Hello all... - diyAudio
Go Back   Home > Forums > Member Areas > Introductions

Introductions Welcome to the DIYaudio Community. Introduce yourself here so we can get to know you better!

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 18th November 2002, 03:12 AM   #1
diyAudio Member
 
Join Date: Nov 2002
Location: Michigan, USA
Default Hello all...

I've been a member for a few days now... ...it's really nice to find a group of people interested in DIY projects...

I play with high power audio, and build a lot of Switching power supplies for fun. (Any one interested in car audio power supplies, let me know)

By trade I'm a design engineer. My hobby... well, er... ...my wife would say it's buying test equipment, but I love electronics and science.

Current projects are a 4Ch 450W/Channel mosfet Amp, and a 12 to +-65VDC 2KW power supply to run it in my truck... ...all working, just need to be packaged, and a few small tweaks. The designs are from scratch. One future project is a computer interfaced curve tracer/burn in unit to test and match transistors.

My amp's power bandwidth is from DC to 40K (-3dB). Uniform gain from no load to 2Ohm load. It sounds really good, and I've had a hard time finding quaity recordings to listen to, and am currently unimpressed with most commerically overproduced music, yuk!
To date the best I've found is a set of pro test CD's.

Anyway, enough rambling... ....feedback welcome!

-Dan
  Reply With Quote
Old 18th November 2002, 03:18 AM   #2
cowanrg is offline cowanrg  United States
diyAudio Member
 
cowanrg's Avatar
 
Join Date: Apr 2002
Location: Lafayette, CO
Send a message via AIM to cowanrg
wow, sounds like you are gonna be a great resource for us! post any pics you have of your stuff.
  Reply With Quote
Old 18th November 2002, 03:29 AM   #3
diyAudio Member
 
dlharmon's Avatar
 
Join Date: Nov 2001
Location: TN, USA
2KW from 12V 166 amps in- That's amazing. I would like to see some schematics on that. We really could use a few more people who actively design things here.
Darrell Harmon
__________________
http://gemini.tntech.edu/~dlh5678
  Reply With Quote
Old 18th November 2002, 08:26 PM   #4
diyAudio Member
 
Join Date: Nov 2002
Location: Michigan, USA
Default 2KW from 12V...

Yeah, it is alot of current. I'm assuming about 80% eff. Also, my supply rail dropped to 9v at full load, so it was more like 275 amps input. 275 amps is close to what my hall effect current probe was reading. For dummy loads, I use twenty 100W incadescent bulbs. They make a great dummy load for 130V!

Supply is the same as any other push pull 12V supply (Look at any modern car audio amp). Basically a center tapped transformer, with each leg switched to ground alternatley (Center to +12V). The secondary, (Actually to of them, in series to give the +- Rails) are half wave rectified and filtered with a small ammount of inductance and about 16000uF of panasonic caps per rail.

I'm planning on some improvements to the amp, and then want to get some other people to build some, maybe then a kit, if I can find some $$$ backing...

I'll see if I can borrow a digital camera to get some pics on the web! The supply looks really mean... ...like something out of a SCI-FI movie.

-Dan
  Reply With Quote
Old 18th November 2002, 08:32 PM   #5
diyAudio Member
 
dlharmon's Avatar
 
Join Date: Nov 2001
Location: TN, USA
Default Re: 2KW from 12V...

Quote:
Originally posted by dkemppai

Basically a center tapped transformer, with each leg switched to ground alternatley (Center to +12V).

-Dan
What exactly are you using to switch it to ground? I'm guessing parallel fets?

I once built a supply like that, but not as big. I used a ferrite transformer and it put out about 3KV into no load. I would definitely be interested in some schematics for the ps.

Darrell Harmon
__________________
http://gemini.tntech.edu/~dlh5678
  Reply With Quote
Old 18th November 2002, 09:02 PM   #6
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Default Re: Re: 2KW from 12V...

Welcome,

Sounds like you will have some good stuff to contribute...

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 18th November 2002, 11:05 PM   #7
diyAudio Member
 
Join Date: Nov 2002
Location: Michigan, USA
Darrell,

Yes, parallel fets is exactly what I'm using. I did some cost/switch time/current/RDS on comparisons of about 10 of IRF's fets a while back. I turned out that paralleling IRF1010N's was the best way to go. I run 6 in parallel, with 1/16th inch by 3/8 Inch coper buss bars to them. The buss bars are soldered onto a circuit board, and there is one for every 3 fets. They run at about 40Khz.
I did put a a couple of 45 Volt TVS's across the switches, just in case transients go high once in a while, although I've never seem them work, even at high loads.

Actually, transistors are the easy part, there are a lot of them out there that will work just fine. The hard part is the physical layout, with cooling and inductance being major concerns. Some of it is just having a good scope to see what's going on. Once you get the hang of it, there's really nothing to it. (Again, having a good scope really helps)

-Dan
  Reply With Quote
Old 18th November 2002, 11:52 PM   #8
diyAudio Member
 
Join Date: Nov 2002
Default Hello All

Hi, I'm Joe


I have been a member here for a few days also and I thought I had better make an introduction of my own. I'm just a crazed audio nut for 30+ yrs. I'm not an engineer by any means. I am employed by a sound contractor and I fix what others brake. I am at home with any system from 5 watts to 50,000 watts. In my spare time I work,think, and play audio. I have recently been bit by the "Tube Bug" and I must admit my experience lies in the SS field. I hope that in addition to learning that maybe I can contribute something here also.
  Reply With Quote
Old 22nd November 2002, 10:59 PM   #9
diyAudio Member
 
Join Date: Nov 2002
Location: Michigan, USA
Quote:
Originally posted by cowanrg
wow, sounds like you are gonna be a great resource for us! post any pics you have of your stuff.
Finally, some pics for all to see!

This is a pic of my SMPS supply. Keep in mind that some of the wires need to be shortened, and routed. Also the filter inductors need to be mounted...
Attached Images
File Type: jpg pic02-small.jpg (87.8 KB, 61 views)
  Reply With Quote
Old 24th November 2002, 10:34 PM   #10
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default HI DAN

Couldn't help noticing you were quick off the mark.

Never mind this PITA guy,you hear.

Enjoy,
__________________
Frank
  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



New To Site? Need Help?

All times are GMT. The time now is 04:29 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