开云体育

I'm thinking of putting a small class D audio amp and tiny speaker/s in my build when I get that far (along with battery/charger and possibly ATU)
It looks as though I can pick the audio up from JP301 pins 3&4 which are labelled as switched so hopefully are the connections that get broken away when an audio jack is inserted into the earphone socket. Can anyone confirm that thats correct?

Thanks
Steve

Completed my build and tested - JP301 pins 3&4 do exacly what I need for an internal amp and speakers.Now just waiting for my little speakers to arrive.
Decided against internal ATU, but have my internal battery working a treat, with 12V OR USB charging (from a separate USB-C socket).
Pretty happy so far!

Will do....? My plan is to use one of

I'll cut holes in the top of the box and print a grille something like this:



I'll pick up L+R feeds from the extensions to JP301 that I've extended to the dev board with headers.

Power will come from the output of my internal battery/ext 12v changeover relay.

I'll update when I have the parts and get it running!

My battery system uses 3 x 18650 with a USB-C charge board and BMS. I'll scribble a drawing of what I've done when I get a moment.

This is a quick scribble of the power:


These are the parts I used:

12-5 Buck
3S charger ?https://epartners.co.nz/products/jo8001
BMS https://epartners.co.nz/products/st4001-1?_pos=1&_sid=770963d6a&_ss=r
12-12 converter
Relay

It's not the most efficient way to do it, but gives the flexibility to charge from 12v or USB-C - and I had these boards all in the shack!

...and the 12-12 on the feed to the radio means I can supply pretty much any DC on the input and not worry about not going over 12v.? I don't yet know how noisy it is, but I can always remove it if so.

Steve, I’m working on the speaker idea also.
Have you found any issue with the speaker’s magnetic fields interfering with the toroids directly below?
I’m doing a half height implementation so if you have issues mine would be worse with the speakers sitting directly on the dev board just 5mm above the toroids.
I’ll probably run through all the tests for each band with and without the speakers just to see what it looks like.
--
Randy, N4OPI

Randy, I don't know if it would be significant, but did you consider magnetic shielding? A steel jar lid might work.?
--
73, Dan? NM3A

Thanks for your reply Dan. I had considered shielding but before doing that I decided to take the time to run all of the diagnostic sweeps on all bands with and without the speakers sitting on the Dev board and I'm happy to report that the speakers make absolutely no difference in the sweep results.
So on with the show.
--
Randy, N4OPI

Good stuff, Randy!
Those toroids really are self shielding!
--
73, Dan? NM3A