Yet another softstart PCB - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 20th January 2006, 03:46 PM   #1
diyAudio Member
 
Join Date: Dec 2004
Location: Roosendaal
Talking Yet another softstart PCB

Hi Group,

This is my own softstart PCB design. Yes, I know, there are lots of others in the forum. But I am particularly proud of this one, because itís mine. I presented it inside another thread, and got a lot of questions about it, so I decided to give it itís own thread.

The softstart is designed specifically for Pass amps. You can use it to start up the amp with both an external signal, and with a switch.
I wanted to minimize both loose parts, and 230 cabling inside my amp. So I integrated the fuse on the board. The incoming power cable is connected directly to the board, and the on-off switch is integrated in the control circuit. I also integrated the bi-metal protections into the control circuit, which results in a minimum number of switches (and cables) in the 230 VAC circuit.

Itís small: 5.5cm x 10 cm. I use it inside my Aleph 5, but it can switch up to 12 amps. Start-up is done with four resistors in series, and after the chosen start-up time a second relays short-circuits these resistors leaving just one relay contact in the power path.

The development took a long time, as this was my first PCB and I had to bone up on a lot of knowledge. The first designs had way too many options, so I ďPassedĒ it, and threw everything out that did not really attributed to the start-up function. The only option I left, were three connection points that can be used for powering a DC protection circuit. The selected transformer can supply power for four relays

I know a question that is coming, but I do not have enough PCBís left. As this was a sort of try-out for me, I only ordered a small set with 10 boards. Those left are spoken for, by Berry and Leeuwarden.

Greetings, Harry
Attached Images
File Type: jpg softstartphoto.jpg (71.6 KB, 1047 views)
  Reply With Quote
Old 20th January 2006, 03:51 PM   #2
diyAudio Member
 
Join Date: Dec 2004
Location: Roosendaal
Default Schematics

This is the schematic belonging with the PCB.

All the parts (without the PCB) are only 20 Euro's
Attached Images
File Type: jpg schematics.jpg (77.1 KB, 1170 views)
  Reply With Quote
Old 20th January 2006, 03:57 PM   #3
diyAudio Member
 
Join Date: Dec 2004
Location: Roosendaal
Default Eagle

This is the PCB


Harry
Attached Images
File Type: jpg pcb.jpg (95.4 KB, 953 views)
  Reply With Quote
Old 20th January 2006, 03:58 PM   #4
diyAudio Member
 
Join Date: Dec 2004
Location: Roosendaal
And here is the BOM, and the original Eagle files


Have fun!
Harry
Attached Files
File Type: zip schematics.zip (69.1 KB, 208 views)
  Reply With Quote
Old 23rd January 2006, 02:39 PM   #5
diyAudio Member
 
promitheus's Avatar
 
Join Date: Jan 2001
Location: Germany
that looks cool.
How do you use that DC control.
  Reply With Quote
Old 24th January 2006, 09:25 PM   #6
Berry is offline Berry  Netherlands
diyAudio Member
 
Join Date: Apr 2004
Location: Netherlands
There is no dc protection in the circuit, you can use a dc protection with this board. The External DC in is an output from a pre-amp that turns the amp on.
  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
Looking for a softstart kit... rtate Solid State 7 28th February 2008 04:09 AM
When to use softstart lordvader Power Supplies 27 29th November 2007 11:41 AM
Softstart for Zv9? sts9fan Pass Labs 7 8th November 2006 02:33 PM


New To Site? Need Help?

All times are GMT. The time now is 06:32 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