LCAudio Softstart - 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 27th March 2005, 11:44 AM   #1
diyAudio Member
 
Join Date: Oct 2004
Location: Sydney
Default LCAudio Softstart

Does anyone have a circuit of the mk2 lcaudio softstart? Seems both mine have stop working. I tried to measure the voltage across the relay and it's 2.5vac on one of them and on the other unit it's 6.5vac. From what I can see the relay coils are 110vac.

I tried to trace/measure the voltage leading to the relay coils. From the input voltage, there is a row of resistors which lead to a SMC which is glass and is red with a green stripe. I am speculating that this is the problem. Is it a diode? I measure the voltage before this component and it's 240vac (australia) and on the other side the voltage bounces around. Is it supposes to oscilate?

Please help
Chris
__________________
My UcD400 amplifier
http://members.optusnet.com.au/myamp
  Reply With Quote
Old 29th March 2005, 12:36 AM   #2
diyAudio Member
 
Join Date: Oct 2004
Location: Sydney
I think I've worked out that the problem lies in that diode.

Does anyone know how to work out what type it is? It is red inside the glass (as per normal) and it has a green stripe on the cathode.
__________________
My UcD400 amplifier
http://members.optusnet.com.au/myamp
  Reply With Quote
Old 11th April 2005, 05:03 AM   #3
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Hi Chris,

Any help with this??

I've seen diodes like that as well but..... I've personally no idea exactly what they are.

I think the best you can do is email LCaudio, they should be able to give you the part #, and maybe a few tips to try too.

Best of luck with it.
  Reply With Quote
Old 11th April 2005, 05:45 AM   #4
diyAudio Member
 
Join Date: Oct 2004
Location: Sydney
Quote:
Originally posted by classd4sure
Hi Chris,

Any help with this??

I've seen diodes like that as well but..... I've personally no idea exactly what they are.

I think the best you can do is email LCaudio, they should be able to give you the part #, and maybe a few tips to try too.

Best of luck with it.

Thanks for the reply.

I have resolved the problem. It was the diodes. After an extensive googling I worked out they are BAV103. I replaced them and it worked.

I worked out they where under-rated for Australian voltages, so I email the distributer of LCAudio in Australia, they contacted Lars and he confirmed this as well. I have since installed some 600V types now.

I had to use some toothpicks to jam the relays after powerup so I could keep listening during that time
__________________
My UcD400 amplifier
http://members.optusnet.com.au/myamp
  Reply With Quote
Old 11th April 2005, 05:54 AM   #5
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Heh, Right on, nice work, good to hear.
  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
When to use softstart lordvader Power Supplies 27 29th November 2007 10:41 AM
softstart on bpa? Arx Chip Amps 3 17th July 2007 03:40 PM
Softstart for Zv9? sts9fan Pass Labs 7 8th November 2006 01:33 PM
Yet another softstart PCB harryeng Pass Labs 5 24th January 2006 08:25 PM


New To Site? Need Help?

All times are GMT. The time now is 03:04 PM.


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