?

This is the old Hobbywing system I used:
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Old 01-20-2021, 11:14 PM   #2
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Default Re: FlySky BS6 Receiver voltage on TRX-4

According to Flysky, the FS-BS6 will take 4.0V - 8.4V input. Any more than 8.4V output from the ESC will be a problem for the BS6. I don't own any Traxxas but I'm pretty sure the Traxxas ESC had a BEC output voltage of 6V. Can't find any information on the voltage range for the receiver but I'm guessing by default the receiver is rated max. 6V.
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Old 01-20-2021, 11:23 PM   #3
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Default Re: FlySky BS6 Receiver voltage on TRX-4

If it has any of the micro servos do not run at 7.4v they will not survive for long.The micro servos are pretty sensitive
The safer way would be to disconnect the red+(generally the center wire)
On the esc and use a bec set to 6v and power the system that way.


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Last edited by jaymann; 01-20-2021 at 11:28 PM.
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Old 01-20-2021, 11:53 PM   #4
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Default Re: FlySky BS6 Receiver voltage on TRX-4

Quote:
Originally Posted by nightcrawler48 View Post
According to Flysky, the FS-BS6 will take 4.0V - 8.4V input. Any more than 8.4V output from the ESC will be a problem for the BS6. I don't own any Traxxas but I'm pretty sure the Traxxas ESC had a BEC output voltage of 6V. Can't find any information on the voltage range for the receiver but I'm guessing by default the receiver is rated max. 6V.
I'm only running it on a 2s lipo, so it'll never get more than 8.4v because that's the maximum charge voltage. Thanks for the info mate

Quote:
Originally Posted by jaymann View Post
If it has any of the micro servos do not run at 7.4v they will not survive for long.The micro servos are pretty sensitive
The safer way would be to disconnect the red+(generally the center wire)
On the esc and use a bec set to 6v and power the system that way.
Sounds right, where could I get a bec that i could set to 6v? Also, I have some other micro servos that are out of an old rc plane which also used the old system with crystals, so I wonder if they can handle the 8.4v that the battery would produce at max charge?
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Old 01-21-2021, 03:14 AM   #5
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Default Re: FlySky BS6 Receiver voltage on TRX-4

Castle has a great bec, u can program the voltage on it. There are some other that can be changed between 5-6v as well
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Old 01-21-2021, 05:47 AM   #6
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Default Re: FlySky BS6 Receiver voltage on TRX-4

That EzRun ESC should have a 6V/1.5A BEC, not "more than the standard", whatever that means...
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Old 01-21-2021, 04:50 PM   #7
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Default Re: FlySky BS6 Receiver voltage on TRX-4

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Originally Posted by Ninomaniac View Post
That EzRun ESC should have a 6V/1.5A BEC, not "more than the standard", whatever that means...
I thought so too, but apparently the old AM receivers ran off more than 6v, so old esc's outputs were more than 6v into the receiver. This is one of those old esc's, if Hobbywing still makes it, I'm sure the newer ones do have a 6v BEC, but old ones like this don't apparently.
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Old 03-06-2021, 03:38 PM   #8
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Default Re: FlySky BS6 Receiver voltage on TRX-4

Ok everyone, I'm sorry about this, but apparently the information I shared about the old esc producing more than 6v from the bec is false. I took a multimeter to the esc-receiver cable on the hobbywing brushless and got back a reading of 6v. It's confusing though 'cause I thought that the esc was why the receiver died, but apparently not, so my traxxas receiver died for seemingly no reason? Does anyone know why it might have died? Is it common for the standard receiver to die after a couple of years?
Thanks everyone.
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