$8 Battery Mod (Help Bruce)

[av8nmac]

Bruce I figured out why my voltage display was all over the place. By the looks of it I applied way too much heat and delaminated the trace from the 512 resistor to the (yellow) component above it. I was hoping with your expertise, you could help me salvage this project. I have attached a few pics of the damage. I would appreciate any help you could offer.

Thanks,

Paul

[RCModelReviews]

I'll hunt up my schematic and look see what the values are. You can bridge the missing copper with a regular resistor to replace the SMD one that's now missing.

[av8nmac]

Your a life saver Bruce, your help is greatly appreciated.

Paul

[av8nmac]

Bruce, is the net result to have a 3.15k resistor ( 5.12k parrallel with a 8.2k) in place of the 5.12k resistor?

Thanks,

Paul

[av8nmac]

Bruce, any luck finding the schematics for the Tx ?

Thanks,
Paul

[soopy]

av8nmac - try this link, courtesy of the th9x open source firmware documentation:
http://th9x.googlecode.com/files/th9x_scheme.pdf

[av8nmac]

Thanks again for the link to the schematics. From what I can tell by soldering the 8.2k resistor in, we are in effect making the circuit think it is a 3.1k resistor instead of the 5.12k resistor that's surface mounted. Any electronically inclined folks concur with this? This problem is way above my pay grade. Any help is appreciated.

Thanks,

Paul

[av8nmac]

Well, fixed my problem by soldering in a 3.2k resistor (close as I could get to 3.1k).

Thanks to all that offered help.

Paul

[RCModelReviews]

Yes, the additional resistor is to change the total resistance to a lower value (can't remember what I calculated it to be but it was round 5.?? K Ohms. I figured it would be easier for most folks just to jumper the existing resistor with a readily available value than to remove the SMD one and find a close match in SMD form.

[xxxcellarator]

Hi guys, im having a little trouble of my own. Im really hoping someone can charm in on my issue. I installed the 8.2K ohm resistor and when i turned the radio on i got a reading of about 10.8v (with the Li-ion batteries of course). But to my surprise, about 15 seconds later, the voltage readout just shot up to 13.6v and it has stayed there. I removed the resistor thinking maybe something might have gone wrong with it, but even after removing the resistor, my voltage readout still shows a constant 13.6v (still using the Li-ion batteries). Any thoughts would be greatly appreciated. If pictures are needed I can make some. Thanks.