thomaseliot said:
I do remember that thread 🙂 Thanks for that info! I went ahead and purchased some T106 MPP and Sendust cores from CWS to compare whenever this TAS5261 based amp comes to life.
I'd say about 50mA worth for the 12V Vdd for the TAS5261. The amount of current required for the 3.3V supply would depend on the kind of load you'd put on the output of the TPA2000. The chip itself would be good for about 10mA and the amount going to the load would be the rest. We don't have to load this little guy down much at all, so a load of say 100 ohms would draw about 33mA from the 3.3V supply. So we could maybe say another 50mA draw from the TPA2000. That brings us to about 100mA so far. From that you can see that the 12V supply needn't have a very large current rating. A simple 12V wallwart would work fine but you could get as crazy as you want.
thomaseliot said:
I've been a big fan of the Equibit stuff for quite a while, but apparently I'm WAY behind the curve. I had no idea they were adding DSP features directly to the modulator. Assuming you can keep the processing to the minimum required so as to not mess up the signal, the 5518 looks amazing. The EVM kit @ $399 is an amazing bargain considering that it includes a USB based controller to setup/initialize the 5518.
Swap out the inductors for your MPP units and add a good power supply (I've had good luck with batteries) and it could be a very very good unit.
dwk123 said:
Minimum requirements for the modulator are I2S signals, just like a normal dac, and I2C signals: series of 8bit registers for volume control.
What let you feel "behind the curve" is only this:
This is the standard PC->I2C adapter design from Philips. I'm still looking for a software to easily bit-banging the module.
TI evaluation board include the adapter and a custom software for controls:
We would find a way to get this software 😀
Well, good to see this is progressing. I've been geting my Symasym up and running so I haven't been able to look at this for a while. I've posted a couple of chips to Brian for his testing, hopefully he should get them soon.
I must admit, Brian's SMT board scares me a little, so I think I will go for a complimentary style using normal components where possible. I think I will also look at using a separate 12V supply for the low voltage side of things, rather than a switcher from the 50V rail. If someone is ordering some of those CWS cores , if they could get a couple for me I will be more than wiling to Paypal the the money to them to cover their costs, but I don't have a credit card to buy them myself.
I must admit, Brian's SMT board scares me a little, so I think I will go for a complimentary style using normal components where possible. I think I will also look at using a separate 12V supply for the low voltage side of things, rather than a switcher from the 50V rail. If someone is ordering some of those CWS cores , if they could get a couple for me I will be more than wiling to Paypal the the money to them to cover their costs, but I don't have a credit card to buy them myself.
Hi Pinkmouse,
Maybe I can get some MPP from a distributor of Magnetics here in Italy. If so I can send you some.
Brian,
Why TI Ev board has 4 10uH coils, 2 x channel?
Maybe I can get some MPP from a distributor of Magnetics here in Italy. If so I can send you some.
Brian,
Why TI Ev board has 4 10uH coils, 2 x channel?
pinkmouse said:
I'll be sure to let you know when I see them in the mail.
Don't be scared of SMDs. They're easier to solder than through hole components once you get the hang of it. Easier to rework too if you don't have to save the components.
I ordered 4 MPP and 4 Sendust cores (both with a permeability of 60) as well as some 16ga and 18ga wire through CWS using my paypal account. The total came to about $30. You don't need a credit card to order through them which is kinf of nice. I would have gotten more cores but I only had $40 some bucks in my account and only wanted to use what funds were available.
I can send you the Sendust cores and some wire if you'd like, since you were kind enough to send me some chips 🙂
Make that about 5 of us then!
Some updates on the board progress. I was looking at different regulators for the 12V and 3.3V supplies and have come to the conclusion that it would probably be simplest to use a regular old adjustable TO220 style regulator for both. Anyone against that idea? That way you can use an external unregulated wall wart transformer, rectifier, and cap to feed the 12V regulator on board. The 3.3V regulator will draw power from the 12V regulator and will be well filtered.
Some updates on the board progress. I was looking at different regulators for the 12V and 3.3V supplies and have come to the conclusion that it would probably be simplest to use a regular old adjustable TO220 style regulator for both. Anyone against that idea? That way you can use an external unregulated wall wart transformer, rectifier, and cap to feed the 12V regulator on board. The 3.3V regulator will draw power from the 12V regulator and will be well filtered.
Count me in, please. But I´m sorry to say that I can´t contribute much due to lack of time and knowledge.
Very nice !
So, how is the board? Nothing against the idea of using normal regulators, since it's well filtered.
Could you make a normal components board layout? I never soldered smd things... But if you don't, no problem, I must start the "smd culture" 😉
So, you're ordering different inductors to listen to them and decide which one sound better? 😎
Kind Regards,
Fernando
So, how is the board? Nothing against the idea of using normal regulators, since it's well filtered.
Could you make a normal components board layout? I never soldered smd things... But if you don't, no problem, I must start the "smd culture" 😉
So, you're ordering different inductors to listen to them and decide which one sound better? 😎
Kind Regards,
Fernando
So it looks like there are a few more interested parties and I'm sure others will be peering over the fence waiting to see something that works 🙂
I prefer to use surface mount components for class d amps because they not only have less parasitics but allow you to come up with a more optimized and compact layout. I believe Al (pinkmouse) said he was working on a through hole version. You can bug him about that because I don't plan on making a through hole version.
I have T106 MPP and Sendust cores and 16 and 18ga wire on the way from CWS. They have fairly similar characteristics and the same permeabilities but the MPP cores cost twice as much. The initial comparison would be between the different cores wound with 16ga wire. I would also like to eventually compare inductors wound with one strand of 16ga versus two (or three if it will fit) strands of 18ga.
-_nando-_ said:
I prefer to use surface mount components for class d amps because they not only have less parasitics but allow you to come up with a more optimized and compact layout. I believe Al (pinkmouse) said he was working on a through hole version. You can bug him about that because I don't plan on making a through hole version.
I have T106 MPP and Sendust cores and 16 and 18ga wire on the way from CWS. They have fairly similar characteristics and the same permeabilities but the MPP cores cost twice as much. The initial comparison would be between the different cores wound with 16ga wire. I would also like to eventually compare inductors wound with one strand of 16ga versus two (or three if it will fit) strands of 18ga.
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