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Tamiya TEU-104BK modification for 2S LiPo cut-off

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Tamiya TEU-104BK modification for 2S LiPo cut-off

Post by laneboysrc on Sat 24 Aug 2013 - 22:05

Hi everyone! geek

Many Tamiya kits available on sale today still come with the TEU-104BK ESC. This ESC is perfectly fine for running brushed motors, but does not contain a BEC and its low voltage cut-off is too low for LiPo batteries.



The missing BEC is easily dealt with: either use "high voltage" compatible servo and receiver, or a cheap external BEC.

Fortunately it is also easy to modify the ESC to have a LiPo compatible voltage cut-off -- assuming you are able to solder a tiny surface-mount resistor.

By default the voltage cut-off is set to 4.5V. We measured this by connecting the ESC to a lab-power-supply, slowly lowering the voltage until the ESC cut off and started to flash the LED.

For a 2S LiPo 4.5V is way below the voltage that damages the battery, we rather need a cut-off at 6V or slightly higher.



The ESC implements the voltage cut-off through its microcontroller. A resistor divider comprising of R1 and R2 on the PCB divide the battery voltage down to a level that can be measured by the microcontroller. R2 is 10 KOhm, and R1 is 27 KOhm. By lowering the resistor value of R2 we can increase the threshold for cut-off from 4.5V to 6.2V. We can lower the resistor by adding a 20 KOhm resistor in parallel to R2. This way we don't have to remove components from the ESC.



The components used in the ESC are tiny 0402 SMD parts. But due to the way the board is layout it is possible to use a larger 0805 SMD 20 KOhm resistor, which is easier to handle by humans.



We laid the 20 kOhm resistor onto R2 and soldered it to the bottom pad. The other side of the resistor we soldered on the bottom pad of R1, which is directly connecting to R2.

Depending on your soldering skills it does not take more than 10 minutes to modify the ESC. With the modification the ESC shuts off at just the right time when your LiPo batteries deplete.

For those in Singapore who'd like to have their ESC modified, don't hesitate to PM me! geek
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Re: Tamiya TEU-104BK modification for 2S LiPo cut-off

Post by Marpek on Sat 24 Aug 2013 - 22:10

You rocks mate!Very Happy 
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Re: Tamiya TEU-104BK modification for 2S LiPo cut-off

Post by Liew on Sun 25 Aug 2013 - 20:18

Good job Very Happy
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Re: Tamiya TEU-104BK modification for 2S LiPo cut-off

Post by boolean21 on Mon 26 Aug 2013 - 11:19

solid soldering skills and eyesight!!

my eyes will go "pa jiao" if i stare at the smd resistors too long... Very Happy

good work bro!!

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Re: Tamiya TEU-104BK modification for 2S LiPo cut-off

Post by laneboysrc on Mon 26 Aug 2013 - 22:30

Thanks guys!

boolean21 wrote:my eyes will go "pa jiao" if i stare at the smd resistors too long... Very Happy
My eyes are also quite bad already, but with a 5x magnifier lamp it is no issue working on those small parts What a Face  
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Re: Tamiya TEU-104BK modification for 2S LiPo cut-off

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