UCD180 questions - Page 22

Bruno Putzeys · 25th August 2004, 10:01 AM

Quote:

Originally posted by FuriousD
Also, as a quick aside, your own CD player design has been mentioned, a one bit D2A. I'd be interested to hear your thoughts on output modulator design and more importantly, the effect of noise shaping order and oversampling rate on the sound quality. It's of particular interest to me at the moment.

Can we discuss this over e-mail?

Jan-Peter · 25th August 2004, 10:09 AM

Peranders,

It's indeed an idee to use the AD8620. For OEM manufactures we can always make a special version, however this is only possible in bigger orderquantities.

It also a very good idee for a review by the Danis/Swedish Hifi magazines. I don't have any contact in that area.

Perhaps we better have a private email contact about this.

Regards,

Jan-Peter

www.hypex.nl

phase_accurate · 25th August 2004, 10:12 AM

A PWM amp I developed about 15 years ago sounded very nice, transparent and by no means harsh, despite having around 0.5% THD.
The two main advantages class-d amps have over most linear amps:

1.) No crossover distortion (this is a little exagerated but soemtimes you have to

)

2.) Capability of driving complex loads with ease (they don't have to be specifically designed for this they "just do it").

Regards

Charles

peranders · 25th August 2004, 10:12 AM

Quote:

Originally posted by Jan-Peter
It also a very good idee for a review by the Danis/Swedish Hifi magazines. I don't have any contact in that area.

They are nice blokes so just get in contact with them

The magazine has also the right attitude for your products. They are towards high-end equipment.

http://hifi.dk

I'll guess you can get in contact with Thomas Madsen which has written for them.

FuriousD · 25th August 2004, 10:51 AM

Bruno,

I have temporarily enable my email address on my profile to enable you to email me. I'll disable it once you've contacted me.

F.

peranders · 25th August 2004, 11:40 AM

Furious, there is no risk with having your address enabled because you won't get it revealed, only if you answer the email. If you get to much unwanted email this just disable it!

matjans · 25th August 2004, 08:05 PM

and while you;re at it (jan peter), you might want to read this thread on biasing opamps in to class a.

I;ve sent you an email, btw. Next week i;ll be working near groningen (haren) so i was wondering whether it;d be possible to pick 2 ucd180;s up at your factory (which saves me shipping costs).

classd4sure · 25th August 2004, 08:10 PM

Quote:

Originally posted by matjans
and while you;re at it (jan peter), you might want to read this thread on biasing opamps in to class a.

I;ve sent you an email, btw. Next week i;ll be working near groningen (haren) so i was wondering whether it;d be possible to pick 2 ucd180;s up at your factory (which saves me shipping costs).

Should be nothing stopping you from making that mod yourself, not everyone seems to like it, and it would run hotter/less reliably. Could be something to try though.

Jan-Peter · 25th August 2004, 08:12 PM

Matjans,

I have just answerd you private email, see you next week

This is a very known tweak using a resistor to put the amp in Class-A. You could also consider a J-fet........

Regards,

Jan-Peter

www.hypex.nl

matjans · 25th August 2004, 08:25 PM

<marketing-bs-mode>
Ultra High End Class A buffered Class D Amplifier
</marketing-bs-mode>

haha!

thanks, JP. See you.

25th August 2004, 11:40 AM	#216
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Furious, there is no risk with having your address enabled because you won't get it revealed, only if you answer the email. If you get to much unwanted email this just disable it! __________________ /Per-Anders (my first name) or P-A as my friends call me

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25th August 2004, 10:09 AM	#212
Jan-Peter diyAudio Member Join Date: Sep 2003 Location: -	Peranders, It's indeed an idee to use the AD8620. For OEM manufactures we can always make a special version, however this is only possible in bigger orderquantities. It also a very good idee for a review by the Danis/Swedish Hifi magazines. I don't have any contact in that area. Perhaps we better have a private email contact about this. Regards, Jan-Peter www.hypex.nl

25th August 2004, 10:12 AM	#213
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	A PWM amp I developed about 15 years ago sounded very nice, transparent and by no means harsh, despite having around 0.5% THD. The two main advantages class-d amps have over most linear amps: 1.) No crossover distortion (this is a little exagerated but soemtimes you have to ) 2.) Capability of driving complex loads with ease (they don't have to be specifically designed for this they "just do it"). Regards Charles

25th August 2004, 10:51 AM	#215
FuriousD diyAudio Member Join Date: Jun 2004 Location: UK	Bruno, I have temporarily enable my email address on my profile to enable you to email me. I'll disable it once you've contacted me. F.

25th August 2004, 08:05 PM	#217
matjans diyAudio Member Join Date: Aug 2003 Location: Utrecht, NL	and while you;re at it (jan peter), you might want to read this thread on biasing opamps in to class a. I;ve sent you an email, btw. Next week i;ll be working near groningen (haren) so i was wondering whether it;d be possible to pick 2 ucd180;s up at your factory (which saves me shipping costs).

25th August 2004, 08:12 PM	#219
Jan-Peter diyAudio Member Join Date: Sep 2003 Location: -	Matjans, I have just answerd you private email, see you next week This is a very known tweak using a resistor to put the amp in Class-A. You could also consider a J-fet........ Regards, Jan-Peter www.hypex.nl

25th August 2004, 08:25 PM	#220
matjans diyAudio Member Join Date: Aug 2003 Location: Utrecht, NL	<marketing-bs-mode> Ultra High End Class A buffered Class D Amplifier </marketing-bs-mode> haha! thanks, JP. See you.

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