AC/DC power supply question... - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 5th August 2001, 05:30 PM   #1
diyAudio Member
 
Join Date: Jul 2001
I want to make a sub amp that could run on 12VDC or 120VAC. It would be nice to have a car sub that I could take out of the car when i wanted to have some extra ghetto-thumping bass. I could just have a regular AC power supply and run it off a power inverter in my car... but that would be a lot of conversion and creaste a lot of heat. How would i make a DC power supply that would output about +-50VDC?
  Reply With Quote
Old 7th August 2001, 09:36 PM   #2
diyAudio Member
 
Jason Hubbard's Avatar
 
Join Date: Apr 2001
Location: Poole, England
Unhappy Power supply possibilities

If your amplifier needs 50volt split rails then you are going to need to build an inverter - these are commonplace in commercial car audio equipment as the voltage available in a car is too low to generate the kind of wattage consumers want/expect.

This is not a project to undertake lightly as it will most likely cost you almost as much to build a DIY inverter as to buy a budget readymade subwoofer amplifier, there is also significant complexity to the DIY route to consider as well.
  Reply With Quote
Old 7th August 2001, 10:32 PM   #3
blmn is offline blmn  Brazil
diyAudio Member
 
blmn's Avatar
 
Join Date: Feb 2001
Location: .
Yoda,

See at Old Colony Lab Sound (Google it!) or Amazon the book "Audio Amateur Power Amplifier Projects" from Audio Amateur. There is a complete Car Audio amp using a switched mode power supply. This supply produces aprox. +/- 45 vdc at output.

It works fine and feeds a 2x70W eff. power amp.

Regards,

blmn
  Reply With Quote
Old 8th August 2001, 01:59 AM   #4
paulb is offline paulb  Canada
diyAudio Member
 
Join Date: Jun 2001
Location: Calgary
Default Car Audio Amp project

I have that book right here. The power supply uses a custom transformer which you wind yourself; the author specifies the bobbin (Ferroxcube parts) and gives very detailed instructions on how to wind it. It uses an SG2525 IC from Motorola, which may not be available anymore.
For other sources on DC-DC converters, you may want to check the Linear Technology app notes - if you can find some (apparently no website, how weird). Should be other companies as well.
  Reply With Quote
Old 8th August 2001, 09:25 AM   #5
Geoff is offline Geoff  United Kingdom
diyAudio Member
 
Join Date: Apr 2001
Location: UK
PaulB

Linear Technology's website is at:

http://www1.linear.com/index.html

Geoff
  Reply With Quote
Old 10th August 2001, 01:03 AM   #6
blmn is offline blmn  Brazil
diyAudio Member
 
blmn's Avatar
 
Join Date: Feb 2001
Location: .
Paulb,

You can use SG3525 to replace the original IC. You're right, it's a very detailed project and I have no problems changing the circuit to use toroidal cores and other oscillation frequencies.

Regards,

blmn

  Reply With Quote
Old 10th August 2001, 01:52 AM   #7
paulb is offline paulb  Canada
diyAudio Member
 
Join Date: Jun 2001
Location: Calgary
Yoda,
As you've read, this would be an ambitious project and the economics don't work. However, more power to you.
If you want to sit down and design something instead of building someone else's, the Linear Tech app notes are full of details (thanks for that website Geoff, don't know how I missed it). Try looking at the LT1170 and related parts, they are very versatile.
  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
Amp power supply question theAnonymous1 Solid State 12 30th August 2008 05:06 AM
813 power supply question Richard Ellis Tubes / Valves 6 14th December 2007 03:41 AM
Another Power Supply Question soundbadger Tubes / Valves 12 10th October 2007 12:29 AM
Power supply question HugoR Tubes / Valves 9 9th November 2005 08:34 AM
Power supply Question Adam M. Chip Amps 10 4th May 2005 02:19 AM


New To Site? Need Help?

All times are GMT. The time now is 07:16 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