Audio (voice) - Stock 9X PCB

[jhsa]

Mike, I didn't know. that's how the voice is called, and I do like it.. if you want I can edit my post about the sexy voice, no ofense meant..

I'm confused, where do the caps go? one seems to be the one connecting to the PWM output and the resistor that goes to pin 3 of the amp.. but the second cap you said on an earlier post that connects to pin 2 of the amp? that's the beeper input, not the voice input, or am I missing something..

João

Mike I've just noticed. Both my radios are saying 1 minutes instead of 1 minute...

[GTiDon]

This board is looking complicated and could be a mission for some of us to get all the parts. It would be great if somebody could put kits together and sell it. It really wont bother me if somebody turns a profit distributing kits with a printed board.

Sent from my LT18i using Tapatalk 2

[MikeB]

I'm confused, where do the caps go? one seems to be the one connecting to the PWM output and the resistor that goes to pin 3 of the amp.. but the second cap you said on an earlier post that connects to pin 2 of the amp? that's the beeper input

Oops, typo, I should have said pin 3, I've edited the original post.
First capacitor, you have a 1K resistor from PD5 of the '328 (pin 11 of 28 dip) along with 560K and 470K from PD6 (pin 12 of 28 dip), this capacitor is connected to ground from where all three resistors join together.
The second capacitor is the one from pin 3 of the LM386 to ground.
So I have the first one as 10nF and the seconfd one as 2.2nF now.

Mike.

[jhsa]

right, thanks.. Now I got it.. and wrote the values on the printed schematics I have here...
I will change them when you give the OK, and update the module as soon as you release new fw for it..
At the moment I've made the mistake of shrinktubbing the module and closing the radio..
next time I close it will be with all the features you're workin on..
Did you mention before that it could be possible to update the sound module using the serial connection to the PC, or did I misunderstand it?

Joao

[MikeB]

I hope to be able to update over serial. I did manage to use ymodem protocol to the ersky board and write a file to the SD card, so I have some of the code already done.
Will still need the FATFS updating to allow file creating and writing, and I will need the ymodem working the 'other' way to allow reading files.
I'm also wondering if we could include a bootloader, so we could update the firmware over the serial as well. All will be nice if we can.
I'm just trying to make sure the hardware design is right first.

Mike.

[jhsa]

sure, thanks..

[SFflyer]

As suggested by GTiDon I was considering sourcing components from RS and supplying sets of parts at cost. To buy a complete set of components for HaGeHa's schematic would be around £70 given minimum order quantities on most items - for making up 5 sets this cost drops to around £20 and falls to £14 for 50 (the minimum cost per set). Please note that these estimates include UK VAT and do not include PCB, SD board or connector headers (or postage). Once we have a finalized design and board layout we can get a definitive cost.
I've done most of the upgrades on my 9x and have found this forum invaluable so maybe I could give something back by doing this. I wouldn't be looking to make a profit.
How many of you would be interested ?

[MikeB]

You may get better prices from http://www.rapidonline.com/, RS can be a bit pricey.

Bear with me folks, regarding these capacitor values, I changed the wrong one to 2.2nF, and I also found the LM386 does not like a feedback capacitor alone.
I think I shall settle for just the 2nd order filter, but need to get the capacitor values correct for this, next effort will be 22nF and 4.7nF. I;ll be trying that tomorrow.

Mike.

[jhsa]

Mike, but what is wrong with the ones we have now? 47n and 10n? I mean I can't really hear noise apart from the clicks and the normal sshhh noise from the amp..

[rabono]

I got more Frsky sensors along with them got more questions
- Is there any way to get the voice faster I mean between digits spoken to shorter the blank?
- on the Flvs-01 I get only 1 cell spoken How to get 3 of them in sequence ?
- THE fAS-100 says the# of amps is there a way to have it saying the watts (maybe in a next firmware)?

[jhsa]

you could build this new module. It's much faster then the emartee module.

[MikeB]

Mike, but what is wrong with the ones we have now? 47n and 10n?

While they remove the PWM noise, they also remove a lot of the voice signal as well, 2kHz is down to 70%, 4kHz is down to 39% and 8kHz is down to 14%. This means that using a voice sampling frequency above 16 kHz (twice the 8 kHz above) won't achieve much, if anything. The PWM noise is reduced to 0.5% by these capacitors.
Using 22nF and 4.7nF should keep 2kHz at 92%, 4kHz at 74% and 8kHz at 42% while the PWM noise is at 2%. This should sound much better.

Mike.

[jhsa]

Good explanation, thanks.. will open my radio and and change them as soon as you release new FW, then I will do all at once and hopefully I won't need to open it again.. that's my oldest radio and the plastic doesn't like to be openned that often

[SFflyer]

Mike, you are right - resistors for example are much cheaper. Rapid don't have the full range of components needed though as far as I can see. Looks like the costs for e.g. 5 sets would fall to around £12 and could/should be lower for higher quantities.
Offer still stands.

[bill516]

SFflyer

I've been doing some research on the costing and suppliers and like you have not found one supplier who has all components. Rapid online are cheapest but you have to order 100 min resistors and caps plus postage which is a £5. Best value I have come across on EBay is E-component from Mary £6.99. 32 different caps 50 of each and 50 different resistors 40 of each. The resistor pack gives all the values needed for this module but the cap pack does not have the 10uF 100uF and 47uF these will need to be bought.
Coldtears electron for atmega 328au x1 £3.01,
Discount Devices Shop bc 846 x 10 for £1.88, 2n7002 x 10 £0.99 p&p 0.99
Tinxi-global shop for the reg 1117 3.3v x 10 and 5v x 10 £1.75 and £1.65.

P&P is free from all except Discount Devices shop, then you have a long time to wait for delivery.

Mike for flashing the atmeaga could it be done through the sd card slot if an adapter is made up for fit into the card holder assuming you dont use a micro sd slot, that way you wouldnt have to open the box up to flash.

[jhsa]

hopefully we will bw able to do it through the serial connection with the PC. then you also don't have to open the radio..

Joao

[bill516]

The more I look at this the more it is looking like it will be a group buy, just playing on rapidonline and got to £16 just for res and caps, and not all the caps. The three uF value caps are the hardest to find, are they the ones Mikes looking at, at the moment?

[hageha]

I bought all SMD:

http://www.reichelt.de/

even small quantities.

Hans

[MikeB]

If doing a bulk buy from Rapid, postage is free for an order over £35.

Mike.

[bill516]

The reichel.de option is out of the window 10 euro min order and 19 euro post, On the plus side you can order just the quantity you want. I did a quick add to my basket of caps and resistors and it came to just over 4 euros.

[jhsa]

I bought from Reichelt too.. i think they sell abroad also.. postage might be a bit more expensive though. to Germany is Euro 5.60
If you buy from them and do a through hole board you might want to look at this 3.3V regulator.. that's what I use

http://www.reichelt.de/ICs-LMC-LS-/LP-2 ... c4c80d7f12

[Spoogy]

Okay, finally I'm also prepairing to do this mod. Where I can now found the final part list what is needed?

[tigar]

I am in for a kit.

[hageha]

A possible "T version" in SR1206.
As I said,
Problem is an appropriate switch.
Another variant would be to put a shorter board up on the "T-Board".
Tighten with the M4 screw.

[jhsa]

couldn't we use the same switch?

[MikeB]

Lots of good ideas for a 'production' board. Here is another idea.
I've been looking inside the radio and I notice there is some space near the top. I reckon there is an area about 31mm but 82 mm between the top of the gimbals and the pillars for the case screws and between the pot on one side and the switch on the other. Such a board also overlaps an unused screw hole on each gimbal that might allow easy mounting. If more space is needed, then the board could be larger, but would need holes to alloe the case screw pillars to pass through.

I've tested the 22nF and 4.7nF capacitors. Audio sound quite good to me, and that's with the 8-bit, 16kHz files from the emartee module. There is about 100mV peak-to-peak of PWM noise on the output, which is about what I would expect.

Mike.

[jhsa]

If you leave the PWM always on as you say, would that be audible?

[MikeB]

Never at 46.875 kHz. I have my PWM always on now. It also saves 12.8 mS before each voice file output, and another 12.8 mS after, so 25.6 mS between files. These are the times taken for the anti-pop/click ramp up and ramp down.

Mike.

[jhsa]

you're right, we can't hear more than about 20KHz.. but I'm sure that my dog will hear it
Don't know if they can hear that high though.. but don't be surprised if you're attacked by a bat one day

João

[Oliver]

A possible "T version" in SR1206.
As I said,
Problem is an appropriate switch.
Another variant would be to put a shorter board up on the "T-Board".
Tighten with the M4 screw.

Great! Hans, as I understood, we can arrange all details in this area

and make shoter board, that we can place upward current beeper board and tighten with screw or downward and seal with doublesided tape?
It would be great for me, because I killed my Atmega with wrong fuses and I need new board, but I'm too lazy to desolder switch.
And about long jumpers. Can we make something using 1206 0R? Or make pads bigger? Soldering wires for jumpers on previous board was harder for me than soldering 0805.