UCD180 questions

[classd4sure]

Hi,

About the blue colour:...

I've no doubt you're right, we're talking about percentages of pennies, but you gotta draw the line somewhere. So I decided to post that before we start talking about gold solder joints and the like. My priorities aren't cosmetics.

I still can't help but wonder how much less they'd be for just a plain jane heatsink though. How about that blue LED? They're a fair bit more costly than a regular red or green one too. Could always upgrade that to lazer that spells out UCD on the ceiling..track titles and running time, oscillation frequency, THD and FFT. There's a good reason for building a clear case, otherwise the most you can do is say look, it's blue.

Was it the tact millenium, all the reviewers were ranting about how good that gold plated volume knob looked, I wonder how many of them cut a check for one.

Anyway, for now we're still talking pennies, won't stop me from getting one.

ghemink, looking forward to your testing results. I trust that posted protection circuitry is already included in your module? I haven't studied it much either but I guess that's also your short circuit protection.

[Jan-Peter]

Hi,

The price increase a few Euros (dollars) because of the blue colour. I think it's nice to receive somthings what not only functions ok but also looks ok.

IVX,

Indeed we will come with more powerfull UcDs. First will be introduced the 400W version, after that we will come with a 700 - 1000W version. A super UcD High End version is currently unther development by Bruno. But this is somewhat secret OEM project so we can't share you with more information.

Regards,

Jan-Peter

www.hypex.nl

[classd4sure]

Indeed we will come with more powerfull UcDs. First will be introduced the 400W version, after that we will come with a 700 - 1000W version. A super UcD High End version is currently unther development by Bruno. But this is somewhat secret OEM project so we can't share you with more information.

Very, very nice!

Are you as of yet able to give anymore information about your 400 watt version? How will it differ from the 180w? We know it has a different driver, possibly second integrator loop, is it full bridge, does it use the same input stage and comparator? Can you comment on the performance of it into a 4 ohm load?

Thanks,
Chris

[Jan-Peter]

Chris,

The difference of the UcD400 with the UcD180 is not so much. Only more powerfull Fets and output coil. It's still no Full-Bridge ;-)

We use the same Modulator PCB!

A measurement in 4 Ohm at 1kHz.

Regards,

Jan-Peter


www.hypex.nl

[classd4sure]

Hi Jan,

Looks good, thank you.

[FuriousD]

Hi Bruno / Jan-Peter

Any chance of you showing the 7.2kHz FFT of THD + noise for the UCD180 that John W showed for his amp on one of the other threads. I believe that it was about 100Watts into 4 Ohms.

This would be much more useful than another meaningless THD_N vs frequency plot which tells you nothing at all!

Or alternatively, an AP FFT plot of the UCD180 doing 19&20kHz @ 100W into 4Ohms. These would tell a much more useful story about the performance of the amplifier.

FuriousD

[ghemink]

Originally posted by Jan-Peter
Hi,

The price increase a few Euros (dollars) because of the blue colour. I think it's nice to receive somthings what not only functions ok but also looks ok.

IVX,

Indeed we will come with more powerfull UcDs. First will be introduced the 400W version, after that we will come with a 700 - 1000W version. A super UcD High End version is currently unther development by Bruno. But this is somewhat secret OEM project so we can't share you with more information.

Regards,

Jan-Peter

www.hypex.nl

Hi Jan-Peter,

Will that super UCD high end version become available for us as well? If we know something better is out there we may want to have it.

When can we expect that 700-1000W version? I need brute force for my dipole woofers. Probably I could also blow the main fuses in my house with that kind of power. Here in Japan we have only 100V available. :-(

Best regards

Gertjan

[ghemink]

Originally posted by Jan-Peter
Hello,

I promised a schematic for an overvoltage protection. Please look to attachment. This design is only for DIY, not for manufactures. Copyrights are by Hypex Electronics BV.

Regards,

Jan-Peter

www.hypex.nl

Hi Jan-Peter,

When comparing the schematics of input.gif that you posted earlier with this one, it seems I only have to add the lower part. The part with the two zener diodes, two transistors and a couple of resistors. The the u-prot signal can just go to the u-prot signal of the UCD module. Correct?

Best regards

Gertjan

[IVX]

THD_N vs frequency plot which tells you nothing at all!

Hmm, but why exactly 7.2Khz is more informative???
Edited:
BTW, if i remember correctly, for my UcD_like(not optimal implementation) amp THD~=IMD.

[FuriousD]

Hmm, but why exactly 7.2Khz is more informative???

7.2kHz would give you second and third harmonic within the measurement bandwidth of the FFT of an Audio P system one or better. (about 22kHz for the system one, and about 24kHz for the system two) and also gives you two harmonics within the audio band!
This gives you even and odd harmonics. Since different feedback systems usually result in very different harmonic perfomances for odd and even, and these usually become worse with frequency, this is the most extreme single frequency FFT test that most designers can do to their amplifier. It is extremely revealing!

It gives a good indication of noise floor (something that the THD_N plot does not).

It is so infuriating to see THD+N plots as you could have fantastic THD in the amplifier, and the designer could be the worst PSU designer in the world and the THD+N plot would rate the amplifier as bad. The THD+N does not tell you anything meaningful at all. I do not know why people bother to show them.

D.