UCD180 questions

[Jan-Peter]

FuriousD,

Hereby a FFT of 7.2kHz at 20Vrms in 8 Ohm load, of the UcD180.
I am sorry I can't give info about OEM customers they will not appreciate this. But when the amps are ready we can show you some details about the product.

Gertjan,

The difference between direct measurement of the UcD modulator and with a NE5532 is none. The first measurements showed with the NE5532 it was even better, but this was a measurement direclty after switched. So measurement with or without the capacitors, I do not get any difference in measurements.

As far as I know there are a lot of things to hear buy we can't measure. Becuase of this a lot of tech guys don't believe in listening to electronic components. I was one them, but I have now to admit that there are more things what you can hear but can not measure. Perhaps somebody can jump in and give some other theoratical info.

Reagrds,

Jan-Peter

www.hypex.nl

[ghemink]

Originally posted by xman737
Hi Jan-Peter,
I have received your reply. Thanks! I will wait until your on-line ordering system is ready and perform some study on this website in the meantime.
Hi ghemink and classd4sure,
Thanks for your help! Would you please post some photo about your project and let beginner like me can easy to understand how to set up the module.
Regards! xman

Maybe it is better to wait until HYPEX also can supply power supplies and cables/connectors. That should make it easy.

I can post a picture of my test setup late when I`m at home tonight.

Best regards

Gertjan

[ghemink]

Originally posted by Jan-Peter
FuriousD,

Hereby a FFT of 7.2kHz at 20Vrms in 8 Ohm load, of the UcD180.
I am sorry I can't give info about OEM customers they will not appreciate this. But when the amps are ready we can show you some details about the product.

Gertjan,

The difference between direct measurement of the UcD modulator and with a NE5532 is none. The first measurements showed with the NE5532 it was even better, but this was a measurement direclty after switched. So measurement with or without the capacitors, I do not get any difference in measurements.

As far as I know there are a lot of things to hear buy we can't measure. Becuase of this a lot of tech guys don't believe in listening to electronic components. I was one them, but I have now to admit that there are more things what you can hear but can not measure. Perhaps somebody can jump in and give some other theoratical info.

Reagrds,

Jan-Peter

www.hypex.nl

Hi Jan-Peter,

I`m also an electrical engineer and in general I used not to believe in things that we can not measure but that we can only hear, are we really hearing the difference or are we thinking that we hear a difference because we should since we changed something. However, I have to admit, many things you would expect to be not significant from an engineering point of view can make audible differences. I do not have sophisticated test equipment at home, so I can not measure that much anyway. Still I think measurements are very valuable. If we hear something that we can`t measure then I think the problem is in the measurements method. We should then find the right parameter to measure.

Anyway, enough philosophy for now. I`ll just try it sometime. Just good to know that the FFT results do not show any differences.

Best regards

Gertjan

[xman737]

Hi ghemink,
Thanks! Looking forward to your pictures.

[ghemink]

Originally posted by xman737
Hi ghemink,
Thanks! Looking forward to your pictures.

Hi xman737,

Here are two pictures taken from two different angles. The whole setup is still very experimental as you can see and this is sure not the final setup.

The first picture shows the view from the power supply side. I used a 250W transformer that gives about 2x32V AC output voltage. I ordered it at partsexpress in the US, the transformer should give 2x35V but in Japan the line voltage is only 100V while it is 115V in the US so I get a few volts less. The small PCB at the right of the transformer is a softstart module (from LCaudio), this module puts a series resistor in between the power supply and the transformer during start up and shorts the resistor after a few seconds. As a result, the peak currents for charging the power supply caps is reduced. Then just behind the transformer is the PCB with the diode bridge rectifiers and power supply caps of 10.000uF each. This gives me about 42V DC after rectification. This module is also from LCaudio, it is the Predator power supply that was designed to be used with the LCaudio ZAPpulse modules. It works perfect for the UCD180 as well. In the back are two UCD180 modules.

In the other picture (in the next post), you can see the two UCD180 modules from the other side. As you can see, I have soldered all wires directly to the connectors or to the PCB (power supply). I did this because I did not have the connectors and I prefer soldering above having connectors. I realize that I may not be able to return the modules in case of any trouble with them, however, I took that risk. I have used WBT RCA connectors and speaker binding posts, but I`ll be using XLR connectors in the final version. In the final version I`ll probably add a few more 10.000uF capacitors in the power supply.

Best regards

Gertjan

[ghemink]

Originally posted by ghemink



Hi xman737,

Here are two pictures taken from two different angles. The whole setup is still very experimental as you can see and this is sure not the final setup.

The first picture shows the view from the power supply side. I used a 250W transformer that gives about 2x32V AC output voltage. I ordered it at partsexpress in the US, the transformer should give 2x35V but in Japan the line voltage is only 100V while it is 115V in the US so I get a few volts less. The small PCB at the right of the transformer is a softstart module (from LCaudio), this module puts a series resistor in between the power supply and the transformer during start up and shorts the resistor after a few seconds. As a result, the peak currents for charging the power supply caps is reduced. Then just behind the transformer is the PCB with the diode bridge rectifiers and power supply caps of 10.000uF each. This gives me about 42V DC after rectification. This module is also from LCaudio, it is the Predator power supply that was designed to be used with the LCaudio ZAPpulse modules. It works perfect for the UCD180 as well. In the back are two UCD180 modules.

In the other picture (in the next post), you can see the two UCD180 modules from the other side. As you can see, I have soldered all wires directly to the connectors or to the PCB (power supply). I did this because I did not have the connectors and I prefer soldering above having connectors. I realize that I may not be able to return the modules in case of any trouble with them, however, I took that risk. I have used WBT RCA connectors and speaker binding posts, but I`ll be using XLR connectors in the final version. In the final version I`ll probably add a few more 10.000uF capacitors in the power supply.

Best regards

Gertjan

And here is the second picture

[xman737]

Hi, ghemink,
Thanks a lot! Very impressive setting and very clear introduction. I think I know how to set it up right now. I wish you can complete your active loundspeaker project early and share us your expirence. Thanks again!

[ghemink]

Originally posted by xman737
Hi, ghemink,
Thanks a lot! Very impressive setting and very clear introduction. I think I know how to set it up right now. I wish you can complete your active loundspeaker project early and share us your expirence. Thanks again!

Hi xman,

You are welcome. Building the active system takes time, progressing slowly. The speakers are almost ready (not yet in child-proof version so I set them up only at night in the living room), amps will take still a bit more time but I can listen to the speakers with my Marantz amp (4 channel Tripath) so I`m not without music all the time :-). They sound better than my passive B&W CDM9NT so I don`t really want to listen to those speakers anymore since my half finished 3-way really sounds quite a bit better.

Good luck with your project.

Best regards

Gertjan

[IVX]

Hi all!
Jan-Peter, about 7.2k..
my experiments had the floating balance between 2nd and 3nd harmonics, which was changing by the changing loop components, however THD was kept (almost). Would be the even/odd balance different from sample to sample of UcD180 due to the tolerance worst case, with still around 0.013% THD?


PS:..Looking forward FuriousD analyse for your plot...

[Jan-Peter]

Ivan,

We never tested a batch of the UcD180 with this FFT analyze. It's indeed a good idee to test a batch.

What do you mean with;

my experiments had the floating balance between 2nd and 3nd harmonics

Regards,

Jan-Peter

www.hypex.nl