Need help with UCD400 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th August 2008, 04:42 PM   #1
Buzzy is offline Buzzy  Singapore
diyAudio Member
 
Join Date: Apr 2007
Default Need help with UCD400

I have built a hypex ucd400st amp to power my 4 ohm passive subwoofer. I ran the line out from my PC soundcard to the rca input on the ucd400 amp. Slowly increased the play volume control on my PC. It worked fine.

However when i connect the ucd400 amp to my pioneer 1015 receiver's sub preout. I got no sound at all. I also tried connecting it through behringer feedback destroyer and still no sound at all. The same sub worked when i hooked it up thru the PC.

I followed the manual closely when building the sub. I have made one change though. I have connected the ON pin (the one that is together with signal cable) to supply ground directly instead of having a switch. Would this be a problem ?
  Reply With Quote
Old 4th August 2008, 04:44 PM   #2
Buzzy is offline Buzzy  Singapore
diyAudio Member
 
Join Date: Apr 2007
I also need some sort of volume control. Can i use a potentiometer ? If yes may i know what value would be suitable ?
  Reply With Quote
Old 6th August 2008, 11:01 AM   #3
Buzzy is offline Buzzy  Singapore
diyAudio Member
 
Join Date: Apr 2007
I have tested the UCD400 again.

This time I connected the UCD400 amp to the left preout of my pioneer vsx1015 receiver and a 8ohm speaker to the UCD400 speaker out terminals to it to see if the amp works. With this i can hear the amp play well. Then i connected the UCD400 speaker out to the 4 ohm passive subwoofer with the left preout from the receiver still connected to the UCD400. This time i can feel the cone vibrating but the sound is not loud enough. I do not have any volume control on my UCD400.

The passive subwoofer is tested to be working fine when i connect it directly to the speaker out of my receiver.

Do i not have enough gain ? Or is there something to do with input impedance ?

I really need help.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
UCD400 Amp john65b Swap Meet 4 12th November 2007 11:08 PM


New To Site? Need Help?

All times are GMT. The time now is 01:08 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2