Alright,
I need some professional help here. I am currently modifying a Hubsan "FPV Transmitter" (an RC controller that transmits commands on 2.4ghz and has an color LCD display that shows a live video feed from the helicopter...the video is received on 5.8ghz) to accept a large capacity 3s LiPo battery in place of the original 4-AA arrangement. I am doing this to increase operating times between charges.
What my intention is to do is to install the 3 cell LiPo Tx pack, the one from Turnigy designed for the 9XR transmitter, fed into a BEC (Battery Eliminator Circuit = DC-DC converter) that is rated for 6volts/3amps output.
Here is where things went south. I, in my foolish carelessness, hooked up the BEC backwards with regards to input and output. I did not notice this until I attached the battery and was not getting any signs of life from the Transmitter. I measured the voltage coming out of the BEC only to find 39 volts coming out. As well, the BEC was getting warm quickly. I disconnected the battery, and realized what I had done.
I swapped the BEC around and tested it for proper output before turning the Tx on again. The BEC, fortunately, was still putting out a steady 6 volts and was not heating up anymore. But now I have two new problems!
When I turn on the Transmitter power switch, the LCD display never shows signs of life. And, there's a little surface mount module directly after the power switch that gets extremely hot in just a few seconds. I have included a few pics of the device below. I'm guessing it's a linear voltage regulator. The label on the part is "0B21." I can't find anything about this module online. The component in question is the little module mounted between the two push button switches, just below the main power switch. If it is, in fact, a linear regulator, I am quite surprised that it does not have a heat sink installed from factory.
So now I'm wondering if I jacked up my Tx or not. What do you guys think?
1) What is that component and why is it getting so hot when I'm feeding in the same voltage as the 4-AA batteries would have? Unfortunately, I do not know if it got so smoking hot when the 4 AA batteries were connected. Did I damage the regulator via over voltage input and now it's ruined?
2) What may have burned out that might keep the LCD display from working?
Thanks in advance for all your help!
Jon
I need some professional help here. I am currently modifying a Hubsan "FPV Transmitter" (an RC controller that transmits commands on 2.4ghz and has an color LCD display that shows a live video feed from the helicopter...the video is received on 5.8ghz) to accept a large capacity 3s LiPo battery in place of the original 4-AA arrangement. I am doing this to increase operating times between charges.
What my intention is to do is to install the 3 cell LiPo Tx pack, the one from Turnigy designed for the 9XR transmitter, fed into a BEC (Battery Eliminator Circuit = DC-DC converter) that is rated for 6volts/3amps output.
Here is where things went south. I, in my foolish carelessness, hooked up the BEC backwards with regards to input and output. I did not notice this until I attached the battery and was not getting any signs of life from the Transmitter. I measured the voltage coming out of the BEC only to find 39 volts coming out. As well, the BEC was getting warm quickly. I disconnected the battery, and realized what I had done.
I swapped the BEC around and tested it for proper output before turning the Tx on again. The BEC, fortunately, was still putting out a steady 6 volts and was not heating up anymore. But now I have two new problems!
When I turn on the Transmitter power switch, the LCD display never shows signs of life. And, there's a little surface mount module directly after the power switch that gets extremely hot in just a few seconds. I have included a few pics of the device below. I'm guessing it's a linear voltage regulator. The label on the part is "0B21." I can't find anything about this module online. The component in question is the little module mounted between the two push button switches, just below the main power switch. If it is, in fact, a linear regulator, I am quite surprised that it does not have a heat sink installed from factory.
So now I'm wondering if I jacked up my Tx or not. What do you guys think?
1) What is that component and why is it getting so hot when I'm feeding in the same voltage as the 4-AA batteries would have? Unfortunately, I do not know if it got so smoking hot when the 4 AA batteries were connected. Did I damage the regulator via over voltage input and now it's ruined?
2) What may have burned out that might keep the LCD display from working?
Thanks in advance for all your help!
Jon