Since no one explained in layman terms, I will try.
What Jan-Peter indicated is that, instead of disconnecting the output from the speaker terminals, he does recomend disconnecting the power source from the amplifier modules if DC is detected on the output. You can use any of the usual DC detection circuits, like the one that ESP offers, and the adapt the power output so it activates relays that disconnect the power source off the amplifiers and keep it disconnected until someone unplugs the power source.
Am I right in my understanding?
Allan
What Jan-Peter indicated is that, instead of disconnecting the output from the speaker terminals, he does recomend disconnecting the power source from the amplifier modules if DC is detected on the output. You can use any of the usual DC detection circuits, like the one that ESP offers, and the adapt the power output so it activates relays that disconnect the power source off the amplifiers and keep it disconnected until someone unplugs the power source.
Am I right in my understanding?
Allan
yeah, but there's still other ways you can go about it too, look a little further back than the secondaries.
Primaries? A lot op electrolytics after that....
edit:
I think I read your post the wrong way
sorry...
edit:
I think I read your post the wrong way
sorry...
Hypex parts in a UcD400 stereo amp?
Use all Hypex parts in a UcD stereo amp?
I want to build a UcD400 stereo amp. I am not an electronics designer, but have soldering and mechanical skills. Much of the gory details you guys discuss here is not my forte, but I am learning more each day.
Instead of learning all that stuff cold before I even begin building, I am thinking about buying all the pre made components from Hypex. Seems to me they will have tested it all together and it should make the amps perform just fine. I will be running these amps with Legacy Focus 20/20 speakers which are low impedence, with 3x12" woofs, 2x7" mids, +dome and ribbon tweets. They love power, up to 500wpc. They are 95dB sensitive and play very loudly with a 50wpc stereo tube amp. I listen at moderate levels, never beyond realistic levels.
I will probably use similar pre-built components in a DIY preamp, probably DACT CT-101/CT-2 for starters, powering CT-101 with the Hypex power supply HG which has 12V out.
Some questions I have are :
Hypex sells a single 500VA toroid trannie that can power both UcD400 amps (stereo). If you think this is a little low for the demands of my speakers, can I replace that with a single Plitron 750VA, 2x45 transformer as suggested by Adire? Would you use about mono power supplies? Is it worth the price for the sonic improvement?
The Hypex UcD supply HG primary caps have 20,000uF per rail, again is this enough for twin UcD400s to run off one power supply? Is this supply clean enough to power a preamp?
What does the AD8260 buffer on the AD version actually do? Why would I want that option on my UcD400s.
Can I put the DACT preamp inside the chassis with the UcDs, or will radiation affect it?
Saved my biggest question for last. Can I plug these components together and hear beautiful music, or will I stumble onto a problems that will hose me up to frustration? Any schematics you know of that show using single trans/power suplly with 2 amps?
I am thrilled to find an active forum about the Hypex amps. I am soooo excited to build my own amp instead of buying something used and not so great sounding.
Thanks for your advice.
Rich
new member
Use all Hypex parts in a UcD stereo amp?
I want to build a UcD400 stereo amp. I am not an electronics designer, but have soldering and mechanical skills. Much of the gory details you guys discuss here is not my forte, but I am learning more each day.
Instead of learning all that stuff cold before I even begin building, I am thinking about buying all the pre made components from Hypex. Seems to me they will have tested it all together and it should make the amps perform just fine. I will be running these amps with Legacy Focus 20/20 speakers which are low impedence, with 3x12" woofs, 2x7" mids, +dome and ribbon tweets. They love power, up to 500wpc. They are 95dB sensitive and play very loudly with a 50wpc stereo tube amp. I listen at moderate levels, never beyond realistic levels.
I will probably use similar pre-built components in a DIY preamp, probably DACT CT-101/CT-2 for starters, powering CT-101 with the Hypex power supply HG which has 12V out.
Some questions I have are :
Hypex sells a single 500VA toroid trannie that can power both UcD400 amps (stereo). If you think this is a little low for the demands of my speakers, can I replace that with a single Plitron 750VA, 2x45 transformer as suggested by Adire? Would you use about mono power supplies? Is it worth the price for the sonic improvement?
The Hypex UcD supply HG primary caps have 20,000uF per rail, again is this enough for twin UcD400s to run off one power supply? Is this supply clean enough to power a preamp?
What does the AD8260 buffer on the AD version actually do? Why would I want that option on my UcD400s.
Can I put the DACT preamp inside the chassis with the UcDs, or will radiation affect it?
Saved my biggest question for last. Can I plug these components together and hear beautiful music, or will I stumble onto a problems that will hose me up to frustration? Any schematics you know of that show using single trans/power suplly with 2 amps?
I am thrilled to find an active forum about the Hypex amps. I am soooo excited to build my own amp instead of buying something used and not so great sounding.
Thanks for your advice.
Rich
new member
Welcome Rich
It has better specs than stock opamp. I have not tried them but in general it is said that BB opamps are more on the darker side and this AD is more transparent and detailed. It depends on tastes and system synergy.
Big YES 😀
Only if: you don't follow the guidelines; you work in the dark; you work when sleepy; you work on a rush 😉
Just split DC power rails and ground to feed the modules. Use star ground.
Will it work if we connect a DC sensing unit at speaker + but put the acting relée at "remote on" in order to put the module OFF??
Thanks
Mauricio
It has better specs than stock opamp. I have not tried them but in general it is said that BB opamps are more on the darker side and this AD is more transparent and detailed. It depends on tastes and system synergy.
Big YES 😀
Only if: you don't follow the guidelines; you work in the dark; you work when sleepy; you work on a rush 😉
Just split DC power rails and ground to feed the modules. Use star ground.
Will it work if we connect a DC sensing unit at speaker + but put the acting relée at "remote on" in order to put the module OFF??
Thanks
Mauricio
Be careful with 45-45 secondaries. If your AC is 119 (like mine), you will have DC rails that are about 66+ volts and that is too much.
I would suggest 40-40 for the transformer secondary.
Good luck to you. I am using 700VA Plitron toroid, HG supply and two UCD400 modules. Sounds great and almost no soldering! Never used crimp terminals before.
I would suggest 40-40 for the transformer secondary.
Good luck to you. I am using 700VA Plitron toroid, HG supply and two UCD400 modules. Sounds great and almost no soldering! Never used crimp terminals before.
Freshened website at Hypex.nl
The Hypex website has been redone, looks great!
UcD700 is on there, too, ready for sale.
http://hypex.nl
Just a quick thank you too all you guys who have been sweating out the details for the last year about the best UcD400 implementation. I have been reading it all from page one, got a ways to go, but enjoying it. Your advice will help me a lot when I start to build my first amp project.
Rich
The Hypex website has been redone, looks great! UcD700 is on there, too, ready for sale.http://hypex.nl
Just a quick thank you too all you guys who have been sweating out the details for the last year about the best UcD400 implementation. I have been reading it all from page one, got a ways to go, but enjoying it. Your advice will help me a lot when I start to build my first amp project.
Rich
To reduce the ripple current in the ground, by using two rectifiers and create the star point after the capacitors.
Jan-Peter
Jan-Peter
Power Supply Voltage cutoff changed?
Jan-Peter,
I am new to this forum, but learning a lot this past week. I intend to place an order with you very soon.
I downloaded the new UcD400AD manual today, it is very thorough and informative. I noticed an interesting trend, perhaps you can comment.
In the early posts of this forum, going back 2 years, the original voltage cutoff for the UcD400 amp was 63VDC, and so a 40VAC secondary voltage was recommended. In the last version of the manual, Power supply voltage max spec was changed to 68VDC, and this goes well with your TX-501 at 42VAC secondary output. Now I see on the new manual, it is risen yet again to 72VDC.
In a related point, Adire Audio, the US importer for Hypex suggests a schematic for a powersupply to drive the UcD400 module, in which it suggests using a Tx with 45VAC secondaries. This seems to go well with the new spec of 72VDCmax supply for the amp.
One more for kicks, the datasheet on UcD supply HG puts typical AC input for that module at 46VAC.
I have searched this forum for more recent discussion about the optimum sizing of Transformer based on new max volt spec but haven't seen any recent discussion on that front.
I'm quite sure I would be happy with the performance of the amp running at -5 or even -10 vdc less than its potential, as I am not a hard rocker. But Dvorak like the big current too! it will be great to hear your view!
Does the TX-501 have any shielding built in? Is it still your best recommendation for top performance with the new higher voltage spec?
I appreciate what you guys are doing, making truly high end audio safer for the wallet.
Thanks,
Rich
Jan-Peter,
I am new to this forum, but learning a lot this past week. I intend to place an order with you very soon.
I downloaded the new UcD400AD manual today, it is very thorough and informative. I noticed an interesting trend, perhaps you can comment.
In the early posts of this forum, going back 2 years, the original voltage cutoff for the UcD400 amp was 63VDC, and so a 40VAC secondary voltage was recommended. In the last version of the manual, Power supply voltage max spec was changed to 68VDC, and this goes well with your TX-501 at 42VAC secondary output. Now I see on the new manual, it is risen yet again to 72VDC.
In a related point, Adire Audio, the US importer for Hypex suggests a schematic for a powersupply to drive the UcD400 module, in which it suggests using a Tx with 45VAC secondaries. This seems to go well with the new spec of 72VDCmax supply for the amp.
One more for kicks, the datasheet on UcD supply HG puts typical AC input for that module at 46VAC.
I have searched this forum for more recent discussion about the optimum sizing of Transformer based on new max volt spec but haven't seen any recent discussion on that front.
I'm quite sure I would be happy with the performance of the amp running at -5 or even -10 vdc less than its potential, as I am not a hard rocker. But Dvorak like the big current too! it will be great to hear your view!
Does the TX-501 have any shielding built in? Is it still your best recommendation for top performance with the new higher voltage spec?
I appreciate what you guys are doing, making truly high end audio safer for the wallet.
Thanks,
Rich
Hi Jan-Peter,
The site seems a bit inconsistent: UcD400_manual.pdf has the UcD400 absolute maximum operating voltage at 63, while UcD400_datasheet.pdf now says 65 volts is typical operation and the unit shuts down at 72 volts. I'd be dead chuffed if the higher voltage rating is correct, because I have a couple of 48 volt transformers looking for an excuse.
Thanks,
Francois.
The site seems a bit inconsistent: UcD400_manual.pdf has the UcD400 absolute maximum operating voltage at 63, while UcD400_datasheet.pdf now says 65 volts is typical operation and the unit shuts down at 72 volts. I'd be dead chuffed if the higher voltage rating is correct, because I have a couple of 48 volt transformers looking for an excuse.
Thanks,
Francois.
I ran my stereo UCD400 with 66 volt rails and it worked but got VERY hot!
I am using the 45-45 Plitron and now have the amp plugged into a PS Audio Power Plant with the AC set to 110 volts and all is good.
I am using the 45-45 Plitron and now have the amp plugged into a PS Audio Power Plant with the AC set to 110 volts and all is good.
(Posted earlier in another Hypex thread, without response)
Please someone enlighten me here 🙂
Comparing the UcD180 and UcD400 datasheet graphs of THD:
In the 180, from a very low base THD rises rapidly above as few as 20 watts.
While in the 400, THD is quite flat right to about the rated 400 watts (20 times higher)!
The applications are for driving subs:
- some 90 dB sealed (Peerless XLS) and
- the dipole Linkwitz Phoenix sub-bass,
both of which will have heavy EQ at the low end, and not need too many watts to reach their excursion limits.
Linkwitz suggests 60 watts, 100 is plenty. I don’t listen often above 95-100 dB.
** In that say 30-120 watt range, is there a sound quality difference between the 180 and 400?
** It doesn’t seem to be shown on the site - which power supply is recommended for each amp?
** Just to confirm - the PS 'modules' are stereo (not mono)?
Thank you
Richard
Please someone enlighten me here 🙂
Comparing the UcD180 and UcD400 datasheet graphs of THD:
In the 180, from a very low base THD rises rapidly above as few as 20 watts.
While in the 400, THD is quite flat right to about the rated 400 watts (20 times higher)!
The applications are for driving subs:
- some 90 dB sealed (Peerless XLS) and
- the dipole Linkwitz Phoenix sub-bass,
both of which will have heavy EQ at the low end, and not need too many watts to reach their excursion limits.
Linkwitz suggests 60 watts, 100 is plenty. I don’t listen often above 95-100 dB.
** In that say 30-120 watt range, is there a sound quality difference between the 180 and 400?
** It doesn’t seem to be shown on the site - which power supply is recommended for each amp?
** Just to confirm - the PS 'modules' are stereo (not mono)?
Thank you
Richard
Thanks for the reminder, the maximum operation voltage is 65VDC, we have corrected the datasheet.
The 48V transformer are not suitable for the UcD400!
No you have read this wrong, in the UcD400 datasheet is written THD versus Frequency at 40W, 20W and 1W. The same 40W, 20W, 1W is plotted in the UcD180 datasheet.
No, but the UcD400 can deliver more current probably better in your application.
Both power supplies can be used for the UcD180 or UcD400. And you can use one supply for two UcD modules.
Regards,
Jan-Peter
Hi Jan-Peter
Thanks ~
just for bass, in the 30-120 watt range:
What are the differences in the Sound Qualities of the two power supplies?
Thanks
Thanks ~
just for bass, in the 30-120 watt range:
What are the differences in the Sound Qualities of the two power supplies?
Thanks
bad molex connector
so i bought a stereo UCD 400 amp kit from Ken Shih and one of the molex connectors is bad to one of the modules it gets signal only some of the time but if you jiggle the wire it comes on and it is for sure the molex connection to one of the amp modules so Ken is sending me out a new one Great service.....but my question is.....i have a somewhat annoying hum could it be caused by the bad connction or is it the placement of my components? the tranny sits at the front of the case and the PS is in the middle of the case and the amp modules are in the rear of the case any thougts? thanx in advance
Chers, Carlos
so i bought a stereo UCD 400 amp kit from Ken Shih and one of the molex connectors is bad to one of the modules it gets signal only some of the time but if you jiggle the wire it comes on and it is for sure the molex connection to one of the amp modules so Ken is sending me out a new one Great service.....but my question is.....i have a somewhat annoying hum could it be caused by the bad connction or is it the placement of my components? the tranny sits at the front of the case and the PS is in the middle of the case and the amp modules are in the rear of the case any thougts? thanx in advance
Chers, Carlos
@Carlos,
I hope you get the hum fixed. Could you please send photo's of your finished amp?
I wanted to buy the same case from Ken but he has supply problems.
It's a modified entry100 right?
I hope you get the hum fixed. Could you please send photo's of your finished amp?
I wanted to buy the same case from Ken but he has supply problems.
It's a modified entry100 right?
best faston connectors
what are the best faston connectors for the ucd amps and ps part#? if i could get em at PE that would be great
CHeers, Carlos
what are the best faston connectors for the ucd amps and ps part#? if i could get em at PE that would be great
CHeers, Carlos