Class-D-Audio
Any word upon when the SMPS will be complete?
Another question. Is there any chance you are working on a 12 volt trigger option to turn the amps on in a Home Theatre situation?
Thanks,
Joel
Any word upon when the SMPS will be complete?
Another question. Is there any chance you are working on a 12 volt trigger option to turn the amps on in a Home Theatre situation?
Thanks,
Joel
I wired a 10A relay with 12V/18mA coil into mine. It seems to work fine.
The sound of these amps (IRS 250/500) is really nice, by the way. I can't tell the difference really, sound-wise, between these and the Class AB ones in my RX-Z7 receiver. This is probably a good thing since the Yamaha amps are quite good. Of course, I didn't try to do a real blind test, but I am probably a member of the "amps don't make any difference" camp anyway. These are really nice though, because they are quiet, efficient, sound nice and clean, and don't add any particular coloration to the overall sound that I notice.
- Doug
Doug,
Can you give me a schematic or picture of how you made your 12 volt trigger and how you hooked it up to the amp?
Joel
Can you give me a schematic or picture of how you made your 12 volt trigger and how you hooked it up to the amp?
Joel
It's a little crude but here you go:
An externally hosted image should be here but it was not working when we last tested it.
I used this relay (Allied Electronics sells it as well):
Digi-Key - PB443-ND (Manufacturer - T75S5D112-12)
and this switch:
SWITCH ROCKER ILLUM SPST 10A BLU - CLS-RR11A125500B
You might want to check the specs of your receiver triggering voltage; mine is 12VDC/15mA. I used a small PC board from Radio Shack to mount the relay (had to drill one extra hole). You need to be careful soldering the contacts (I scraped off some of the unused copper circles to avoid the possibility of shorts). I wired the LED in the switch in parallel with the coil for the relay with a resistor to dim it (10-15k ohms was about right), so it works off the triggering voltage as well. Not as nice as having an independent power supply for the LED (since it doesn't come on if you just use the switch to turn the amps), but it was an easy solution. If I knew enough to design a simple circuit to convert the extra 18v AC (brown leads) available on the transformer to 12V DC with the right power range I would probably have done that to create an independent 12V supply from the unit itself.
- Doug
Hi Joel,
The SMPS is really about finished. The hold up now is we had to have all custom built transformers and inductors made. We have some of then, but the gate drive transformer came to us with the wrong footprint so they have to be made again. We have the PCB's and everything is great so far.
As for a timer circuit, yes, I'm working on one. I've prototyped one and it works fine, but I'm making some more mods to it to make it a little better before production. Might be another month, depending on how much time I get to do my design work.
Tom
in this case this thread could be of interest:
http://www.diyaudio.com/forums/clas...ic-about-rev-engin-not-complete-finished.html
http://www.diyaudio.com/forums/clas...ic-about-rev-engin-not-complete-finished.html
Hi Tom,
Excellent.
Are you able to tell us what size the SMPS's output ripple (p-p) is?
thanks
🙂
I think if you wish to appeal to the DIY community, who has to spend their labor to get your product into a shape where they can decide whether they like it or not, and who's labor isn't always so freely at hand that they can rush to doing a project within seven days of ordering, you should consider standing by your product a bit better.
Joe.
From what I've seen Class D have offered nothing but stellar customer relations/services. The fact they offer a 7 day money back guarantee doesn't degrade the perceived value of their products, more it gives you the confidence to buy in the first place.
Lots of people prefer to audition equipment before buying, this is impossible with the ClassD amplifiers. If you were to dislike what you had purchased, you'd be stuck and a few hundred dollars down. The 7 day return gives you ample time to audition the product in your own home.
Yes, their amplifier modules require a little bit of work to get up and running, but seriously? You're aware of this fact before you buy. If your schedule is full and hectic it's your own fault if you buy and don't have enough time to use the amp.
There are many simple life circumstances that can be not one's fault that can interrupt a good week. Really, the interruption doesn't even have to be the week, just the weekend. Many DIY'ers don't have weekdays to work on things, only weekends. So if something unexpected pops up that blows two days, *poof*. "Seriously".
--Joe.
Thanks a lot Mark, I was just getting caught up on my Visa 🙂
I have got to try one of those amps now, they sound very interesting.
Nice looking product and very reasonable pricing Tom, I can't wait to get my hands on one of them.
I just ordered one of your 600W kits, I will put it through the paces and compare it to some of the equipment I currently have, an assortment of stock and modified Threshold and Hafler amps.
I will be sure to let the guys at work know about them as well.
I have got to try one of those amps now, they sound very interesting.
Nice looking product and very reasonable pricing Tom, I can't wait to get my hands on one of them.
I just ordered one of your 600W kits, I will put it through the paces and compare it to some of the equipment I currently have, an assortment of stock and modified Threshold and Hafler amps.
I will be sure to let the guys at work know about them as well.
Yes and ClassD being the reasonable people they are, I'm sure they'd let you return the amp after a bit longer then the specified week if you had a crisis pop up. From my perspective ClassD seem to realise that we are all only human, mistakes can happen and that during an economical crisis they are more likely to make successful sales if they offer a money back guarantee should the product not live up to your expectations.
What would you rather, they remove the money back after a week thing entirely?
When it comes to other people's investments, It's more their policy that matters rather than your perspective of it. The crisis has nothing to do with it, people in crisis aren't spending much on toys.
Perhaps however in a time of economical crisis when the purse strings are tighter, a seven day money back guaranty might be just the marketing ploy required to help loosing the purse strings. As assurance it is all but pointless. Nobody really builds an amp from start to finish in just seven days, but I appreciate how you considered that their fault.
Rushing the job isn't the means to a fine solution, and how many hobbyists who've the need to purchase a datasheet-direct module such as these have the kind of sophistication to orchestrate a complete built such that all necessary components arrive at the same time to even begin work on it? How much time should be set aside for optimizing it as required as they learn the very basics? It is absurd to even think they should have to meet that requirement. It's also their fault if they buy into an empty promise.
Normally when a company offers such a money back guaranty, it's for thirty days, and for a finished product that's ready to rock from day one. That's thirty full days of evaluation with no build time. People buying a finished product aren't concerned with the quality of their work or finishing, neither need they concern theirs elves with dependent components arriving before the clock starts ticking.
For those reasons even a thirty day period is suspect on a diy module of any sort, while seven is really hitting a limit. One might be inclined to think its usefulness is served in excusing one from a purchase made without sufficient forethought or research. If they could truly stand behind their product, what use would they have for such a ploy at all. Also, who gets the returned modules? Not you of course, but surely somebody, they don't just throw them away, after all.
You're not building an amp from start to finish in seven days. The modules come fully assembled, all you need to do is attach input/output connectors and a power supply. This is hardly a difficult task, nor a time consuming one. However I think you are aware of that considering your next paragraph.
I'd expect anyone interested in the modules to sort out a power supply and connectors before they order the ClassD product. After all those are the only things you require to use the amp.
There isn't any optimising, you plug in a PSU and a few connectors and you listen to music.
If the buyer in question isn't able to do that, then they shouldn't have purchased a module in the first place. Or, if this is the first DIY project they are going to approach, I'd expect them to build a PSU first, to make sure they are capable of getting that sorted, before buying the module. Afterall, why spend $150+ on something you might not be capable of using?
Any company should be able to stand by their products. But that doesn't mean to say everyone is going to be satisfied with them. People demo equipment for a reason.
I'd expect any returned modules to be thoroughly tested by ClassD. If they pass the test then why should I have a problem if someone else tried the module before me?
I really don't understand the nature of this question though. People buy goods and return them every single day, how's that any different from this?
Let's not jump to any wrong conclusions from all of this mind you.
I fully appreciate the points you were trying to make and I agree with you mostly, as looking at it from a different point of view.
But from my perspective you either play the game by their rules, or you don't. If you don't that's your fault and you risk getting burnt.
Being aware of a 7 day money back period, you should make sure you've got everything else sorted. So that when the module/s do arrive, all you need to do is attach a few things and you've got music within 30 minutes.
All you need now is perhaps a couple of hours to listen to the product. It is your responsibility to find the time.
Well that much is obvious. Thing is, what we're suggesting is that they change their rules. The "seven day guarantee" is, as Ltralus said, an empty promise and a marketing ploy. It's also kinda silly. The law actually requires more of them than this given just a few choice words from the customer ("fitness for merchantability and a particular use"), so it will cost them nothing to make a longer guarantee. They're just not thinkin' this through properly.
All that said, their product does appear to be high quality, don't get me wrong.
Joe.
Well, you may return the modules, and buy new ones costing twice as much, and get stuck with those, happy or not
Anyway, I dont see any EU people getting involved in returning any modules
Tell me, how will you get the custom fee and taxes refunded, or return shipping
Besides, so far everyone seems happy with these amp modules
Why do you argue about a money back offer, that noone else will give you
You know the "rules" of DIY, either it works, or it doesnt
Its all about buying modules that work
And deal with serious people with a minimum of responsibility
Way more important than any money back policy
And one reason why we are here, to share all info and insight
We should not debate how a company handle their economical affairs, as long as they are fair and honest
We should rather talk about the modules, please
Anyway, I dont see any EU people getting involved in returning any modules
Tell me, how will you get the custom fee and taxes refunded, or return shipping
Besides, so far everyone seems happy with these amp modules
Why do you argue about a money back offer, that noone else will give you
You know the "rules" of DIY, either it works, or it doesnt
Its all about buying modules that work
And deal with serious people with a minimum of responsibility
Way more important than any money back policy
And one reason why we are here, to share all info and insight
We should not debate how a company handle their economical affairs, as long as they are fair and honest
We should rather talk about the modules, please
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Well exactly I don't know why anyone would bring up the 7 day return period at all. I just thought it unfair for someone to knock the company, that are after-all offering a lot more then others.
Personally I'm waiting on the SMPS to be completed.
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