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Messages - LukeZ

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News & Announcements / Re: Project Status
« on: Today at 03:57:01 PM »
October 22, 2017

The party was too good to last! One of our users who just ordered a "new" board has received instead the same board being sold this summer, with all the same, wrong components. As listed above all the "new" boards are in fact old boards with the parts manually replaced, but apparently they have not fixed all of them and certainly haven't tested all of them. Some do seem to be functional (the one they sent me is) but there is no guarantee what you will get.

I must conclude that Hobby King can not be trusted to get this right. It is not beyond their ability but they simply do not seem to care. If you have not purchased a board yet, I would suggest you do not unless you want to take a risk. If you have purchased a board, please examine closely the MOSFETs Q1 through Q8. If any of them have the markings "23EG" on them, they are wrong and your board will not function. The image below shows which components these are.

For those that receive faulty boards, you can take your chances and request an exchange, or if you want a refund let me know and I will provide you the email address of my contact at Hobby King so he can deal with this directly.

Open Panzer Help / Re: Air soft setup
« on: Today at 03:27:06 PM »
I'm really sorry to hear that, but thanks for letting me know, I will post in the other forums so people can be warned. You will need to submit a return at Hobby King. I will send you an email in just a minute.

Open Panzer Help / Re: Air soft setup
« on: Today at 12:57:28 PM »
I hate to say it, but this sounds like the faulty behavior we would expect if Hobby King sold you one of the boards from earlier this summer with the wrong MOSFETs. I don't know what kind of MOSFET they used but the result was that the connection was always live no matter what. This would explain what you are seeing.

The MOSFET that controls the airsoft motor is Q8 on the board, I've highlighted the location in the attached picture. I don't know how good your eyesight is, or your ability to take close-up photographs. Can you see any markings on this MOSFET? Does it looks like it has been resoldered by hand? Perhaps you can take a picture.

Open Panzer Help / Re: Lights did not work
« on: October 20, 2017, 09:35:41 AM »
You are correct, and I remarked on this recently here. I agree with you, the person who did the repairs was indeed unfortunate (having done this myself I know how tedious it is), and the quality of the solder-work is typical of Chinese standards.

But beggars can't be choosers. For now we're stuck with Hobby King, for better and worse.

News & Announcements / Re: Project Status
« on: October 20, 2017, 09:28:33 AM »
October 18, 2017

Update - I've finally been able to examine a board from Hobby King. As it turns out, they are not selling new-production boards, instead they have gone back and manually replaced the incorrect components on the originals. This is obvious from a visual inspection. In talking with some other people who have recently purchased boards theirs are the same.

Although this is no what Hobby King told us they were going to do, it is certainly within their right and no doubt it made economic sense to them.

I thoroughly tested the board and all functions work correctly, including the ones related to the MOSFETs that have been replaced. So far no one else has reported problems with their fixed boards. I think the coast is clear for anyone to proceed with these boards if they are still interested.

Open Panzer Help / Re: hobbyking/Heng long airsoft with no limit switch
« on: October 18, 2017, 06:07:19 PM »
Yeah, sorry that wasn't clear. I added a note to the Wiki so those in the future know to get the correct unit.

Open Panzer Help / Re: hobbyking/Heng long airsoft with no limit switch
« on: October 18, 2017, 05:27:41 PM »
I'm afraid the TCB is not compatible with the old version Heng Long units that don't use a limit switch. You can buy the correct ones from Taigen for ten bucks: click here. You'll still have to rewire it as shown in the Wiki.

Thanks for the feedback. I have contemplated a re-design using a higher wattage amplifier but I'm not convinced it's necessary. It would seem you do not think so. I will do some more testing with different speakers and leave the option open, but not pursue it for now.

I appreciate the sound files that you are creating. I thought the Panther G sounded good, and you did not even begin to exhaust the capabilities of the sound card. I assume you have seen this video, and perhaps it is even what you used for your source:

News & Announcements / Re: Project Status
« on: October 05, 2017, 05:43:00 PM »
Hobby King appears to have the TCB back in stock in the Global Warehouse, see here.

I have received no communication from HK since earlier this summer, nor have I been sent a sample to examine. Buy at your own risk!

Scout Dev / Re: Home Build
« on: October 05, 2017, 10:54:01 AM »
I haven't gone through the SEEED process so I haven't verified this information. But in the case of OSH Park, they provide an Eagle CAM file for creating the Gerbers. I see that SEEED does as well at the bottom of this page.

They give their Gerber files different names than OSH does, and arrange the files somewhat differently. I've gone through each layer and most of the default SEEED selections are fine, except for the silkscreens (as John discovered). But you can always adjust the layers yourself before generating the Gerbers.

In Eagle board view, go to File -> CAM Processor, then File -> Open -> Job and select the SEEED CAM file. Now you will see a bunch of tabs on the CAM Processor form that represent each Gerber to be exported. On each tab you are able to modify which layer belongs to that Gerber file.

For the Silk top we need to add layer 121 _tsilk

For the Silk bottom we need to add layer 122 _bsilk

All the other layers should be fine as-is.

For simplicity, I have attached SEEED Gerbers for all three Open Panzer projects to this post (the Scout is an odd case that removes layer 25 tNames from the top silkscreen because there isn't room for them, but we still need 121 _tsilk).

Again - I've not ordered these from SEEED so I can't promise the results. But they should be correct.

Open Panzer Help / Re: Halftrack settings for vintage Tamiya tanks
« on: October 03, 2017, 08:59:54 AM »
Very interesting, I have not encountered those before. They look very cool.

In fact I think you will want to set the Vehicle Type to the "Car" option. In OP Config each vehicle type has a description next to it, here are the four options:

  • Tank (Dual drive motors)
  • Tank (Single drive motor + steering motor, eg DKLM)
  • Halftrack (Dual drive motors + steering servo)
  • Car (Single drive motor + steering servo)
The Car option would also be suitable for halftracks that don't have independent tread motors (ie single rear axle). The Halftrack option assumes dual drive motors and is basically a tank + servo, so that's more than you need.

Jürgen I'm curious, what is your thought about the volume level of the sound card? Do you think it is loud enough for 1/16 scale operations?

I am using a Visaton FRS7-4 which is a 2.5" diameter, 4-ohm speaker. I don't have it in an enclosure, which would probably help. It seems pretty loud to me but I do all my testing on my desk rather than outside in an actual model, so that is not a good test in real conditions.

I am going to order the FRS8-4 (3.3" diameter) to see if the larger size makes any difference or not...

Jürgen has provided the first user-submitted sound set, for the "Panther G with Flammvernichter." I presume this would be appropriate for probably any Panther G?

I've posted it to GitHub here: OpenPanzerProject/Sound-Files/SoundSets/OpenPanzerSoundCard/

Click on the Zip file then click on the Download button. Unzip the file and copy the sounds to your Micro SD card, stick the card into your sound board and off you go.

You will notice a "README.txt" file included with the sounds. This will include some recommended settings for your TCB. For example, we want to set the length of the "Transmission Engage Delay" to the length of time of the engine startup sound (this prevents you from driving the tank while the engine startup sound is still playing). This information and other similar settings will be in that readme file.

Thank you Jürgen!

Any other sound sets I receive I will post to the same location.

Open Panzer Help / Re: Dual recoil servo - Coelian & Maus
« on: September 27, 2017, 06:11:47 AM »
I understand what you mean now, thanks for the clarification. And your English is quite good!

I will leave this on the to-do list but as I say it will probably not get done soon. In fact synchronized sequential firing would be even more complicated than arbitrary independent firing, since we would to add some kind of timing option for the user to adjust for their cannon type and sound file length. This is of course possible but the time required to implement vs the number of people who would use it is a poor ratio...

This is not a fault, but rather the consequences of the trade-off we were discussing earlier. If we need the maximum possible volume from any given sound at any given moment, we must accept distortion when multiple sounds are played simultaneously at full gain. But if we want to eliminate the possibility of distortion we have to limit individual sound volumes during synchronous playback at high overall volumes.

There is nothing you can do about it other than to adjust the volumes to 50/50 (or some other ratio lower than 90/90) or else only play multiple sounds when total volume is something less than 100% (you can adjust the overall volume from the transmitter using a function mapped to an analog channel). My original code took care of this automatically but as Jurgen pointed out the dynamic adjustments were definitely noticeable.

Using a 4-ohm speaker is a good idea. It won't directly address the issue discussed here but it will give you a louder sound for any given volume setting, so you could perhaps operate at less than 100% and thereby avoid distortion.

Ultimately we can re-design the board for a more powerful amplifier, with the same strategy as just described - if we make the total volume potential greater than actually required, the user can operate below 100%, leaving unused volume capacity available for distortion-free synchronous sound.

These limitations are common to any audio project. We perhaps do not notice them on other products because they pre-restrict the volume to begin with in order to avoid distortion, but here we give the user perhaps too much control such that the inner workings are more observable.

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