UCD180 questions - Page 244

tfboy · 10th August 2011, 11:18 PM

the pot is now mounted on the chassis, so is effectively grounded.

Now, it's all working well. Not too sure if it was the fact the pot wasn't mounted in chassis causing it, but hey, ground loop buzz is very low, and (with no sound), volume has to be turned up way too much before it becomes noticeable.

Now I need to get my old Teac vrds-10 working again, the belt drive for the ejecting the transport has given up the ghost!

terteliu · 07:49 AM

to achieve 70w 8 ohm, which voltage for supply should I use? Would the ST or HG sound different at this lower input voltage?

terteliu · 29th August 2011, 06:55 PM

problem solved

Sulphur · 25th September 2011, 05:54 AM

Thinking seriously about constructing power amplifier based on the Hypex UcD180 modules.

I would prefer to use the switch mode power supply (SMPS400) due to connivence and cost saving.

My question is - will a smps degrade sound quality?

This may have been discussed elsewhere - point me in the right direction.

Any thoughts?

Thanks

Randall

crazyeight · 13th November 2011, 08:54 AM

hi,
is there any tweaks for new ucd180hg ?
because ive spent some couple of hours looking at the hotroding ucd thread but it s all about AD version.

180HG is mounted with hypex supply caps (220uF i think). i read that it s useless to put some 680uF pana fc.

do u know more about tweaking HG version ?

dtaylo3 · 24th November 2011, 05:56 PM

I have some older Hypex parts I am now building into an amp: Two 180AD modules; One 180ST power supply; a huge and impressive transformer from DIY Cable, the UCD180 630VA, which is 630Va with 30 volts to feed the power supply.

I do not have a soft start, which I will likely get in a few weeks. My question: I want to build the amp now and see if all parts are working and if I like the sound. I purchased the parts used a number of years ago and they have been sitting in my closet. Presume they will all work fine.

In the short run, if I build the amp without soft start, what real risk do I run without having soft start in place?

jhenryc · 30th December 2011, 12:37 AM

Hey Dtaylo--I built a system (UCD180) in 2005 with a much smaller power supply (160VA--weight was a major factor); it is used for a custom portable PA system. I never put a soft start in, and have never had a problem--however, for the sake of your speakers, you have to be religious about power-on/off sequence (last on, first off)!

dtaylo3 · 30th December 2011, 08:23 PM

I wound up getting a soft start module to be safe. Got it all fired up yesterday, as a matter of fact. Sounding good.

Gotez · 14th March 2012, 08:51 PM

Hi,

I just placed my UCD 180 in a new chassis. I finished one channel and I am getting a very annoying hiss. I did not have this hiss in my old chassis. Is it because the speaker terminals are so close to the amplifier or could it be a ground loop caused by the amp-on connection to the ground of the SMPS?

Any help would be appriciated!!

troystg · 09:40 PM

Quote:

Originally Posted by Gotez

Hi,

I just placed my UCD 180 in a new chassis. I finished one channel and I am getting a very annoying hiss. I did not have this hiss in my old chassis. Is it because the speaker terminals are so close to the amplifier or could it be a ground loop caused by the amp-on connection to the ground of the SMPS?

Any help would be appriciated!!

Try twisting the pwr leads and removing them from under the SMPS pcb.

BTW, I love the wood face and rear. The routed top edge looks good.

EDIT: Also try moving the signal wire to get it out of the spkr lead loop .

29th August 2011, 07:33 AM	#2432
terteliu diyAudio Member Join Date: Mar 2011 Location: Bucharest	to achieve 70w 8 ohm, which voltage for supply should I use? Would the ST or HG sound different at this lower input voltage? Last edited by terteliu; 29th August 2011 at 07:49 AM.

25th September 2011, 05:54 AM	#2434
Sulphur diyAudio Member Join Date: Sep 2011 Location: Canberra	Advice re linear v smps power supply for UcD180 Thinking seriously about constructing power amplifier based on the Hypex UcD180 modules. I would prefer to use the switch mode power supply (SMPS400) due to connivence and cost saving. My question is - will a smps degrade sound quality? This may have been discussed elsewhere - point me in the right direction. Any thoughts? Thanks Randall

30th December 2011, 12:37 AM	#2437
jhenryc diyAudio Member Join Date: Oct 2004	No soft start experience Hey Dtaylo--I built a system (UCD180) in 2005 with a much smaller power supply (160VA--weight was a major factor); it is used for a custom portable PA system. I never put a soft start in, and have never had a problem--however, for the sake of your speakers, you have to be religious about power-on/off sequence (last on, first off)!

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10th August 2011, 11:18 PM	#2431
tfboy diyAudio Member Join Date: Feb 2006 Location: Reading, Berkshire	the pot is now mounted on the chassis, so is effectively grounded. Now, it's all working well. Not too sure if it was the fact the pot wasn't mounted in chassis causing it, but hey, ground loop buzz is very low, and (with no sound), volume has to be turned up way too much before it becomes noticeable. Now I need to get my old Teac vrds-10 working again, the belt drive for the ejecting the transport has given up the ghost!

29th August 2011, 06:55 PM	#2433
terteliu diyAudio Member Join Date: Mar 2011 Location: Bucharest	problem solved

13th November 2011, 08:54 AM	#2435
crazyeight diyAudio Member Join Date: Jan 2011	hi, is there any tweaks for new ucd180hg ? because ive spent some couple of hours looking at the hotroding ucd thread but it s all about AD version. 180HG is mounted with hypex supply caps (220uF i think). i read that it s useless to put some 680uF pana fc. do u know more about tweaking HG version ?

24th November 2011, 05:56 PM	#2436
dtaylo3 diyAudio Member Join Date: Nov 2004 Location: coloradao usa	I have some older Hypex parts I am now building into an amp: Two 180AD modules; One 180ST power supply; a huge and impressive transformer from DIY Cable, the UCD180 630VA, which is 630Va with 30 volts to feed the power supply. I do not have a soft start, which I will likely get in a few weeks. My question: I want to build the amp now and see if all parts are working and if I like the sound. I purchased the parts used a number of years ago and they have been sitting in my closet. Presume they will all work fine. In the short run, if I build the amp without soft start, what real risk do I run without having soft start in place?

30th December 2011, 08:23 PM	#2438
dtaylo3 diyAudio Member Join Date: Nov 2004 Location: coloradao usa	I wound up getting a soft start module to be safe. Got it all fired up yesterday, as a matter of fact. Sounding good.