Re: Pocket Tutor - hardware update
Hello Ken
If you are having trouble compiling, there are a few places to look: a) the STM32 "toolchain". b) the libraries. c) the board settings.
For a), I've had the best luck with the toolchain at , as described at the beginning of this video:
The official STM32 toolchain works, but the display speed suffers horribly.
The libraries I use are from Adafruit.? ?If you get an error related to one of the libraries, it could be an incompatible version. I am using recent versions.? Probably not the most recent.? I will get you version numbers if this proves to be the problem.
Double-check your board settings & make sure they correspond to what I list in the builder's guide.
Did you try compiling your way through the software tutorials, which start at??? ?If you can't find?any issue with your settings, go sequentially through the software tutorials (which start with blink) and see where the compiler error pops up.? That should help you narrow down where the problem lies.
You can avoid the Arduino IDE and compiler altogether by flashing your chip with the binaries.? ?I really like ST-LINK. One word of advice: make sure you power your device before connecting a ST-LINK clone.? And disconnect the dongle before you switch off your device.? If you don't, the device will consume current from ST-LINK and eventually burn out its tiny 3.3V power regulator.? I burned out a few before I figured out the problem.
Bruce
On Sat, Jul 18, 2020 at 10:27 PM Ken Kaplan < wb2art@...> wrote: Okay,? I'll review this when I get to the build. I will go over the parts list tomorrow.? Probably build at least 2 units. Got my st- link today. Have yet to try it. I did have some trouble compiling the ino a few days ago. I could compile a simple blink program for the stm32,? but try your software,? it said I could not compile for the stm32.? I have tried this on 2 different computers, and got the same result. I most likely have some thing set wrong ?I'll look into it in the next few days. Ken
On Sat, Jul 18, 2020, 6:29 PM Bruce Hall < bhall66@...> wrote: Ken,
Excellent!? I hope you enjoy your build as much as I did.
One last thing:? I've been using headphones a lot with my Pocket Tutor.? ?If you intend to use headphones too, you will?notice that output from the external speaker jack can be overwhelming.? (It creates room-filling sound with a 2W speaker.)? ?Will you get to the audio circuit, there are a few options to consider:
a) Use the circuit as is, and keep the volume control near zero.? ?It works, but you can do better.??
b)? Increase R13 to a larger value? (Easy fix, but reduces the range of the on-board speaker); or
c)? Add a series resistor between the amplifier circuit and the S-pin (sleeve) of the speaker jack.? This is mechanically trickier to do, but will be more satisfying.? I suggest a value of around 150-330 ohms.? With my headphones, 150 ohms is about right.
d) Make a short adapter cable with a series resistor in it.? ?Easy but clunky.
Bruce
On Sat, Jul 18, 2020 at 5:28 PM Ken Kaplan < wb2art@...> wrote: Yes, I just printed the shared cart. Will take some time and see if I need to adjust anything. Ordered the boards from jclpcb.? Ken
On Sat, Jul 18, 2020, 5:18 PM Bruce Hall < bhall66@...> wrote: Ken,
I put a shared cart on the builder's guide, which will create a single DigiKey order for most of the parts.? ? When I order I get lots of extras, so please review and adjust the?quantities of each item you?want.? Of course, if you prefer Mouser or another distributor, you will need to order them separately.
Bruce
On Sat, Jul 18, 2020 at 5:04 PM Ken Kaplan < wb2art@...> wrote: Thanks for the hints. I'm going to get boards and parts ordered, probably tomorrow. 73 Ken WB2ART?
On Sat, Jul 18, 2020, 4:59 PM Bruce Hall < bhall66@...> wrote: I have a few tips for anyone building the Pocket Tutor:
1.? The power supply needs a decoupling capacitor across the battery.? You should solder an additional 10uF cap across the pins of the battery jack J1.
2.? The audio and key jacks are recessed by about a millimeter.? Normally this isn't a problem, but one my plugs fails to make good contact.? ?So, when soldering these jacks, please situate them as close as possible to the board edge.? The extra-large soldering pads give you some leeway.
I updated the builder's guide to reflect these two changes.
Bruce
|
Hello Bruce
You did it again! Nice work with the portable tutor and the documentation. Top class!
I hope to get the new software implemented to my 'old' tutor, and need a hint for the display improvement. Can I find it in your Githup account?
BR OZ1QZ / John
|
Re: Pocket Tutor - hardware update
Okay,? I'll review this when I get to the build. I will go over the parts list tomorrow.? Probably build at least 2 units. Got my st- link today. Have yet to try it. I did have some trouble compiling the ino a few days ago. I could compile a simple blink program for the stm32,? but try your software,? it said I could not compile for the stm32.? I have tried this on 2 different computers, and got the same result. I most likely have some thing set wrong ?I'll look into it in the next few days. Ken
On Sat, Jul 18, 2020, 6:29 PM Bruce Hall < bhall66@...> wrote: Ken,
Excellent!? I hope you enjoy your build as much as I did.
One last thing:? I've been using headphones a lot with my Pocket Tutor.? ?If you intend to use headphones too, you will?notice that output from the external speaker jack can be overwhelming.? (It creates room-filling sound with a 2W speaker.)? ?Will you get to the audio circuit, there are a few options to consider:
a) Use the circuit as is, and keep the volume control near zero.? ?It works, but you can do better.??
b)? Increase R13 to a larger value? (Easy fix, but reduces the range of the on-board speaker); or
c)? Add a series resistor between the amplifier circuit and the S-pin (sleeve) of the speaker jack.? This is mechanically trickier to do, but will be more satisfying.? I suggest a value of around 150-330 ohms.? With my headphones, 150 ohms is about right.
d) Make a short adapter cable with a series resistor in it.? ?Easy but clunky.
Bruce
On Sat, Jul 18, 2020 at 5:28 PM Ken Kaplan < wb2art@...> wrote: Yes, I just printed the shared cart. Will take some time and see if I need to adjust anything. Ordered the boards from jclpcb.? Ken
On Sat, Jul 18, 2020, 5:18 PM Bruce Hall < bhall66@...> wrote: Ken,
I put a shared cart on the builder's guide, which will create a single DigiKey order for most of the parts.? ? When I order I get lots of extras, so please review and adjust the?quantities of each item you?want.? Of course, if you prefer Mouser or another distributor, you will need to order them separately.
Bruce
On Sat, Jul 18, 2020 at 5:04 PM Ken Kaplan < wb2art@...> wrote: Thanks for the hints. I'm going to get boards and parts ordered, probably tomorrow. 73 Ken WB2ART?
On Sat, Jul 18, 2020, 4:59 PM Bruce Hall < bhall66@...> wrote: I have a few tips for anyone building the Pocket Tutor:
1.? The power supply needs a decoupling capacitor across the battery.? You should solder an additional 10uF cap across the pins of the battery jack J1.
2.? The audio and key jacks are recessed by about a millimeter.? Normally this isn't a problem, but one my plugs fails to make good contact.? ?So, when soldering these jacks, please situate them as close as possible to the board edge.? The extra-large soldering pads give you some leeway.
I updated the builder's guide to reflect these two changes.
Bruce
|
Re: Pocket Tutor - hardware update
Ken,
Excellent!? I hope you enjoy your build as much as I did.
One last thing:? I've been using headphones a lot with my Pocket Tutor.? ?If you intend to use headphones too, you will?notice that output from the external speaker jack can be overwhelming.? (It creates room-filling sound with a 2W speaker.)? ?Will you get to the audio circuit, there are a few options to consider:
a) Use the circuit as is, and keep the volume control near zero.? ?It works, but you can do better.??
b)? Increase R13 to a larger value? (Easy fix, but reduces the range of the on-board speaker); or
c)? Add a series resistor between the amplifier circuit and the S-pin (sleeve) of the speaker jack.? This is mechanically trickier to do, but will be more satisfying.? I suggest a value of around 150-330 ohms.? With my headphones, 150 ohms is about right.
d) Make a short adapter cable with a series resistor in it.? ?Easy but clunky.
Bruce
On Sat, Jul 18, 2020 at 5:28 PM Ken Kaplan < wb2art@...> wrote: Yes, I just printed the shared cart. Will take some time and see if I need to adjust anything. Ordered the boards from jclpcb.? Ken
On Sat, Jul 18, 2020, 5:18 PM Bruce Hall < bhall66@...> wrote: Ken,
I put a shared cart on the builder's guide, which will create a single DigiKey order for most of the parts.? ? When I order I get lots of extras, so please review and adjust the?quantities of each item you?want.? Of course, if you prefer Mouser or another distributor, you will need to order them separately.
Bruce
On Sat, Jul 18, 2020 at 5:04 PM Ken Kaplan < wb2art@...> wrote: Thanks for the hints. I'm going to get boards and parts ordered, probably tomorrow. 73 Ken WB2ART?
On Sat, Jul 18, 2020, 4:59 PM Bruce Hall < bhall66@...> wrote: I have a few tips for anyone building the Pocket Tutor:
1.? The power supply needs a decoupling capacitor across the battery.? You should solder an additional 10uF cap across the pins of the battery jack J1.
2.? The audio and key jacks are recessed by about a millimeter.? Normally this isn't a problem, but one my plugs fails to make good contact.? ?So, when soldering these jacks, please situate them as close as possible to the board edge.? The extra-large soldering pads give you some leeway.
I updated the builder's guide to reflect these two changes.
Bruce
|
Re: Pocket Tutor - hardware update
Yes, I just printed the shared cart. Will take some time and see if I need to adjust anything. Ordered the boards from jclpcb.? Ken
On Sat, Jul 18, 2020, 5:18 PM Bruce Hall < bhall66@...> wrote: Ken,
I put a shared cart on the builder's guide, which will create a single DigiKey order for most of the parts.? ? When I order I get lots of extras, so please review and adjust the?quantities of each item you?want.? Of course, if you prefer Mouser or another distributor, you will need to order them separately.
Bruce
On Sat, Jul 18, 2020 at 5:04 PM Ken Kaplan < wb2art@...> wrote: Thanks for the hints. I'm going to get boards and parts ordered, probably tomorrow. 73 Ken WB2ART?
On Sat, Jul 18, 2020, 4:59 PM Bruce Hall < bhall66@...> wrote: I have a few tips for anyone building the Pocket Tutor:
1.? The power supply needs a decoupling capacitor across the battery.? You should solder an additional 10uF cap across the pins of the battery jack J1.
2.? The audio and key jacks are recessed by about a millimeter.? Normally this isn't a problem, but one my plugs fails to make good contact.? ?So, when soldering these jacks, please situate them as close as possible to the board edge.? The extra-large soldering pads give you some leeway.
I updated the builder's guide to reflect these two changes.
Bruce
|
Re: Pocket Tutor - hardware update
Ken,
I put a shared cart on the builder's guide, which will create a single DigiKey order for most of the parts.? ? When I order I get lots of extras, so please review and adjust the?quantities of each item you?want.? Of course, if you prefer Mouser or another distributor, you will need to order them separately.
Bruce
On Sat, Jul 18, 2020 at 5:04 PM Ken Kaplan < wb2art@...> wrote: Thanks for the hints. I'm going to get boards and parts ordered, probably tomorrow. 73 Ken WB2ART?
On Sat, Jul 18, 2020, 4:59 PM Bruce Hall < bhall66@...> wrote: I have a few tips for anyone building the Pocket Tutor:
1.? The power supply needs a decoupling capacitor across the battery.? You should solder an additional 10uF cap across the pins of the battery jack J1.
2.? The audio and key jacks are recessed by about a millimeter.? Normally this isn't a problem, but one my plugs fails to make good contact.? ?So, when soldering these jacks, please situate them as close as possible to the board edge.? The extra-large soldering pads give you some leeway.
I updated the builder's guide to reflect these two changes.
Bruce
|
Re: Pocket Tutor - hardware update
Thanks for the hints. I'm going to get boards and parts ordered, probably tomorrow. 73 Ken WB2ART?
On Sat, Jul 18, 2020, 4:59 PM Bruce Hall < bhall66@...> wrote: I have a few tips for anyone building the Pocket Tutor:
1.? The power supply needs a decoupling capacitor across the battery.? You should solder an additional 10uF cap across the pins of the battery jack J1.
2.? The audio and key jacks are recessed by about a millimeter.? Normally this isn't a problem, but one my plugs fails to make good contact.? ?So, when soldering these jacks, please situate them as close as possible to the board edge.? The extra-large soldering pads give you some leeway.
I updated the builder's guide to reflect these two changes.
Bruce
|
Pocket Tutor - hardware update
I have a few tips for anyone building the Pocket Tutor:
1.? The power supply needs a decoupling capacitor across the battery.? You should solder an additional 10uF cap across the pins of the battery jack J1.
2.? The audio and key jacks are recessed by about a millimeter.? Normally this isn't a problem, but one my plugs fails to make good contact.? ?So, when soldering these jacks, please situate them as close as possible to the board edge.? The extra-large soldering pads give you some leeway.
I updated the builder's guide to reflect these two changes.
Bruce
|
Re: Pocket Tutor - software changes
Hi Ken. I am going to wait until the STM32 code?stabilizes before making changes to ESP32.? ? The more I play with the Pocket Tutor, the more I want to improve it :)
- Bruce ??
On Thu, Jul 16, 2020 at 8:59 AM Ken KM4NFQ < km4nfq@...> wrote: Hello Bruce W8BH,
Thank you!!! I have my ESP32 unit setup at present, so I'll wait for that code to be updated. My STM 32 unit is in a box in storage. I'll try and dig it out if you need someone to try it.
On Wed, Jul 15, 2020 at 8:12 PM Bruce Hall < bhall66@...> wrote: Done. It's time to bring some of the new features back to Morse Tutor:
1.? There is a new menu item:? Config-Screen, which lets you set the default startup screen, the screen brightness, and the screen foreground/background colors.
2.? Changing?the screen brightness has no effect unless you modify your Morse Tutor hardware to take advantage of this function.? I can help if anyone is interested.?
3.? The latest code suppresses the on-board LED from flashing Morse.? If you want to keep the flashing LED, change the value of SUPPRESSLED?to false.
4.? If you install this code, your display will look terrible at first (random foreground/background colors).? ?Go to Config-Defaults to fix.
5.? There are only a few color choices.? ?I started with more, but kept coming back to a black or blue background and light-colored text.? Let me know what you think.
6.? Some user-builds are very finicky regarding how the hardware is initialized.? If, for any reason, your hardware does not seem to work with this new code, I saved the previous code on GitHub here: (Technically speaking, GitHub saves all previous versions; I just wanted to make it is easy to find.)
7.? If anyone has an STM32 unit that can't save its configuration, I would appreciate hearing from you.? This version *might* work better.
8.? This update is for the STM32 version only.? ?I have not modified the ESP32 version.
The latest source code and binary are here: ??
- Bruce
?
On Wed, Jul 15, 2020 at 6:57 AM Ken KM4NFQ < km4nfq@...> wrote: Hello Bruce W8BH
I would like to see that last one implemented on the W8BH Morse Tutor!
On Wed, Jul 15, 2020 at 12:11 AM Bruce Hall < bhall66@...> wrote: I added a few features to Pocket Tutor: - battery icon: displays current battery charge in bars & voltage - low battery warning that is audible and visual - adjustable screen brightness 10-100% - user selectable text color - user can choose default activity on startup.
I really like the?last feature.? When I turn on my unit, it goes straight to my favorite activity (random words).
Bruce
|
Re: Pocket Tutor - software changes
Hello Bruce W8BH,
Thank you!!! I have my ESP32 unit setup at present, so I'll wait for that code to be updated. My STM 32 unit is in a box in storage. I'll try and dig it out if you need someone to try it.
On Wed, Jul 15, 2020 at 8:12 PM Bruce Hall < bhall66@...> wrote: Done. It's time to bring some of the new features back to Morse Tutor:
1.? There is a new menu item:? Config-Screen, which lets you set the default startup screen, the screen brightness, and the screen foreground/background colors.
2.? Changing?the screen brightness has no effect unless you modify your Morse Tutor hardware to take advantage of this function.? I can help if anyone is interested.?
3.? The latest code suppresses the on-board LED from flashing Morse.? If you want to keep the flashing LED, change the value of SUPPRESSLED?to false.
4.? If you install this code, your display will look terrible at first (random foreground/background colors).? ?Go to Config-Defaults to fix.
5.? There are only a few color choices.? ?I started with more, but kept coming back to a black or blue background and light-colored text.? Let me know what you think.
6.? Some user-builds are very finicky regarding how the hardware is initialized.? If, for any reason, your hardware does not seem to work with this new code, I saved the previous code on GitHub here: (Technically speaking, GitHub saves all previous versions; I just wanted to make it is easy to find.)
7.? If anyone has an STM32 unit that can't save its configuration, I would appreciate hearing from you.? This version *might* work better.
8.? This update is for the STM32 version only.? ?I have not modified the ESP32 version.
The latest source code and binary are here: ??
- Bruce
?
On Wed, Jul 15, 2020 at 6:57 AM Ken KM4NFQ < km4nfq@...> wrote: Hello Bruce W8BH
I would like to see that last one implemented on the W8BH Morse Tutor!
On Wed, Jul 15, 2020 at 12:11 AM Bruce Hall < bhall66@...> wrote: I added a few features to Pocket Tutor: - battery icon: displays current battery charge in bars & voltage - low battery warning that is audible and visual - adjustable screen brightness 10-100% - user selectable text color - user can choose default activity on startup.
I really like the?last feature.? When I turn on my unit, it goes straight to my favorite activity (random words).
Bruce
|
Re: Pocket Tutor - software changes
Done. It's time to bring some of the new features back to Morse Tutor:
1.? There is a new menu item:? Config-Screen, which lets you set the default startup screen, the screen brightness, and the screen foreground/background colors.
2.? Changing?the screen brightness has no effect unless you modify your Morse Tutor hardware to take advantage of this function.? I can help if anyone is interested.?
3.? The latest code suppresses the on-board LED from flashing Morse.? If you want to keep the flashing LED, change the value of SUPPRESSLED?to false.
4.? If you install this code, your display will look terrible at first (random foreground/background colors).? ?Go to Config-Defaults to fix.
5.? There are only a few color choices.? ?I started with more, but kept coming back to a black or blue background and light-colored text.? Let me know what you think.
6.? Some user-builds are very finicky regarding how the hardware is initialized.? If, for any reason, your hardware does not seem to work with this new code, I saved the previous code on GitHub here: (Technically speaking, GitHub saves all previous versions; I just wanted to make it is easy to find.)
7.? If anyone has an STM32 unit that can't save its configuration, I would appreciate hearing from you.? This version *might* work better.
8.? This update is for the STM32 version only.? ?I have not modified the ESP32 version.
The latest source code and binary are here: ??
- Bruce
?
On Wed, Jul 15, 2020 at 6:57 AM Ken KM4NFQ < km4nfq@...> wrote: Hello Bruce W8BH
I would like to see that last one implemented on the W8BH Morse Tutor!
On Wed, Jul 15, 2020 at 12:11 AM Bruce Hall < bhall66@...> wrote: I added a few features to Pocket Tutor: - battery icon: displays current battery charge in bars & voltage - low battery warning that is audible and visual - adjustable screen brightness 10-100% - user selectable text color - user can choose default activity on startup.
I really like the?last feature.? When I turn on my unit, it goes straight to my favorite activity (random words).
Bruce
|
Re: Pocket Tutor - software changes
Hello Bruce W8BH
I would like to see that last one implemented on the W8BH Morse Tutor!
On Wed, Jul 15, 2020 at 12:11 AM Bruce Hall < bhall66@...> wrote: I added a few features to Pocket Tutor: - battery icon: displays current battery charge in bars & voltage - low battery warning that is audible and visual - adjustable screen brightness 10-100% - user selectable text color - user can choose default activity on startup.
I really like the?last feature.? When I turn on my unit, it goes straight to my favorite activity (random words).
Bruce
|
Pocket Tutor - software changes
I added a few features to Pocket Tutor: - battery icon: displays current battery charge in bars & voltage - low battery warning that is audible and visual - adjustable screen brightness 10-100% - user selectable text color - user can choose default activity on startup.
I really like the?last feature.? When I turn on my unit, it goes straight to my favorite activity (random words).
Bruce
|
Hello Bruce W8BH,
Thanks for the SMD Soldering PDF. I will take a look at it. I do have solder wick, and I have used it on SMD parts as needed. It works quite well.
On Sat, Jul 11, 2020 at 1:41 PM Bruce Hall < bhall66@...> wrote: Hi Ken.
The microcontroller?is not difficult to solder.? I drag-solder across the pins with my soldering iron, then go back and remove the inevitable solder bridges.? There is plenty of space around the component.
For me, the USB connector is the hardest component to solder.?
There is a short writeup on my website about surface-mount soldering.? It isn't a tutorial, just a few notes on what I do. ??
- Bruce ??
On Sat, Jul 11, 2020 at 9:02 AM Ken KM4NFQ < km4nfq@...> wrote: Hello Bruce W8BH,
Thank you for all the work you have put into this project, and thank you for sharing it with us. Your documentation is the Best. I am hoping that I will be able to put one of these together in the near future. I have some limited experience soldering SMTs, but I have never soldered a .5mm pin microprocessor. However, I do? have some solder paste, a hot air gun, and a repurposed toaster oven (now a reflow oven).
On Fri, Jul 10, 2020 at 7:46 PM Bruce Hall < bhall66@...> wrote: Initial-draft documentation is now complete: Part 1:? Part 2:? Part 3:? Part 4:? Part 5:? Part 6:? Schematic:? Gerbers:? Source Code:???
Please note that this is "version 0.1" hardware: it works, but probably not issue-free.? I will post any issues as I find them.
- Bruce
|
Hi Ken.
The microcontroller?is not difficult to solder.? I drag-solder across the pins with my soldering iron, then go back and remove the inevitable solder bridges.? There is plenty of space around the component.
For me, the USB connector is the hardest component to solder.?
There is a short writeup on my website about surface-mount soldering.? It isn't a tutorial, just a few notes on what I do. ??
- Bruce ??
On Sat, Jul 11, 2020 at 9:02 AM Ken KM4NFQ < km4nfq@...> wrote: Hello Bruce W8BH,
Thank you for all the work you have put into this project, and thank you for sharing it with us. Your documentation is the Best. I am hoping that I will be able to put one of these together in the near future. I have some limited experience soldering SMTs, but I have never soldered a .5mm pin microprocessor. However, I do? have some solder paste, a hot air gun, and a repurposed toaster oven (now a reflow oven).
On Fri, Jul 10, 2020 at 7:46 PM Bruce Hall < bhall66@...> wrote: Initial-draft documentation is now complete: Part 1:? Part 2:? Part 3:? Part 4:? Part 5:? Part 6:? Schematic:? Gerbers:? Source Code:???
Please note that this is "version 0.1" hardware: it works, but probably not issue-free.? I will post any issues as I find them.
- Bruce
|
Hello Bruce W8BH,
Thank you for all the work you have put into this project, and thank you for sharing it with us. Your documentation is the Best. I am hoping that I will be able to put one of these together in the near future. I have some limited experience soldering SMTs, but I have never soldered a .5mm pin microprocessor. However, I do? have some solder paste, a hot air gun, and a repurposed toaster oven (now a reflow oven).
On Fri, Jul 10, 2020 at 7:46 PM Bruce Hall < bhall66@...> wrote: Initial-draft documentation is now complete: Part 1:? Part 2:? Part 3:? Part 4:? Part 5:? Part 6:? Schematic:? Gerbers:? Source Code:???
Please note that this is "version 0.1" hardware: it works, but probably not issue-free.? I will post any issues as I find them.
- Bruce
|
Initial-draft documentation is now complete: Part 1:? Part 2:? Part 3:? Part 4:? Part 5:? Part 6:? Schematic:? Gerbers:? Source Code:???
Please note that this is "version 0.1" hardware: it works, but probably not issue-free.? I will post any issues as I find them.
- Bruce
|
Great Bruce. Let us know when the gerbers are ready.
I'm not sure if you mentioned Kicad when building the previous morse tutor, but I taught myself enough to design a board and had it produced by JCLPCB. Came out great!
I think I will look at those tutorials you mentioned. 73 Ken WB2ART?
On Thu, Jul 9, 2020, 3:25 PM Bruce Hall < bhall66@...> wrote: I just posted a draft of the sixth and final part: ?
Gerbers and schematic will be ready shortly.
- Bruce.
Part 5 is now posted:
- Bruce ?
I posted a draft of part 4 (audio): ?
- Bruce
|
I just posted a draft of the sixth and final part: ?
Gerbers and schematic will be ready shortly.
- Bruce.
Part 5 is now posted:
- Bruce ?
I posted a draft of part 4 (audio): ?
- Bruce
|
Wow! Those parts look really good, Bruce W8BH. I always enjoy reading your technical documentation. Everything is always presented in a clear, understandable manner. Looking good!
I don't think I have ever seen an SMD speaker before? Thanks for the link to Dave's PCB Design Tutorial. What are you using for a portable paddle/key?
On Thu, Jul 9, 2020 at 8:47 AM Bruce Hall < bhall66@...> wrote: Part 5 is now posted:
- Bruce ?
I posted a draft of part 4 (audio): ?
- Bruce
|
Bruce Hall
Ken KM4NFQ