Wim, would be good to see some photos of your implementation to try and figure why you are having these issues. Cheers
looks like some batches of those MAX3232 boards do have issues, I have 10 of them that would work, get very hot and eventually burn.
I have found references https://electronics.stackexchange.com/questions/122769/max3232-overheating-burnt-after-connecting-to-pc of similar problems and all ultimately point to defective chips, I guess it’s just a matter of luck
I just got a batch of 10 and sent one to Wim. I need to test these I guess! Thanks for the heads up Alex.
I found out the same. If I connect the PC to the FC the 3232 get,s very hot. No PC connection via USB no problems, all is working and stays cool.
These are really a lottery to get good chips. I’m sorry for all the hassle
I also think its a lotery😜
I can try to make a photo, but the only one I have left is the one from Paul the rest is gone…
The only setup that is working good is with the 2 transistors and 3 resistors. Than I have a super transmitter Thanks to Yaapu
you’re very welcome
I’am going to make cable to connect kakute f7 aio v2 and frsky r-xsr.
I have a few questions:
R-XSR have only one pin for smart port ( no separate GND and VCC pin) So it should be only one wire between max3232 and r-xsr ?
On kakute I have 3.3v output (200 mA max) is it enought ?
Do I have to solder any resistor , diode or capacitor ?
Thx in adavnce
Sorry, but have no experience with that setup, both the kakute or the r-xsr, so can’t be of assistance.
An update on my personal “lottery” with the max3232 ICs, I bought 10 genuine TI MAX3232ECDR SOIC-16-N chips and swapped the defective ones I originally had on the boards and now everything works as expected.
The new ICs are cool to the touch even at 5.5V…
The genuine parts are around 2$ each so overall still a very cheap and (now) reliable solution