26-04-2017, 14:50
I did a test with TFT backlight off last night before I had to call it a day.
Your suggestion is right: with the backlight off the 3.3V regulator runs slightly warm, not hot. In fact, when I push the push button to turn off the backlight, while holding a finger on the regulator, I can actually feel it immediately starting to cool down.
Planned next steps:
- I've ordered a step-down buck converter, as I'd like to run the RX+ off a common 12V supply (I've got a spare from old network router etc.) and it's convenient to be able to run off a 12V lead acid battery.
- Try with a better 12V supply (through 7809 to the RX+ at 9V). I've been using a cheap switched-mode 12V supply that's rated at 1.5A, but appears to be low quality.
What current draw is expected at 9V for the Pro2+ RX, with backlight on?
Your suggestion is right: with the backlight off the 3.3V regulator runs slightly warm, not hot. In fact, when I push the push button to turn off the backlight, while holding a finger on the regulator, I can actually feel it immediately starting to cool down.
Planned next steps:
- I've ordered a step-down buck converter, as I'd like to run the RX+ off a common 12V supply (I've got a spare from old network router etc.) and it's convenient to be able to run off a 12V lead acid battery.
- Try with a better 12V supply (through 7809 to the RX+ at 9V). I've been using a cheap switched-mode 12V supply that's rated at 1.5A, but appears to be low quality.
What current draw is expected at 9V for the Pro2+ RX, with backlight on?