Ucd180 Help needed!

-(daz84)- · 9th April 2008, 10:32 PM

Hello everyone. I need some advice or help. I have two ucd180 modules connected to a ucd-supply-st. The amps work fine i think but they like to turn off when they please and the blue leds go out. They wont turn on at all now.. Has anyone got any ideas? Thankyou..

RX5 · 10th April 2008, 01:50 AM

what is your load ?? any adttl heatsinks??

post in more info about your setup...

-(daz84)- · 10th April 2008, 09:28 AM

Thanks for the reply. Do you mean the speaker load? The transformer is runing at 42 volts. The amps are attached to the bottom of a case that i made. I have not pushed the amp and they both did the same thing turning off and on but now they dont turn on at all. I have checked all my connections via the diagrams twice before hookup..

-(daz84)- · 10th April 2008, 10:09 AM

I also put a power led on the power supply unit and it is on.. Im very confused at this. It will not turn on at all now..

Jan-Peter · 10th April 2008, 11:14 AM

Quote:

Originally posted by -(daz84)-
I also put a power led on the power supply unit and it is on.. Im very confused at this. It will not turn on at all now..

Hi, 42V AC gives you 59VDC, this is to high. The overvoltage protection starts to work.

Read the datasheet/manual......

Jan-Peter

-(daz84)- · 10th April 2008, 11:24 AM

Thank you so much for the input! Do you think i have damaged them at all?

Jan-Peter · 10th April 2008, 11:27 AM

No, I don't think so. Try it with a 30VAC tranformer.....

Jan-Peter

-(daz84)- · 10th April 2008, 02:21 PM

Thanks for the help. I feel dumb now...I suppose you live and learn lol. I am ordering the correct transformer so I hope the ucds are ok.

WJMIII · 10th April 2008, 08:59 PM

additional UcD180ST question

I am a super noob in electronics, and didn't find my answers in a faq or in my searching last night. I am assuming that most people are more advanced so my inquiry is bone-head noob! I am not a complete novice, just a UcD novice.

so if I have a nice 120VAC/42V transformer, that 42V feed into the power supply will be too much - I didn't get that from the data sheet - well, that is good to know

so I couldnt go 120>trans/42V>UcD180ST

and I couldn't go 120/trans/42v>UcD STpower supply> 180ST

but more like 120V>transformer>30V>Ucd ST power supply>180St
is that correct?

I thought I saw the max input for the PS was 42V, and I thought my transformer 42V output would work -

glt · 11th April 2008, 12:02 AM

Transformers convert AC to AC, Power Supplies convert AC to DC, the UCD works on DC, so you can't connect a transformer directly to the UCD

DC voltage = 1.41*AC voltage, so 42 volts AC = 59V

9th April 2008, 10:32 PM	#1
-(daz84)- diyAudio Member Join Date: Sep 2004	Ucd180 Help needed! Hello everyone. I need some advice or help. I have two ucd180 modules connected to a ucd-supply-st. The amps work fine i think but they like to turn off when they please and the blue leds go out. They wont turn on at all now.. Has anyone got any ideas? Thankyou..

10th April 2008, 01:50 AM	#2
RX5 diyAudio Member Join Date: Apr 2004 Location: TaC	what is your load ?? any adttl heatsinks?? post in more info about your setup... __________________ RoCk On!!! I love my diy UcD!!

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10th April 2008, 09:28 AM	#3
-(daz84)- diyAudio Member Join Date: Sep 2004	Thanks for the reply. Do you mean the speaker load? The transformer is runing at 42 volts. The amps are attached to the bottom of a case that i made. I have not pushed the amp and they both did the same thing turning off and on but now they dont turn on at all. I have checked all my connections via the diagrams twice before hookup..

10th April 2008, 10:09 AM	#4
-(daz84)- diyAudio Member Join Date: Sep 2004	I also put a power led on the power supply unit and it is on.. Im very confused at this. It will not turn on at all now..

10th April 2008, 11:24 AM	#6
-(daz84)- diyAudio Member Join Date: Sep 2004	Thank you so much for the input! Do you think i have damaged them at all?

10th April 2008, 11:27 AM	#7
Jan-Peter diyAudio Member Join Date: Sep 2003 Location: -	No, I don't think so. Try it with a 30VAC tranformer..... Jan-Peter

10th April 2008, 02:21 PM	#8
-(daz84)- diyAudio Member Join Date: Sep 2004	Thanks for the help. I feel dumb now...I suppose you live and learn lol. I am ordering the correct transformer so I hope the ucds are ok.

10th April 2008, 08:59 PM	#9
WJMIII diyAudio Member Join Date: Mar 2008	additional UcD180ST question I am a super noob in electronics, and didn't find my answers in a faq or in my searching last night. I am assuming that most people are more advanced so my inquiry is bone-head noob! I am not a complete novice, just a UcD novice. so if I have a nice 120VAC/42V transformer, that 42V feed into the power supply will be too much - I didn't get that from the data sheet - well, that is good to know so I couldnt go 120>trans/42V>UcD180ST and I couldn't go 120/trans/42v>UcD STpower supply> 180ST but more like 120V>transformer>30V>Ucd ST power supply>180St is that correct? I thought I saw the max input for the PS was 42V, and I thought my transformer 42V output would work -

11th April 2008, 12:02 AM	#10
glt diyAudio Member Join Date: Oct 2004	Transformers convert AC to AC, Power Supplies convert AC to DC, the UCD works on DC, so you can't connect a transformer directly to the UCD DC voltage = 1.41*AC voltage, so 42 volts AC = 59V

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