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Most of us find that the LM386 drives a speaker adequately,
though speakers, environment, and ears can all differ significantly.

I'd start by trying out other speakers, this can make an amazing difference in volume and sound quality.
Perhaps bring some small device such as a transistor radio into a second hand store,
try driving the bookshelf stereo speakers from the headphone jack, see what works best.
Maybe even bring your old speaker into the store with you to do an A/B test.
But of course, be sure to let clerk know what you have in your pockets as you enter.

Plan B would be to make use of a small sound system of some sort that has an AUX input jack.
If you don't happen to have one, that second hand store probably does.
This would be an excellent solution if you usually use headphones anyway.

Most of the audio amp breakout boards these days are Class D, which can be much more efficient.
Class D means it is switching at perhaps 100khz or more, this can create hash in your receiver
if the board is not properly filtered and shielded.
That may work, but it is safest to stick with an old-school analog amp.? Like the LM386.

Another consideration is that most small audio amps are designed to run from one or two batteries,
so a power supply of 5 volts or less.
Easiest to have an amp that runs directly off the same 12v as the uBitx.? Like the LM386.

That said, most of those 5v class D audio amps could probably be made to work without too much trouble.

Perhaps somebody else can recommend a good 12v analog audio amp.
The TDA2003 looks promising:?
With the feedback network shown, it should have about the same gain as our LM386.

Jerry, KE7ER

Try this link for the tft files:


I have not seen a difference in performance, and had problems finding a tft file for the enhanced.? I would go with what is available, though the enhanced may give more options if you want to modify the file.

73
Evan
AC9TU

hi

i built the uBitx v6 transceiver last summer, tested it? and then put it to one side while working on other projects, Now I have come back to it and expected it to work. Unfortunately when I connect power and switch on all i Get is a screen that flashes white, and does not display the default screen. I have searched this forum for any info that might help, but nothing AFAICT.

Anyone else seen this effect? Any guidance will be useful ...

Thanks!

Evan
The site uBitx.net does not show the 2.8" screen software? So you can use the basic Nextion?? and also the Enhanced would be better??
I do know the wiring for it I found it online.
Happy New Year
Evan

I didn’t unsubscribe from any group

I found that if i plugged in the USB cable into the uBITX before turning on the volume knob the interface worked. If i had the uBITX running and then plugged in the USB there were connection errors. Something to try.

Plenty has seem to be written about audio output on the different versions of the uBitx. I was wondering if anyone out there had done a review/writeup of the different after market audio amps that are available and how to wire them up?? My audio is about good enough for headphones but I need to be able to use a speaker.

Any advice on this one greatly appreciated.? Ian K3HQL

Alex

See Rafael's instruction. The bfo comes unadjusted and yours may be way off. The bfo is the oscillator for the final mixer in receive path. It must be precise to create the audio, as the difference between the signal passing through the sharp IF filter and the bfo determines the audio we hear.

Using your dvm you can check for open or short connection at the rf coax, also you can unplug speaker to use headphones.? but my guess it may be bfo.

Curt wb8yyy

Hi Alex

There is an “unsubscribe” link at the bottom of every email you receive.?
--
Karl Heinz - K5KHK

On Fri, Jan 1, 2021 at 06:36 PM, Gregg wrote:

Here is what I mean

Gregg,
The parts your a looking for are called "standoffs". Measure the standoff height and order new ones. The screws are M3.?
An example of a kit is?eBay item number:353263945615

?

I don't know if this kit has the correct height assortment.

Rgds,
Gary

Jon,
That depends on which Nextion you have purchased.? Also on what features you may want to add.? A good source is ubitx.net in the download section for larger screen sizes.? For the 2.8" Nextion that can be forced into the stock case you can try this location:


In the above are also the wiring instructions for the screen.

One last point, some of the screen programs were built using the older LTS Nextion editor, and will not fit into the 2.8" display using the newest Nextion editor.? You need to worry about this only if you want to make changes.? Just be sure to get the correct size and model (Basic or Enhanced) tft file that matches your display.? Be sure to load the screen files before you install the Nextion into the uBITX, as the default orientation puts the microSD card slot on the bottom (this can be changed if you take the source and modify it with the editor).? All you need is a 5volt supply to power the Nextion screen.? Some of the screens come with a microUSB power tap that can be used for the setup.

Have fun and Happy New Year!
73
Evan
AC9TU

Evan
One other thing you said about having the correct program for the Nextion? where does that come from??

Evan
I do not have the Nextion yet, but it is on order. You answered what I wanted to know you cannot use the stock uBitx screen. I thought that!
As for the Xloader, and as you say it is just my Firefox that is trying to stop it.
Thanks for the information, that helps a lot. I am to old for this (87), but I like playing!
Happy New Year stay safe.

Jon/KD3GZ

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Paul mGauci

On Fri, Jan 1, 2021 at 02:32 PM, Jon wrote:

I am looking for someone to tell how to put this firmware into the Arduino IDE? I have not unzipped it yet....
I have followed KD8CEC this, far and do I need Xloader to do it? or how? I tried to download Xloader and it said it was a bad site to go to?
Could I use Balena Etcher?

Jon,
Before you try to flash the KD8CEC firmware, do you have the Nextion screen and the correct program for it?? The KD8CEC firmware will not work with the stock uBITX screen.

Since Xloader is free, the author did not register the program with Microsoft or any other program verification site.? As such it will trip the warning when you go to download it.? I have bypassed the warning and not had issues.? I cannot vouch for the site that you are using but would think that it is OK.

If you do not want to trust the Xloader site/program, then you have two options:
1 - download the source code, set the correct #defines in the ubitx.h tab in the Arduino IDE.? The zip file contains only hex files that need a hex loader.? Balena Etcher would not work as far as I know.
or
2 - follow the instructions in this link to use the Arduino uploader without compiling the source:



To make sure all know how to help you, can you tell us what you want to accomplish by switching to the KD8CEC firmware??

73
Evan
AC9TU