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Hi Shirley, I'm afraid that part is already long lead-time also so not much help. I already checked that a while ago.

QFN-44 seems to still be available as you suggest.? Like you say, a relatively minor pcb re-design but for those who have the current pcb and near finished, only a very last resort.

glenn

Hi David,
?I had already ordered from Farnell a while back but delivery was long way away.?? The other PIC16F1454 I already have and fitted to my board.

I found the demo board you mentioned "MICROCHIP DM164142" AND ORDERED IT.?? Thanks for the tip.

Glenn

Hi Glenn

Hi All, just wondering if anybody else has an ATU-10 PCB and has started assembling it?

More to the point though, actually trying to buy some components, ie semiconductors

I'm specifically try to buy the PIC16F18877-E/MV? (or the I/MV)??? All places I find have them for delivery next year, at least 6-10mths away. Anybody found some in stock? And where?

Similar for the PIC16F1454-I/ML and also the 3v3 regulator in SOT-23 package.? 'Unobtainium' it seems.

I'm essentially just waiting for the PIC16F18877 device to complete my build.

Glenn

Thanks David

Since the TP4056 is listed on the BOM, wouldn't it be better to also include the 2 x 10uF caps on the BOM also?

With a note to say they are removed from the board.? Some people may buy the TP4056 in chip form, not on a module.

Glenn

Brock - I can send you some T68-2 toroids at cost. I got them directly from Diz aka The Toroid King. My only ask would be if you would send me one of your toroids for testing.

I have measured some ebay T38-2 toroids that have a Q < 10 across the HF spectrum...

I have made changes in BOM.
2 x 10uF caps and 2 Amp fuse are taken from charger board which is listed.

There is a video with the time code?

Hi, Glenn

Thanks, Brock. I hadn't considered the core material being a problem. I ordered another kit for a remote tuner, so I'll get a set of reputable toroids to see if it makes a difference. I can measure them (I think) with my Proster BM4070 meter. I'm not sure it would detect heat-related breakdown, however. Should I expect this tuner to go toe-to-toe with my KX3's built-in tuner? I only rarely find something it can't match and I hope this one will do the same.

Thanks David, that's corrected, plus a few missing caps added etc on this drawing. Attached.

On your BOM though I have found a few errors.

• 10nF cap shown as 45pcs, should be 58
• 0.1uF cap shown as 4pcs should be 9
• 10uF cap is not listed, should be 2 pcs.
• 10k ohm shown as 3pcs should be 5
• 1k ohm shown as 2pcs should be 4.
• delete '5k1' ohm and add '2k6' (i used 2k7)

I programmed up the PIC16F1454 using PicKit4 and IPE X V5.45.? Initially I had problems of the programmer finding the device,? until I connected the Vcc pin of the ICSP to 3v3.

I don't yet have the PIC16F18877 but what is the method used to program this device?? DfuSe perhaps ?

Glenn
vk3pe

Hi Steve,

The more I ponder the board I've put together and its flakey performance, the more I suspect that the quality of the parts is extremely variable from batch to batch.? You've noted the diodes.? In my case, I'm questioning the quality of the cores as well.? I have no doubt that the design is sound and I have no doubt that the programming is sound.? But my trust and faith in the inexpensive board from overseas?...Extremely low.? I'm guessing that watching SWR climb in front of my eyes with the key down is a good indicator of a crap ferrite.? 5 watts?? Give me a break - they must be a mixture of sawdust and machine shop floor sweeping held together with Elmer's Glue.

I've seen no suggestions beyond yours as to how to sort my tuner, so I'm interested to see what people have to say about your toroids and capacitors question.? I'm beginning to accept that this was money burned to occupy some evenings playing with a soldering iron.? Unless there's a reasonably obvious solution to my situation, I don't see much point in replacing all the parts one by one in trial and error.? I'd be better off buying a bare board and learning how to do surface mount work with reputable parts... right from the beginning.

Brock VA7AV

Hi all, I just finished a build from an Ali Express seller. It seemed to work good, but wouldn’t always find a match and never showed less than 1.17:1 SWR. I saw a post on the GitHub site regarding the RF diodes. It appears many of the Chinese boards came with poorly selected diodes, allowing capacitance across the junction. Or something. I’m not an EE…

I ordered a handful of 1N5711 Shottkys from Mouser. They arrived today, so I immediately swapped them out. I removed the SMDs and replaced them with traditional through-hole devices. Sure enough, the SWR gets down to 1.04:1, which is close enough for me. The wattage appears to be more accurate as well.?

I have found that the tuner works great, most of the time. I have an 80M end-fed, and tried several hands. It would not match 160M. My Elecraft radios will match it, as will my MFJ-993b. Granted, I’m not getting out great, but it does find a match. On 80M, I reached higher into the band and it could not match a 3:1 SWR. Even my 7300 can match that. Otherwise it seems to match everything from 40M to 6M.?

Can anyone enlighten me on checking the toroids and capacitors? Does the power-on troubleshooting screen show the expected values or the measured values? Would it indicate whether the device was open or shorted??

I like this project a lot. I’m learning a ton and hope someone can teach me more. Thanks!

HI. Looks good.
One of common anode LEDs, close to protecting BAT54S does not connected to the battery voltage.

Since David says he has no Schematic available for the ATU-10, I have traced much of the circuit and drawn my own Schematic, while waiting for several parts to arrive, on long lead times..

This is NOT an official Schematic and no doubt contains many errors and omissions.?? It's more to give an idea on how it works than anything.

?? Repeat, NOT an official or even accurate Schematic. Use with caution !

Glenn
vk3pe

Thanks David

maybe you can delete it from the BOM and add the 2k6. (Actually 2k7 would be preferred for availability)

I'm getting close with assembly but on hold waiting for several parts as you can see.

Glenn

Hi Glenn.
I have deleted this resistor from last version of board. Thanks for the notice.

Thanks David

Can you also clarify the 5k1 ohm resistor called up on the BOM.?? There is no marked 5k1 on the PCB.

I assume perhaps it's for the Rset of the TP4056 charger chip?? This is marked on the PCB as 2k6 which equates to a charging current of about 460mA.
Maybe you have changed this resistor to 5k1 for a charge current of about 250mA ???? (or maybe paralleled up 2 x 5k1 for approx 2k6 ??)

Glenn
vk3pe

Hi, Mark
I don't remember exactly, 12W is the maximum power could be operated by microprocessor.
If you want to use 50W and more try this tuner?


I will not do kits for this tuner. I am not agaist If chinese?manufacturers will sell such kits.