Hi,
rmsaudio,
http://en.wikipedia.org/wiki/RISC , no embedded OS.
The level of control it has over the amp was established in the first page or two of this thread, thanks for reading it. It watches the protection variables.
Lars, not exactly like the amp I got, mine wasn't so ready to use remember? I see you also have the aux supply winding in this one🙂 Mine has T-networks, snubbed bridges, and XLR connectors now, still with black gate N's for bypass. I'll probably throw a switch on sometime and some minimal IEC/DC filtering as well. What have you on the module as a seperate enable for the output stage Lars? There must be something on the MCU to leave the main PSU on with the amp disabled?
I expect to have a few good quality pics of mine up soon.
Maybe even some scope shots of it working post filter feedback mode, not sure if Lars has seen those yet because those solder pads are still clean 😀 It won't blow up though right.. right?
One module also has some sort of "ESD" device across the input pins for I think the negative rail and driver PSU, while the other module does not. I'm apt to removing the zobel network in post filter feedback mode, in addition to the MOV since it shouldn't be required with it, just for the least junk on the output as possible.
Cheers,
Chris
rmsaudio,
http://en.wikipedia.org/wiki/RISC , no embedded OS.
The level of control it has over the amp was established in the first page or two of this thread, thanks for reading it. It watches the protection variables.
Lars, not exactly like the amp I got, mine wasn't so ready to use remember? I see you also have the aux supply winding in this one🙂 Mine has T-networks, snubbed bridges, and XLR connectors now, still with black gate N's for bypass. I'll probably throw a switch on sometime and some minimal IEC/DC filtering as well. What have you on the module as a seperate enable for the output stage Lars? There must be something on the MCU to leave the main PSU on with the amp disabled?
I expect to have a few good quality pics of mine up soon.
Maybe even some scope shots of it working post filter feedback mode, not sure if Lars has seen those yet because those solder pads are still clean 😀 It won't blow up though right.. right?
One module also has some sort of "ESD" device across the input pins for I think the negative rail and driver PSU, while the other module does not. I'm apt to removing the zobel network in post filter feedback mode, in addition to the MOV since it shouldn't be required with it, just for the least junk on the output as possible.
Cheers,
Chris
The little mains board only carries a fuse, and terminates the mains wires. Nothing else.
About the VDR protection. If you release a coil with say 10 Amps going throgh it, and 100nF of capacitance, the flyback voltage will be in the kV range. So you need the VDR to catch that. Some people try to convince you that post filter feedback will negate the need for the VDR, yes, but the maximum compensation is 60V. So you have kV's minus the 60V.
About the VDR protection. If you release a coil with say 10 Amps going throgh it, and 100nF of capacitance, the flyback voltage will be in the kV range. So you need the VDR to catch that. Some people try to convince you that post filter feedback will negate the need for the VDR, yes, but the maximum compensation is 60V. So you have kV's minus the 60V.
When can we count on receiving our pre ordered modules?
Wasn't your intention to mail us with details about tracking number ?
Cheers!
Wasn't your intention to mail us with details about tracking number ?
Cheers!
Well you can say that i have a Zobel on the output, even if the circuit is nor actually working as a Zobel, it is still the same parts, as would normally be used as a Zobel. (Or snubber network for that matter).
In a Class D amplifier, these parts will be working as a Q dampener. But in fact with the new Low Q ferrite, i am not 100% sure that the Q dampener is still required.
On the other hand, the Q dampener is only working from some 200 kHz up, with a small linear capacity, so i really don't think the sound is affected in any way.
Simply removing the Q dampener would be like removing the brakes from your new car, to save a little weight, so you can accellerate faster. Something i also can not recommend. 😀
In a Class D amplifier, these parts will be working as a Q dampener. But in fact with the new Low Q ferrite, i am not 100% sure that the Q dampener is still required.
On the other hand, the Q dampener is only working from some 200 kHz up, with a small linear capacity, so i really don't think the sound is affected in any way.
Simply removing the Q dampener would be like removing the brakes from your new car, to save a little weight, so you can accellerate faster. Something i also can not recommend. 😀
In post filter feedback mode... I dunno, I'll take my chances with it removed.
Do you know how much rotors weigh? Standard practice to get lightweight aftermarket drilled rotors, they cool better too 🙂
Do you know how much rotors weigh? Standard practice to get lightweight aftermarket drilled rotors, they cool better too 🙂
Unique Features Include:
Lars,
Can you give us more details about these unique features you advertise?
-"Dual Slope Nano Alignment for Ultra Low Distortion"
What is this?
-"Effective Safety System, based on Seismic Sensors, without current limiting resistors."
What is a seismic sensor?
Thank you!
Lars,
Can you give us more details about these unique features you advertise?
-"Dual Slope Nano Alignment for Ultra Low Distortion"
What is this?
-"Effective Safety System, based on Seismic Sensors, without current limiting resistors."
What is a seismic sensor?
Thank you!
According to Wikipedia (url provided below) a seismic sensor works with the aforementioned risc controller to minimize your chances of catastrophic failure of Lars' new modules. I've quoted from Wikipedia below:
http://en.wikipedia.org/wiki/Seismic_risk
From what I gather the seismic sensors are employed to make sure that the risc controller miminizes the risk (pun intended) that your woofers cones don't suffer from overexcursion, or worse, by the module failing and putting the full power supply DC voltage across the output terminals. The loud 'thumph' this would cause is picked up by these seismic sensors and then fed back to the risc controller that does some damage control by shutting the modules down.
The nano alignment is there to makes sure all these safety measures kick in in mere nanoseconds to offer continued protection against such mishaps. In all honesty it is clear as day to me what Lars means with all his marketing speak. If not, he's not trying hard enough to find new cool acronyms for simple technology that's commonplace. Or rather Lars, cut it out with the BS marketing speak, you're not fooling anyone 🙂
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
Re: Unique Features Include:
I kind of think the Dual Slop Nano Alighnment is used to shape the PWM pulses such that switching between the output switches are more closely matched to minimize dead time.
Seismic Sensors? Well I suppose if you know the source impedances of different components, it's possible to implement a switch without additional resistance in the current path.
next said:
I kind of think the Dual Slop Nano Alighnment is used to shape the PWM pulses such that switching between the output switches are more closely matched to minimize dead time.
Seismic Sensors? Well I suppose if you know the source impedances of different components, it's possible to implement a switch without additional resistance in the current path.
Shaping PWM pulses? To what cause? Dead-time control has nothing to do with shaping PWM pulses. Dead-time is there to make sure that one MOSFET doesn't conduct before the other stops conducting as that would result in a shorting of both power supply rails, hence a 'delay' (dead-time) is built in to remedy that.
No shaping of the PWM pulse is going to help with that, it is an entirely different mechanism. See how confusing this marketing speak is, Lars says one thing, but probably means another and we'll all try to decipher his fancy catch phrases. Could someone please tell him that fancy wording doesn't sell products, at least not to the DIY crowd, but good performance that's well documented does 🙂
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
And why doesn't someone ask Lars some tough questions? Or are we all just interested in hearing how he came up with the cool marketing speak? And reason that someone that comes up with such fancy wording must have a good grasp of class-D engineering as well?
I have one, and I'll just come forward and utter it here. The question is as follows: why doesn't Lars step up to the plate and show us he's pushing technology forward and starts using a vacuum impregnated foil coil, rather than the 'prone to be very microphonic' loosely wound on a slitless ferrite core one that he's using now.
These are commonly used in cheap class-D car amplifiers and they're abyssmal, due to EMI issues, microphony, worst possible winding efficiency, etc. etc. Properly engineered SMPS power supplies and class-D amplifiers stay far away from such coils, so why does Lars' new module feature one?
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
I have one, and I'll just come forward and utter it here. The question is as follows: why doesn't Lars step up to the plate and show us he's pushing technology forward and starts using a vacuum impregnated foil coil, rather than the 'prone to be very microphonic' loosely wound on a slitless ferrite core one that he's using now.
These are commonly used in cheap class-D car amplifiers and they're abyssmal, due to EMI issues, microphony, worst possible winding efficiency, etc. etc. Properly engineered SMPS power supplies and class-D amplifiers stay far away from such coils, so why does Lars' new module feature one?
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
Likely it has to do with the shaping of the gate pulses.. I'm just guessing though I'm sure Lars will fill us in.
IMO it's probably not too different from the former ZapPulses...
Seismic sensor... this is what I gather:
http://www.sensorsmag.com/articles/1000/68/main.shtml
I haven't located such a device.. it is possible Lars has implemented one intrinsically to the PCB.... I don't know.
After I test post filter feedback I'll put the risc on the scope and see what triggers with overcurrent 😉
IMO it's probably not too different from the former ZapPulses...
Seismic sensor... this is what I gather:
http://www.sensorsmag.com/articles/1000/68/main.shtml
I haven't located such a device.. it is possible Lars has implemented one intrinsically to the PCB.... I don't know.
After I test post filter feedback I'll put the risc on the scope and see what triggers with overcurrent 😉
SSassen said:
Lol, I'm ready to bet, that more then 10 regular poster of this forum, can detect such BS fast and easy (and it's done), BTW, include Chris (classd4sure) too. 🙂
http://www.ewh.ieee.org/tc/sensors/...al-NewOrleans.pdf#search="saw current sensor"
page 104. I still say it has something to do with the LED/large fill planes next to it.
What say you now Lars, finally willing to answer this or do I push harder? lol
😉
page 104. I still say it has something to do with the LED/large fill planes next to it.
What say you now Lars, finally willing to answer this or do I push harder? lol
😉
I've just been informed that a certain well-known female has been caught tinkering with Lars' new modules, I guess she too has been swept off her feet with all the marketing speak and decided to put the modules to the test, by poking a screwdriver around one. Don't believe me? Here's the proof 🙂
In other news it has been rumored that Lars will be releasing special edition versions of his new modules, these will be autographed and poked with a screwdriver by Ms. Hilton herself. Think of it what you want Lars certainly did not skimp on his media budget, that's some nice exposure. Whether that's the target audience remains to be seen though
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
In other news it has been rumored that Lars will be releasing special edition versions of his new modules, these will be autographed and poked with a screwdriver by Ms. Hilton herself. Think of it what you want Lars certainly did not skimp on his media budget, that's some nice exposure. Whether that's the target audience remains to be seen though
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
Really, you mean I'm ruining this thread? Leaving the 'informative' out as there's not much information given, but for the discussion about deciphering Lars' marketing speak.
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
SSassen said:
I will better wait for Lars to answer.
Regarding your method, this will work only at very low frequencies, with the sensor placed close to the driver. The sensor can be any cheap electret microphone. Servo controlled subwoofers have this implemented in case the servo goes out of control.
But for "newclassd" there is no requirement to put the amplifier near the speaker so...
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