UCD180 questions

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#2,182
300 Va should be ok to drive two UcD180's in a stereo amp, although you will probably not get the full rated power of 180 W at 4 Ohm load simultaneously in both channels, but this demand is rare in practice anyway. If you have two seperate 30-0-30 secondaries, you may want to consider to use this for seperate supplies for the left and right channel.
 
#2,183
Javin5 said:
If you have two seperate 30-0-30 secondaries, you may want to consider to use this for seperate supplies for the left and right channel.
Click to expand...

He has one transformer with two 30V secondaries. There are two ways to make bipolar (+/-) supply rails with a dual secondary transformer. One way is to connect the two windings such that you have a 30-0-30 center tapped secondary arrangement. A schematic of this type of configuration can be seen here: http://www.zero-distortion.com/techno/powersupply/powersi_04.htm


The other way is to use a full wave bridge rectifier on each secondary and then connect the ground of the upper rail and the output of the lower rail together to form the +/- rails. A schematic of this type of configuration can be seen here: http://www.zero-distortion.com/techno/powersupply/powersi_05.htm
 
#2,184
Javin5 said:
300 Va should be ok to drive two UcD180's in a stereo amp, although you will probably not get the full rated power of 180 W at 4 Ohm load simultaneously in both channels, but this demand is rare in practice anyway. If you have two seperate 30-0-30 secondaries, you may want to consider to use this for seperate supplies for the left and right channel.
Click to expand...

Ok but i would use a power supply St and not two. Toroidal has a double secondary 2x30 (30-0;30-0) without 0 in center. If I connect the 0, it would be a 30-0-30 300va?
best regards, diyfireangel

(thanks a lot for all!)


😉
 
#2,185
diyfireangel said:
Toroidal has a double secondary 2x30 (30-0;30-0) without 0 in center. If I connect the 0, it would be a 30-0-30 300va?
Click to expand...

Correct. However, if you have two separate secondaries, each labeled 30-0, you would normally connect the 0V wire of the upper secondary to the 30V wire of the lower secondary.
 
#2,186
Re: Ucd180 potentiometer

diyfireangel said:
Hi friends,
This is my first post!😀
I'm building a ucd180st amplifier.
For volume control in line in, can i use a double log potentiometer 100k value? I ask this because i've a new logarithmic alps rk27 100k. Thanks a lot!!
Click to expand...
Dear Angel
Have a look at our D-402 page at www.hawkaudio.com/d402.htm. There you can download the schematics for connecting that potentiometer.
Have fun!
John
 
#2,187
Re: Re: Ucd180 potentiometer

johnrtd said:

Dear Angel
Have a look at our D-402 page at www.hawkaudio.com/d402.htm. There you can download the schematics for connecting that potentiometer.
Have fun!
John
Click to expand...

Oh thanks, But:
At this address www.hawkaudio.com/d402.htm i can download a pdf file with a very simple building guide of a class-d amplifier.There is a input board's photo but not schematics. Therefore, can i use a simple alps rk27 100k directly (without input board)?

Thanks my friends,
your interest is most appreciated!!!!!
diyfireangel
😀
 
#2,188
potentiometer

Funny Angel you downloaded the wrong file! The other file of this "simple amplifier" holds all schematic diagrams.
Take good care of grounding. And add some small value resistors between the not-used input and ground.
Also have a good look at the power supply. The resistors there take care of harassing junk from the mains. The reason why is to be found in our tips page.
 
#2,191
ghemink said:



Wow, very cool. A nice Christmas tree decoration 🙂

Actually, I was waiting for these to place my orders so that everything could be shipped in one shipment. Actually I'm also waiting for an hypex SMPS.

Anytime soon?

Best regards

Gertjan
Click to expand...

The progress of the SMPS is going slowly.... this week we have received the samples of transformer. It's now to decide how we will arrange the feedback, there are several different options what we have to test out.

After this we have to check the EMI.

It will stil take a couple of months.

We do not like to rush this product.... 😉

Cheers,

Jan-Peter
 
#2,192
Hi Jan-peter,

I think maybe there is a minor trouble about the pdf file of your new HG regulator.

The problem seem to be about the sense connections description:

for HPR12:
S+ is pin1 or pin5?
S- is pin1 or pin5?

for HNR12:
S+ is pin1 or pin5?
S- is pin1 or pin5?
 
#2,194
Jan-Peter said:


The progress of the SMPS is going slowly.... this week we have received the samples of transformer. It's now to decide how we will arrange the feedback, there are several different options what we have to test out.

After this we have to check the EMI.

It will stil take a couple of months.

We do not like to rush this product.... 😉

Cheers,

Jan-Peter
Click to expand...


Hello Jan-Peter,

Thanks for the update. Maybe I wait a few more months then. I now use the coldamp supplies for the UcD400 modules for my woofers, works fine. However, from Hypex I would expect that the SMPS would be made with the UcD modules in mind including things like control for the standby pin and DC protection.

Best regards

Gertjan
 
#2,195
Transformer for UCD 180's

Is this a good choice for transformer for two UCD180ADs driven by one ST power supply?

Avel Y236802 500VA 30V+30V Toroidal Transformer
Price: $74.29 EA

Load Capacity: 500 VA ¤
¤ Secondary Voltage: 30V + 30V ¤
¤ Dimensions: 5.3" D x 2.2" H ¤
¤ Weight: 8.8 lbs. ¤
 
#2,196
UCD gain

Hi !

regarding the target SPL at listening position, the source voltage and the drivers sensitivity, I need a power amp wich has 9dB of gain.
Is the "Voltage Gain of the UcD Modules" document still correct for the UCD 180HG ?
I don't know where are the two resistors to change, does somedy have some photo of them ?
 
#2,197
Re: UCD gain

mbon said:
Hi !

regarding the target SPL at listening position, the source voltage and the drivers sensitivity, I need a power amp wich has 9dB of gain.
Is the "Voltage Gain of the UcD Modules" document still correct for the UCD 180HG ?
I don't know where are the two resistors to change, does somedy have some photo of them ?
Click to expand...


I guess so, gain should be 26dB. To lower it as low as 9dB would mean that the opamp input stage would actually have to attenuate the input signal. That is not possible by just changing a resistor in the opamp circuit. I guess you would have to make the input signal smaller by putting a voltage divider (attenuator) at the input. In general, I don`t think there are (m)any poweramps that have only 9dB gain. I think most people need at least 20dB or so. In your particular application, I guess you have very high efficient drivers?

Gertjan
 
#2,198
Re: Re: UCD gain

ghemink said:



I guess so, gain should be 26dB. To lower it as low as 9dB would mean that the opamp input stage would actually have to attenuate the input signal. That is not possible by just changing a resistor in the opamp circuit. I guess you would have to make the input signal smaller by putting a voltage divider (attenuator) at the input. In general, I don`t think there are (m)any poweramps that have only 9dB gain. I think most people need at least 20dB or so. In your particular application, I guess you have very high efficient drivers?

Gertjan
Click to expand...
Thanks for the feedback !

my drivers have 110dB/2.83V/1m sensitivity so comparing to the most common average 90dB sensitivity I have easily 20dB less needs in the gain.
I've read somewhere that UCD amplification module just multiply the signal by a 4.5 factor. wich is the minimum gain in your opinion ? and then I should use LESS gain AND an attenuation (how to calculate the resistor, I know to do it for speakers but not at line level specially in balanced mode)
 
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