It is really simple: when clipping of the power amp occurs it should be the output power stage which clips; at that point it is important for the driver stage still being able to deliver a clean signal which it will when it's design and power supply voltages allow. As long as the driver stage has this headroom we deal with a healthy design.
In general for elements of your reproduction chain getting out of steam think backwards: your loudspeakers should be the first giving signs of overload (at that point your power amp should still be "clean" because a clipping amp will easily damage your loudspeakers) a.s.o. In other words: every element in your chain should have enough headroom to provide the next stage with a distortion-free signal. This is the basis of a well designed system.
That's it! NOW I get it! Thanks pieter! Like I said, I can be a little dense sometimes, but obviously, when you really think about it, some stage must fail 1st and it makes good sense to design for failure order!
I think opc wants the rest of us not in the existing GB to wait till after the original GB is completed before he allocates any of the spares that he has. My guess is there'll be a few people watching the thread closely for when they become available.
I've had a quick look through the thread but haven't seen any discussion on a lower gain variation, is this possible without too much alteration to the design? Only just opened up the schematic and datasheet a few minutes ago so still getting my head around it properly. If there is an earlier post that I've missed just tell me and I'll go digging.
Hi Guys,
Hochopeper is exactly correct, there will be about 15 boards and mosfet pairs left at the end, and I'll post them up for sale once I've shipped out everything to everyone else by the end of next week.
Payment requests will be sent out tomorrow throughout the day, so keep your eyes peeled!
As for the question about gain, it can be set a little bit lower, but the absolute lowest is can be set is 26dB. Any lower, and you could have instability problems.
If you need lower gain than that, consider a resistor divider at the input.
Cheers,
Owen
Hochopeper is exactly correct, there will be about 15 boards and mosfet pairs left at the end, and I'll post them up for sale once I've shipped out everything to everyone else by the end of next week.
Payment requests will be sent out tomorrow throughout the day, so keep your eyes peeled!
As for the question about gain, it can be set a little bit lower, but the absolute lowest is can be set is 26dB. Any lower, and you could have instability problems.
If you need lower gain than that, consider a resistor divider at the input.
Cheers,
Owen
Hi all,
-> Opc, I read your last pm, and I tried a version of the modifier DPS600. power dc = + /-60V; Driver = + /-75V regulated.
I checked the behavior with various loads, especially with a bias current = 300mA and 350mA.
I want to remind others, that it is an innovative SMPS, developed for the class AB to ensure not only the absence of noise, but also a new realism in the dynamics of sound.
As measures and photo, already published in this thread.
the weight of this psu is 420g.
Aside from the holidays I have not sent to "OPC", because the problem is that a DPS-600 can power a single amplifier (independent of power)
Reason is, that this new topology of regulator,recognize current modulation from audio amplifier in realtime. (not use large capacitors for current burst, as see on photo).
Ideal of this smps is for mono amp or dual mono in high end Mosfet Amplifier new design.
If you agree, I can send it in three days with UPS.
Regards
Roberto
-> Opc, I read your last pm, and I tried a version of the modifier DPS600. power dc = + /-60V; Driver = + /-75V regulated.
I checked the behavior with various loads, especially with a bias current = 300mA and 350mA.
I want to remind others, that it is an innovative SMPS, developed for the class AB to ensure not only the absence of noise, but also a new realism in the dynamics of sound.
As measures and photo, already published in this thread.
the weight of this psu is 420g.
Aside from the holidays I have not sent to "OPC", because the problem is that a DPS-600 can power a single amplifier (independent of power)
Reason is, that this new topology of regulator,recognize current modulation from audio amplifier in realtime. (not use large capacitors for current burst, as see on photo).
Ideal of this smps is for mono amp or dual mono in high end Mosfet Amplifier new design.
If you agree, I can send it in three days with UPS.
Regards
Roberto
Hi Roberto,
Thanks for your quick response. So if I understand correctly, you're suggesting that one supply be used per channel? If that's the case, then it should still be fine since my current test setup is only a single channel. I'm also used to listening to monoaural sources since I often build just one of each thing for testing!
If you're still interested, send the supply this way and I'll get it tested as soon as it arrives.
Regards,
Owen
Thanks for your quick response. So if I understand correctly, you're suggesting that one supply be used per channel? If that's the case, then it should still be fine since my current test setup is only a single channel. I'm also used to listening to monoaural sources since I often build just one of each thing for testing!
If you're still interested, send the supply this way and I'll get it tested as soon as it arrives.
Regards,
Owen
Hi Guys,
Please find below the updated list for all orders of The Wire AMP and Headphone amps. You will need to reference this list to complete the payment instructions I will be sending to each of you via PM this evening.
Please look over the list carefully to confirm that your order and totals are correct.
All power amplifier kits are $80 including the PCB
Each PCB is $12 by itself
Each pair of mosfets is $20 ($10 each for P and N)
Cheers,
Owen
Please find below the updated list for all orders of The Wire AMP and Headphone amps. You will need to reference this list to complete the payment instructions I will be sending to each of you via PM this evening.
Please look over the list carefully to confirm that your order and totals are correct.
All power amplifier kits are $80 including the PCB
Each PCB is $12 by itself
Each pair of mosfets is $20 ($10 each for P and N)
Cheers,
Owen
Payment sent!
Thanks for all the hard work Owen. :beer:
Sent from my Sony Tablet S using Tapatalk
Thanks for all the hard work Owen. :beer:
Sent from my Sony Tablet S using Tapatalk
Dear Owen
Payment (cad 1042.69) sent
Please check email , with the order and delivery details
Thanks
Payment (cad 1042.69) sent
Please check email , with the order and delivery details
Thanks
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so does this new SMPS topology do a similar thing to what the aleph current source does?
BTW Owen, i've ordered your lemos so its all in motion
BTW Owen, i've ordered your lemos so its all in motion
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Hi Guys,
AndrewT brought to my attention that the link to Canada Post I sent with the payment instructions is not working. I guess they change the link every now and then, as it was working in December.
Here's the correct link:
http://www.canadapost.ca/cpotools/apps/far/personal/findARate?execution=e1s1
Most of you have sorted this out anyhow, but I just wanted to make it clear.
Several payments have already come in, and I really appreciate everyone's promptness and accuracy with this. You guys are awesome 🙂
Cheers,
Owen
AndrewT brought to my attention that the link to Canada Post I sent with the payment instructions is not working. I guess they change the link every now and then, as it was working in December.
Here's the correct link:
http://www.canadapost.ca/cpotools/apps/far/personal/findARate?execution=e1s1
Most of you have sorted this out anyhow, but I just wanted to make it clear.
Several payments have already come in, and I really appreciate everyone's promptness and accuracy with this. You guys are awesome 🙂
Cheers,
Owen
Happy new Year !!!
Sorry for being late or if i missed something important. I had to take a long break due to some health issues and when i resumed the work, there were too many things left behind to recover.
I made a prototype for the power supply about 2 months ago, and i almost finished, hopefully in the weekend i can make some tests and show you some results. this first version has PFC, quasi-resonant unregulated DC-DC converter, as for the specs discussed about 2-3 months ago. If the requirements had changed and there will be some interest, i can consider a new design with regulated output voltages and possible linear regulators for IC supply, as well as LC filters for minimum output ripple and noise.
Sorry for being late or if i missed something important. I had to take a long break due to some health issues and when i resumed the work, there were too many things left behind to recover.
I made a prototype for the power supply about 2 months ago, and i almost finished, hopefully in the weekend i can make some tests and show you some results. this first version has PFC, quasi-resonant unregulated DC-DC converter, as for the specs discussed about 2-3 months ago. If the requirements had changed and there will be some interest, i can consider a new design with regulated output voltages and possible linear regulators for IC supply, as well as LC filters for minimum output ripple and noise.
Hi Cristi,
I would still be interested in testing one if you want to send one this way. I can always ship it back to you when I'm done, or I can pay you for it and keep it if it works well 🙂
Send me a PM and we can make arrangements.
Regards,
Owen
I would still be interested in testing one if you want to send one this way. I can always ship it back to you when I'm done, or I can pay you for it and keep it if it works well 🙂
Send me a PM and we can make arrangements.
Regards,
Owen
I must admit however that the spec of the one cristi mentioned a few months ago, seems somewhat lacking compared to AR2's unit; the possibility of more easily regulating the main outputs than is possible with linear was the main thing apart from physical size that had me considering a switcher in the first place. perhaps cristi can come up with one to match, but do we really have the time to start specifying something now when AR2 has one on the table? how many people will be interested enough to wait? i'm just a little concerned at work being put into a redesign; particularly since you havent been well. I thought we had mentioned at the time back then that a regulated psu for the main outputs was desirable? i remember being surprised it wasnt...
I do sympathise with your predicament regarding health issues cristi, but i dont know how many people will be waiting around for a redesign at this stage...guys?. of course given the need for one psu per channel for AR2's unit price will factor into it for multi channel designs. should we get a show of hands here again? i'm at the point that i'll probably grab the highest spec unit or just stick with linear, the promise of higher performance is a larger draw for me than smaller size.
I do sympathise with your predicament regarding health issues cristi, but i dont know how many people will be waiting around for a redesign at this stage...guys?. of course given the need for one psu per channel for AR2's unit price will factor into it for multi channel designs. should we get a show of hands here again? i'm at the point that i'll probably grab the highest spec unit or just stick with linear, the promise of higher performance is a larger draw for me than smaller size.
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I am sticking with Linear PSU.
It's a technology that most of us know and most of us can debug.
I am not interested in a new technology that needs experimentation and development. That is known to a few and cannot be debugged by the general DIYer.
It could next year, or next decade, or tomorrow, that the switchers will always be better performers than any really good Linear. But, not today !!!
It's a technology that most of us know and most of us can debug.
I am not interested in a new technology that needs experimentation and development. That is known to a few and cannot be debugged by the general DIYer.
It could next year, or next decade, or tomorrow, that the switchers will always be better performers than any really good Linear. But, not today !!!