开云体育

Hi,
just after assembling I had the following symtom, after a vacation it worked for two days and now I have
the symtom again:

If I use a variable powersource my uBITX v5 (at least the Radiuno) works up to a voltage of 5-6V.
After that the display freezes (Pic1).

If powering on at higher voltages like 13,8V I get the following (Pic2):


Anyone knowing whats going on here?

Thanks in advance!

73
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Michael (DD4MR)

There is a brightness adjustment pot on back of raduino...Blue box with white dial. Try that. Also...I would keep the voltage to the rig at 12v. Raduino should only see 5v. 13.8v to the rig?starts damaging parts, if you're not careful.

It is not clear from you initial message where you are applying the 5-6 volts and the 13.8 volts.? If both are at the normal 12vdc input to the rig, then the Raduino voltage regulator is shorted.? Need to correct the short, or replace the 7805 regulator.? You have also probably toasted the Nano if you varied the voltage at the input to the rig.

To check if the Raduino is OK, I would first try disconnecting the Raduino and powering from a PC or other 5vdc USB source through the Nano miniUSB connector on the Nano and verify that the Raduino works.? If it does not, then you will need to verify if the Nano is still OK.

I would verify that you do have 5vdc on the Nano (?when connected to the USB power source.? If not, then take the Nano out of the Raduino (it is socketed).? Check again for the 5vdc on the Nano.? If not there, Then the Nano is toast, and you need to find out if the voltage regulator in the Raduino shorted and took out the Nano.

The above assumes that you were applying power to the power input to the rig.? If not, then we need more information to help resolve the issue.? Pictures of the Raduino mounted in the uBitx to show the wiring would be helpful, as there may be a wiring error.

Please use your own judgement when using the above.? I have done the tests without issue, however your experience may be different.? There may be better ways to isolate the problem.

73
Evan
AC9TU

Hi,
thanks all for responding,
Im not shure, most probably it is the brightnes adjustment.
If adjusting the brightness I can produce the symptom on Pic2.
Currently it works again.

To answer some of the questions:
I applied the 12-13.8V to P1 (brown and red wire).
The Arduino-nano gets 5V.
The Arduino-nano works on USB



So is it advisable to max the voltage for the raduino (The red wire on P1) to 12V?

Thanks!

Zitat von Sam Tedesco <stedesco619@...>:

There is a brightness adjustment pot on back of raduino...Blue box with white dial. Try that. Also...I would keep the voltage to the rig at 12v. Raduino should only see 5v. 13.8 starts damaging parts, if you're not careful.

73
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Michael (DD4MR)
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73
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Michael (DD4MR)

I would recommend 12v. I have seem damage at 13.8.

If you are using a standard 13.8 vdc power supply, then I would recommend either a drop down regulator, or two diodes in series from the 13.8 vdc to the red wire, and direct connect the brown wire to the 13.8 vdc.? This gives the finals all the power that you have, and protects the rest of the rig from the 13.8vdc.? I also fuse each separately, with reverse voltage protection on the finals (the forward biased diodes protect the main board).

Above are my thoughts, yours may vary..
73
Evan
AC9TU