Post by rickc on May 22, 2014 18:21:21 GMT -8
The systemic problem of "power brownouts" that were affecting my QRX350 are now solved. The quad was exhibiting power problems whereby all of the ESCs were shutting down to the point whereby the bird was falling out of the sky . Another related problem had the quad locking up by itself needing a manual resetting .
These problems are all caused by a weakly designed power supply circuit of the main power board ! Having tested my solution for some 24 flight minutes , I beleive that this problem is finally cured . I installed a $3 US "buck boost" power supply converter found on Ebay .
The installation of the buck-boost PSU requires that the quad be disassmbled to enable some minor soldering . Having the bird apart , this is the required procedure for accomplishing this power upgrade :
1) Pre-wire the buck-boost by soldering an old servo lead to the output power side . (No white signal connection needed)
2) Solder a red and black wire pair to the input side of the buck-boost .
3) Important that this unit be PRE-CALIBRATED to an output voltage of +5 as it capable of much higher voltages . IMPORTANT ! ! !
4) Solder the power input wire pair to any convenient 11.1 volt place in the quad .
5) UN-SOLDER the red wire of the power connector leading to the CPU module and clip the end off as it is no longer required . (center wire of 3)
6) Plug the buck-boost PSU into ANY unused receiver channel or battery connection of the RC receiver to power the system . Zip tie PSU in place .
7) Re-assemble the quad .
FLY ! FLY !
NOTES : The old power connection from the main board still has the GROUND (black) and the 3.3 volt (white) wires connected to the main CPU module .
This ensures that there is still a viable system grounding between the modules as well as a 3.3 volt power source for the GPS and sensors . The
receiver and CPU modules are now powered thru the buck-boost PSU .
Always test fly with freshly charged batteries .
Happy Flying ! RIckC
These problems are all caused by a weakly designed power supply circuit of the main power board ! Having tested my solution for some 24 flight minutes , I beleive that this problem is finally cured . I installed a $3 US "buck boost" power supply converter found on Ebay .
The installation of the buck-boost PSU requires that the quad be disassmbled to enable some minor soldering . Having the bird apart , this is the required procedure for accomplishing this power upgrade :
1) Pre-wire the buck-boost by soldering an old servo lead to the output power side . (No white signal connection needed)
2) Solder a red and black wire pair to the input side of the buck-boost .
3) Important that this unit be PRE-CALIBRATED to an output voltage of +5 as it capable of much higher voltages . IMPORTANT ! ! !
4) Solder the power input wire pair to any convenient 11.1 volt place in the quad .
5) UN-SOLDER the red wire of the power connector leading to the CPU module and clip the end off as it is no longer required . (center wire of 3)
6) Plug the buck-boost PSU into ANY unused receiver channel or battery connection of the RC receiver to power the system . Zip tie PSU in place .
7) Re-assemble the quad .
FLY ! FLY !
NOTES : The old power connection from the main board still has the GROUND (black) and the 3.3 volt (white) wires connected to the main CPU module .
This ensures that there is still a viable system grounding between the modules as well as a 3.3 volt power source for the GPS and sensors . The
receiver and CPU modules are now powered thru the buck-boost PSU .
Always test fly with freshly charged batteries .
Happy Flying ! RIckC