Date   
Re: The issues of the TDA2822

Tom Christian
 

I have to agree that Farhan & company are doing a fantastic job!  Amazing rig at an incredible price!  Kudos also to the exceptional support community!  Better customer service than I've had with some world-wide short-named computer companies!  I had one of the bad WX chips and received great direction & help from this group in getting it fixed.  I look forward to more adventures going forward.  Thanks Farhan! Thanks all!
Tom
AB7WT

Re: uBITX Software error messages #ubitx-help

DJ2AG
 

Ingvar, even when the IDE opens all 9 files, it knows how to compile and link together all of them (including libraries) if you  choose compile sketch. 

So If there are still errors, please post the error messages. Maybe some library problem. But the error messages will show ( more or less directly 😉 ) what’s wrong.

Armin, DJ2AG

Re: The issues of the TDA2822

Rob Snow
 

I agree, Tom.  I have to admit that I'm excited to see what 2822 my uBITX that shipped today has, WX or other.  I'm not even worried if it is bad or blows up...I may even secretly be hoping for a reason to do some radio surgery.  I've said this before, lots of support for Farhan & co for this already wonderful adventure. 

Now, back to laying out my SMD tests that came in after I discovered them on this list...I bought 2 of the easy and 2 of the medium difficulty, man 0402 is *tiny*.

Re: Micro BitX No Audio TDA2822?

Sajid Rahum
 

Hi David

Same question also, I received ubitx today and it has the same faulty ic.  2073D - is it a straight replacement for TDA2822?

Sajid

TDA2822 Audio problem #ubitx #tda2822

Jason Schlager
 

Assembled my ubitx last week and after a demonstration last night in front of some boy scouts one of the parents complained of a loud tone coming from the speaker.  So I busted out my cell phone and fired up the Spectroid app mentioned in another post.  There is definitely a 9khz tone coming out of the speaker.  Its does change intensity when changing volume but it is a good 3 times the volume of all other audio coming out of the speaker. I have the MX TDA2822 chip. I rerouted the wires going to the volume control pot and to speaker without any positive changes. Any suggestions on how to clear this up or just swap the chip or build an alternate audio amp circuit or filter it out?  Just looking for some recommendations on how to attack this problem.

Jason Schlager
KM6AUS

Re: Complaint Department

Vince Vielhaber
 

If there's going to be a link to errata, it could be a link to the wiki page on errata. Doesn't have to be one pointing to the first page of it making anyone dig around for anything. For all that matter, a link on the first page of the wiki to errata would help as well for someone who just went straight there.

Vince.

On 03/13/2018 11:21 AM, Jerry Gaffke via Groups.Io wrote:
When the box arrives, most new owners will find their way to
http://www.hfsignals.com/index.php/ubitx-wire-up/
and string it up. Then put on their safety goggles and power it on.
Hard to imagine 4000 new owners all digging around in the wiki for
wire-up errata.

A pointer at the top of the wire-up on hfsignals to a curated
errata/addendum webpage
would allow Farhan to move on to other projects and ignore necessary
edits.
A good example of where this was needed would be the TDA2822 WX blowup,
the latest news was changing daily.

Jerry



On Tue, Mar 13, 2018 at 07:25 am, Vince Vielhaber wrote:

On 03/12/2018 12:54 PM, Jerry Gaffke via Groups.Io wrote:

Perhaps a link into a page on ubitx.net, if ZL1AXG is willing to
curate it.
Start with essential changes at the top, as hacks become less
essential state why you might want to do them.

Jerry, KE7ER

Shouldn't the wiki be used for this?

Vince.

TDA2228M

ae1ct1998 <AE1CT1998@...>
 

I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT

Re: Micro BitX No Audio TDA2822?

Jerry Gaffke
 

I assume your uBitx arrived with the bad WX TDA2822 part. 

This part:  https://www.mouser.com/ds/2/294/NJM2073_E-275459.pdf
should be a direct pin-for-pin replacement of the TDA2822.
Mouser part number is  513-NJM2073D, costs about $1, plus another $5 for shipping .
Mouser is a top line distributor, there are other vendors.
JRC strikes me as a very reputable manufacturer.

An alternative is this from Tayda at $0.29:
  https://www.taydaelectronics.com/tda2822-audio-amplifier-1-channel-mono-headphones-2-channel-class-ab-1wx1at32-ohm-1-8v-15v-pdip-8.html
I think we heard from somebody in the group that this worked well for them.
UTC is not a company I am familiar with, and Tayda goes for the budget end of the market.
I like that UTC has cooked up what looks like a complete datasheet, not just a photocopy of the ST datasheet.

Many other possibilities out there, just two that look good to me.
I have not tried either one.

Jerry, KE7ER 


On Tue, Mar 13, 2018 at 10:27 am, Sajid Rahum wrote:
Same question also, I received ubitx today and it has the same faulty ic.  2073D - is it a straight replacement for TDA2822?

Re: TDA2228M

Dale Brooks KG7SSB <kg7ssb@...>
 

Try this one, I think it prints a fairly clear drawing.
Dale Kg7ssb

On Tue, Mar 13, 2018 at 10:57 AM, ae1ct1998 <AE1CT1998@...> wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT


Re: Complaint Department

Jerry Gaffke
 

Could be to the wiki.
But if so, then all 10000 members of this forum could be editing it.

I think a curated errata page on ubitx.net would be preferable for new builders.
But by all means, we can have a wiki errata page, where we all pile in with our own perhaps conflicting suggestions.

Jerry


On Tue, Mar 13, 2018 at 10:42 am, Vince Vielhaber wrote:
If there's going to be a link to errata, it could be a link to the wiki page on errata. Doesn't have to be one pointing to the first page of it making anyone dig around for anything. For all that matter, a link on the first page of the wiki to errata would help as well for someone who just went straight there.

Shipped, me too

John Scott
 

Finally got the notice that my uBITX has been shipped to India Post.  Ordered it 1/20/18 and received notice 3/13/18.  It would appear that they are catching up a little as I expected about a 45+ day turn around.  Thanks for all the posts, now I will have to try to figure out which ones apply to my unit ;-)
John
KK5VH

Re: TDA2228M

Dale Brooks KG7SSB <kg7ssb@...>
 

Sorry about that I thought you were asking for the BITX40 schematic. I don't have a copy of the ubitx.
Dale

On Tue, Mar 13, 2018 at 11:12 AM, Dale Brooks <kg7ssb@...> wrote:
Try this one, I think it prints a fairly clear drawing.
Dale Kg7ssb

On Tue, Mar 13, 2018 at 10:57 AM, ae1ct1998 <AE1CT1998@...> wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT



Re: The issues of the TDA2822

Rahul Srivastava
 

Hi!

Farhan already knows this story of mine regarding 2822's. Recently I made a simple  low noise receiver. Seeing the specs and after a nice discussion with Farhan I used this chip. Bought 10 pcs of them ie 5 each from 2 different shops locally, read as typical far east device manufacturer unheard of.

2 created virtual short and the holy smoke, 2 of them had lot of hiss, 1 was very peaceful silent , dead silence, rest of them had low gain AF level whatever. I had an old original St chip about 10 years old in my junk box I installed it and everything became fine..

Moral of the story :  Lot of sub standard stuff is out there these days.

73

Rahul VU3WJM

Re: TDA2228M

w7hd.rh <w7hd.rh@...>
 

Did you mean TDA2822M?   That is in the ubitx transceiver (80-10M).  The bitx40 is a totally different radio, but isn't called a microbitx. 

If you mean the ubitx transceiver, you can find help here: 

    http://ubitx.net/

and original documentation here:

    http://www.hfsignals.com/

with a good schematic and individual areas explained here:

    http://www.hfsignals.com/index.php/ubitx-circuit-description/

and the fix for the audio getting blown, see the attached PDF.

Ron W7HD

On 03/13/2018 11:12 AM, Dale Brooks KG7SSB wrote:
Try this one, I think it prints a fairly clear drawing.
Dale Kg7ssb

On Tue, Mar 13, 2018 at 10:57 AM, ae1ct1998 <AE1CT1998@...> wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT


-- 
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter

Re: TDA2822 Audio problem #ubitx #tda2822

Jerry Gaffke
 

Here's an old thread on it:
    https://groups.io/g/BITX20/message/40038

Here's a summary:

The uBitx 11.9965mhz BFO can have harmonics that can beat with harmonics of the 16mhz oscillator
on the Raduino.  There's also a 12mhz oscillator on the Raduino for the USB port to the host that
may be causing trouble.  Those with this issue have found that swapping to a new Nano seemed to cure it.
In your case, you could instead add a low pass audio filter in there somewhere.

The Nano's use a resonator, not a quartz crystal, something like this:
    https://www.mouser.com/ds/2/281/p16e-522700.pdf
Can be some variation between Nano's.

Ideally, we would either move the 12mhz IF to some other frequency,
or build a custom Nano/Raduino that does not have 16mhz and 12mhz oscillators.

The work-around for now is to keep the BFO below the 12mhz filter,
swapping sidebands by moving the second local oscillator (clk1) between
high side and low side.  This works fine on most rigs.

Jerry
 

On Tue, Mar 13, 2018 at 10:31 am, Jason Schlager wrote:
Assembled my ubitx last week and after a demonstration last night in front of some boy scouts one of the parents complained of a loud tone coming from the speaker.  So I busted out my cell phone and fired up the Spectroid app mentioned in another post.  There is definitely a 9khz tone coming out of the speaker.  Its does change intensity when changing volume but it is a good 3 times the volume of all other audio coming out of the speaker. I have the MX TDA2822 chip. I rerouted the wires going to the volume control pot and to speaker without any positive changes. Any suggestions on how to clear this up or just swap the chip or build an alternate audio amp circuit or filter it out?  Just looking for some recommendations on how to attack this problem.

Jason Schlager
KM6AUS

Re: Micro BitX No Audio TDA2822?

ae1ct1998 <AE1CT1998@...>
 

I WAS GIVEN A MICROBITX WITH A BLOWN UP TDA2228M CHIP, I REAPLACED IT AND NOW THE AUDIO IS VERY LOW. IS THERE ANYPLACE ELSE THAT I SHOULD BE LOOKING TO FIND OUT WHY I HAVE LOW AUDIO? ALSO THERE IS A HISS AND NO MID OR LOW RANGE JUST HIGHS, IVE USED HEADPHONES AND A SPEAKER WITH NO RESULTS. ANY HELP WOULD BE GREATLY APRECIATED.

GARY
AE1CT

Re: TDA2228M

Jerry Gaffke
 

Here's a schematic:  http://www.hfsignals.com/wp-content/uploads/2017/12/ubitxr3.png

You might try adjusting the BFO within the menus.
See step 3, "Setting the BFO":  http://www.hfsignals.com/index.php/ubitx-tuneup/

The VFO does not track while moving the BFO, so any incoming station quickly becomes unintelligible.
So set the BFO for lower frequencies, then leave the menu (by hitting ptt) and retune.


On Tue, Mar 13, 2018 at 10:57 am, ae1ct1998 wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT

Re: TDA2228M

Arv Evans
 

Scroll to the bottom for the uBITX schematic.

_._

On Tue, Mar 13, 2018 at 11:57 AM, ae1ct1998 <AE1CT1998@...> wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT


Re: TDA2228M

Mike Woods
 

Did you adjust the BFO?  They come way off frequency with audio as you describe.  Press the rotary encoder button and select Settings.  Press again when display reverts l and select BFO calibrate in the menu.

Mike


On Wed, 14 Mar 2018 at 6:57 AM, ae1ct1998 <AE1CT1998@...> wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT

Carl's case

Tom Clarke
 

I just received one of Carl's nifty cases for my ubitx. In addition to speedy service, the case is a winner! Everything fit like it was made for it! Oh, wait, it is made for it.
This is an elegant way to finish off your micro. Get one, you'll be glad you did.
73 de Tom/W4OKW


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