20-03-2018, 23:00
Hello,
I have a question concerning the capacitors on the TX 3.12 board.
C3: Is there any reason why this capacitor is chosen so big? Neither the 7809 requires such a big output capacitance nor the AMS1117 such a input capacitance.
Another problem is I can't get such a big capacitor with a 2,54mm grid. So if there is no specific reason which I don't see at the moment? If not I would use 100µF for C3. This should be sufficient.
I noticed if you power the TX board without a battery but with a non stabilized power supply it could be necerssary to add an additional capacitor on the input of the 7809 voltage regulator.
I have a question concerning the capacitors on the TX 3.12 board.
C3: Is there any reason why this capacitor is chosen so big? Neither the 7809 requires such a big output capacitance nor the AMS1117 such a input capacitance.
Another problem is I can't get such a big capacitor with a 2,54mm grid. So if there is no specific reason which I don't see at the moment? If not I would use 100µF for C3. This should be sufficient.
I noticed if you power the TX board without a battery but with a non stabilized power supply it could be necerssary to add an additional capacitor on the input of the 7809 voltage regulator.