DC offset of -22.7V on one UcD180HG
Hi,
I finally got my new UcD400HGs and UcD180HGs to place in my two 3-ch enclosures, replacing the non-HG modules.
I have -22.7V DC offset on one UcD180HG with regulators (am I glad I checked!!).
Can this be adjusted with the pot or is it defective?
Power supply is +45V and -45V. Offset is not present when amp is disabled.
My 3 other UcD180HG with regs have between 3mV and 44mV offset, I might adjust them although it is not needed.
My 2 UcD400HG have almost no offset (no regs).
Other thought: the diodes on the regulators stay lit (good for Christmas) even when the UcD180HG is disabled (leaving the on wire floating). I wonder if this will consume much power since I will normally leave them powered but disabled.
Guy
Hi,
I finally got my new UcD400HGs and UcD180HGs to place in my two 3-ch enclosures, replacing the non-HG modules.
I have -22.7V DC offset on one UcD180HG with regulators (am I glad I checked!!).
Can this be adjusted with the pot or is it defective?
Power supply is +45V and -45V. Offset is not present when amp is disabled.
My 3 other UcD180HG with regs have between 3mV and 44mV offset, I might adjust them although it is not needed.
My 2 UcD400HG have almost no offset (no regs).
Other thought: the diodes on the regulators stay lit (good for Christmas) even when the UcD180HG is disabled (leaving the on wire floating). I wonder if this will consume much power since I will normally leave them powered but disabled.
Guy
Re: DC offset of -22.7V on one UcD180HG
Have you checked to make sure all of the supply voltages (the main supply and the regulator outputs) are correct? Was anything connected to the input of the "bad" module when you measured the offset?
guyv said:
Have you checked to make sure all of the supply voltages (the main supply and the regulator outputs) are correct? Was anything connected to the input of the "bad" module when you measured the offset?
Re: Re: DC offset of -22.7V on one UcD180HG
As I stated the main supply is OK. I am not sure what you mean about the regulator outputs. The regulators are from Hypex and are soldered on the board (they arrived already installed). Are you suggesting the regulators may be defective and I could check this by measuring some test points on the PCB?
Guy
BWRX said:
As I stated the main supply is OK. I am not sure what you mean about the regulator outputs. The regulators are from Hypex and are soldered on the board (they arrived already installed). Are you suggesting the regulators may be defective and I could check this by measuring some test points on the PCB?
Guy
Re: Re: Re: DC offset of -22.7V on one UcD180HG
Hi Guy. It's very hard to say what could be wrong, but yes a regulator failure is possible. Are the new version of these modules DC coupled?
guyv said:
Hi Guy. It's very hard to say what could be wrong, but yes a regulator failure is possible. Are the new version of these modules DC coupled?
Re: Re: Re: Re: DC offset of -22.7V on one UcD180HG
No they are not DC coupled but the caps are now before the op-amp. After everything is working right I will probably DC-couple them since I saw feedback stating that it still makes a big difference and Jan-Peter concurs that it is definitly a good tweak on the HG.
Guy
BWRX said:
No they are not DC coupled but the caps are now before the op-amp. After everything is working right I will probably DC-couple them since I saw feedback stating that it still makes a big difference and Jan-Peter concurs that it is definitly a good tweak on the HG.
Guy
Re: DC offset of -22.7V on one UcD180HG
I see a cracked surface mount transistor at T22. So I now assume that is the reason of the problem.
It seems that the cutter caught it when the legs of the regulator were trimmed (they were installed on a V2 UcD180HG but not by me).
Guy
I see a cracked surface mount transistor at T22. So I now assume that is the reason of the problem.
It seems that the cutter caught it when the legs of the regulator were trimmed (they were installed on a V2 UcD180HG but not by me).
Guy
If you had to run a stereo power amp with 2 of these modules with a passive preamp (just an alps volume pot) wich value would you use for the potentiometer? What about a 50Kx2 Alps blue one?
Supply input buffer from a hg supply
Hi
Im running my ucd180 modul, and wonder if i can improve the sound even more.
Of course i can bye the HxR regulators, but my ucd modules are Ver.1.0 so it feels not så easy to take the amp apart and sending the modules away.
But is it possible to use the Auxilary supply from my HG powersupply as it shows i application note ?http://www.hypex.nl/docs/UcD180AUX.pdf
As i can understand, the instruction are made for the SD version.
Anyone?? 😕
Hi
Im running my ucd180 modul, and wonder if i can improve the sound even more.
Of course i can bye the HxR regulators, but my ucd modules are Ver.1.0 so it feels not så easy to take the amp apart and sending the modules away.
But is it possible to use the Auxilary supply from my HG powersupply as it shows i application note ?http://www.hypex.nl/docs/UcD180AUX.pdf
As i can understand, the instruction are made for the SD version.
Anyone?? 😕
Hi UCD180 fans,
I'm considering building an installation PA amp using the UCD180, cause it's cheap, has good performance, and does not heat up. Goal is to replace the poor installation amp at my local church.
This would mean adding a 100V output transformer at the UCD's output, for example the LM18 (4 ohms) from Sowter Transformers Ltd. Needless to say, the 100V speaker cables are just plain electrical cables, running along the church beside various 220V lightning cables (and the organ supply!) I'm even wondering if they don't get through the main electrical dispatch board.
Is putting a 100V output transformer to a Class-D amp possible or just stupid?
What about the high frequency radiations? EMI??
Did anyone experiment such a setup yet???
I'm considering building an installation PA amp using the UCD180, cause it's cheap, has good performance, and does not heat up. Goal is to replace the poor installation amp at my local church.
This would mean adding a 100V output transformer at the UCD's output, for example the LM18 (4 ohms) from Sowter Transformers Ltd. Needless to say, the 100V speaker cables are just plain electrical cables, running along the church beside various 220V lightning cables (and the organ supply!) I'm even wondering if they don't get through the main electrical dispatch board.
Is putting a 100V output transformer to a Class-D amp possible or just stupid?
What about the high frequency radiations? EMI??
Did anyone experiment such a setup yet???
I use UCD180's with 100 volt line transformers, for distributed public address use, and have had no problems.
Obviously there is a small (very small!) HF residue on the outputs, but I've had no reports or experiences of this causing any problems at all.
Go for it - they're great amps, IMHO.
Obviously there is a small (very small!) HF residue on the outputs, but I've had no reports or experiences of this causing any problems at all.
Go for it - they're great amps, IMHO.
Clipping and DC protection
Thanks rogs!
I got a further question. Actually two.
I originally thought about adding a DC-protection (Rod Elliot's Project 33) at the output. Since DC can be adjusted on the UCD180HG, I guess it makes no sense. Is it right? (I'll leave the input caps, as I cannot guarantee the input will be clean...)
I would also like to add a clip detection (Rod Elliot's Project 23), since the amp may be handled by rude people (rude towards electronics, of course). How close may the output get to the power supply rails (at how many volts under Vin does the amp clip)?
Quick maths: 180 W in 4 Ohms with 45 V supply, that is should be 37.5 V peak, thus nearly 8 V away from the supply rail. Is it correct? If I have only 41 V supply (30 V rated transformer), is it still the same 8 V?
Thanks rogs!
I got a further question. Actually two.
I originally thought about adding a DC-protection (Rod Elliot's Project 33) at the output. Since DC can be adjusted on the UCD180HG, I guess it makes no sense. Is it right? (I'll leave the input caps, as I cannot guarantee the input will be clean...)
I would also like to add a clip detection (Rod Elliot's Project 23), since the amp may be handled by rude people (rude towards electronics, of course). How close may the output get to the power supply rails (at how many volts under Vin does the amp clip)?
Quick maths: 180 W in 4 Ohms with 45 V supply, that is should be 37.5 V peak, thus nearly 8 V away from the supply rail. Is it correct? If I have only 41 V supply (30 V rated transformer), is it still the same 8 V?
If you're using the amp for just PA (i.e. no music with heavy bass!)
then I shouldn't worry too much about clipping.
Bearing in mind that even 'continuous' spoken word has a duty cycle of about 10 -12% at most, then the power supply is not that critical.
Even severe clipping doesn't affect the intelligibility of speech very much, as discovered over 60 years ago, so the odd 'peak' shouldn't present much of a problem.
The other thing you might like to consider is a cheaper output transformer. Sowter do, of course, make excellent transformers, but for speech only the one you mentioned is probably a bit over specified - and a bit pricy.
For 100 watts of loudspeaker load, you'd probably find that 60 -75 Watt transformer would be fine for speech PA - try a mains toroid with a 115Volt primary , and a 15 to 18 volt secondary, but wired backwardss (i.e. as a step up transformer). Works pretty well!
As for DC protection -- you're not going to destroy any loudspeakers, which is usually the reason for including it, as the amp output is going to be transformer isolated.
Now whether the transformer winding gives up the ghost before the supply fuse go........ depends how much the transformer is worth I guess!!
then I shouldn't worry too much about clipping.
Bearing in mind that even 'continuous' spoken word has a duty cycle of about 10 -12% at most, then the power supply is not that critical.
Even severe clipping doesn't affect the intelligibility of speech very much, as discovered over 60 years ago, so the odd 'peak' shouldn't present much of a problem.
The other thing you might like to consider is a cheaper output transformer. Sowter do, of course, make excellent transformers, but for speech only the one you mentioned is probably a bit over specified - and a bit pricy.
For 100 watts of loudspeaker load, you'd probably find that 60 -75 Watt transformer would be fine for speech PA - try a mains toroid with a 115Volt primary , and a 15 to 18 volt secondary, but wired backwardss (i.e. as a step up transformer). Works pretty well!
As for DC protection -- you're not going to destroy any loudspeakers, which is usually the reason for including it, as the amp output is going to be transformer isolated.
Now whether the transformer winding gives up the ghost before the supply fuse go........ depends how much the transformer is worth I guess!!
Hi folks.
Apologize if below questions are duplicate questions.
I couldn't find the time to read all the 2000+ earlier posts.
I just ordered a pair of 180HG with HxR.
I m currently running a highly modded battery driven Tripath 2020 on 98db SPL speakers, which has to challenge the UCDs.
My woofers are driven with Icepower 1000ASP - which also might change in the neear future. 😉
My question: I got my DAC directly coupled to the AMP. I further control the volume via PC ( up to -12db. In average -6b on my prefered
CDs). This setup works best with an amp gain of approx. 10 in my chain.
What is the minimum voltage gain I can configure with the UCD?
How can I do it?
I'd like to run the UCD with +-45V fired with the new CPS80 (DC/DC) from coldamp. Does anybody has experience with these
PS? The coldamp also comes with a +-12V auxillary supply? Do I still need it with the new regulated UCD modules?
Cheers
Klaus
Apologize if below questions are duplicate questions.
I couldn't find the time to read all the 2000+ earlier posts.
I just ordered a pair of 180HG with HxR.
I m currently running a highly modded battery driven Tripath 2020 on 98db SPL speakers, which has to challenge the UCDs.
My woofers are driven with Icepower 1000ASP - which also might change in the neear future. 😉
My question: I got my DAC directly coupled to the AMP. I further control the volume via PC ( up to -12db. In average -6b on my prefered
CDs). This setup works best with an amp gain of approx. 10 in my chain.
What is the minimum voltage gain I can configure with the UCD?
How can I do it?
I'd like to run the UCD with +-45V fired with the new CPS80 (DC/DC) from coldamp. Does anybody has experience with these
PS? The coldamp also comes with a +-12V auxillary supply? Do I still need it with the new regulated UCD modules?
Cheers
Klaus
Hello, I read somewhere that you can actually decrease the UCD gain by removing an SMD resistor on the circuit. Which one, I don't remember but someone might give you the answer.
Hello, You can find a paper on the subject of gain altering of the UCD modules on the website of the maker of this modules.
www.hypex.nl
www.hypex.nl
Hi.
Bothering you again, even though I still don't have the
UCDs at home:
The gain note you can find here:
http://www.hypex.nl/docs/gainappnote.pdf
Question:
1.
What happens if I run a non-differential input - putting hot- to ground? Wouldn't that change the behaviour resp. the gain-formular?
2.
What would happen to the coupling cap dimensioning when
changing the input impedance? Lowering the resistor would probably mean a higher cut-off frequency for the input filter - please correct me if I am wrong here! How would the dimensioning of the cap work here?
3. Are there any specific resistors you'd recomend as replacement for the stock resistors.
THX
Bothering you again, even though I still don't have the
UCDs at home:
The gain note you can find here:
http://www.hypex.nl/docs/gainappnote.pdf
Question:
1.
What happens if I run a non-differential input - putting hot- to ground? Wouldn't that change the behaviour resp. the gain-formular?
2.
What would happen to the coupling cap dimensioning when
changing the input impedance? Lowering the resistor would probably mean a higher cut-off frequency for the input filter - please correct me if I am wrong here! How would the dimensioning of the cap work here?
3. Are there any specific resistors you'd recomend as replacement for the stock resistors.
THX
Hello,
today I just got two UCD180HG with HXR, and they look very nice. Great work of HYPEX!! Now I have two questions to Jan-Peter, Bruno or someone who can answer it:
1. the HXR Regulators are spezified for +/- 40V Inputvoltage. Do they work fine even with +/- 45 Volts?
2. If I wait for the new Hypex SMPS, should I use the +/- 12V AUX Power of the SMPS and how to connect that, or would it be better to use the HXR-regulators?
I am looking forward to build my new amp for my Klipsch Cornerhorn Clones. Until now I used Tripath (modded Sonic Impact) and hope that the UCD180 will outperform my Tripath-Amp.
Regards
hansherbert
today I just got two UCD180HG with HXR, and they look very nice. Great work of HYPEX!! Now I have two questions to Jan-Peter, Bruno or someone who can answer it:
1. the HXR Regulators are spezified for +/- 40V Inputvoltage. Do they work fine even with +/- 45 Volts?
2. If I wait for the new Hypex SMPS, should I use the +/- 12V AUX Power of the SMPS and how to connect that, or would it be better to use the HXR-regulators?
I am looking forward to build my new amp for my Klipsch Cornerhorn Clones. Until now I used Tripath (modded Sonic Impact) and hope that the UCD180 will outperform my Tripath-Amp.
Regards
hansherbert