150W Amp using STK4182II in bridged mode - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 June 2011, 12:30 AM   #1
diyAudio Member
 
Ferchito's Avatar
 
Join Date: Jun 2011
Location: Bogota, Colombia.
Default 150W Amp using STK4182II in bridged mode

Hi everyone,

This is one of my favorites chip amp using STK4182II in bridged mode, it can bring high quality sound with low cost and excellent performance.

The power supply has dual voltage of 40V and 5A current capability, better use two 10000uF in filter stage for power supply.

Letīs built them and enjoy.
Attached Images
File Type: jpg DSC02931.jpg (659.8 KB, 523 views)
  Reply With Quote
Old 8th June 2011, 12:56 AM   #2
Tomom is offline Tomom  Australia
diyAudio Member
 
Join Date: Dec 2010
Hi Ferchito, let me be one to reply to your post; seems guys here dont give much damn to STK chips, though they are reliable and very good sounding. I started with 4048XI, designed PCB for it, can acomodate two hybrids on it + bridging circuit. It sounds great. Gives 150W out with +,-60V, and sounds even better bridged, +,- 35V. What is your application for STKs..Cheers...Tom
  Reply With Quote
Old 11th June 2011, 03:07 AM   #3
diyAudio Member
 
Ferchito's Avatar
 
Join Date: Jun 2011
Location: Bogota, Colombia.
Quote:
Originally Posted by Tomom View Post
Hi Ferchito, let me be one to reply to your post; seems guys here dont give much damn to STK chips, though they are reliable and very good sounding. I started with 4048XI, designed PCB for it, can acomodate two hybrids on it + bridging circuit. It sounds great. Gives 150W out with +,-60V, and sounds even better bridged, +,- 35V. What is your application for STKs..Cheers...Tom
Hi Tomom, I agree with you about STK chips performance, my application for this circuit is for my personal entertainment, I designed PCB for bridged circuit and use two STK's for stereo amplifier and It sounds very good.

Regards,
  Reply With Quote
Old 26th January 2012, 12:14 AM   #4
diyAudio Member
 
Ferchito's Avatar
 
Join Date: Jun 2011
Location: Bogota, Colombia.
Thats just one of more amps built in with stk module by me and i think thats sound great
  Reply With Quote
Old 26th January 2012, 03:34 AM   #5
Tomom is offline Tomom  Australia
diyAudio Member
 
Join Date: Dec 2010
I have one problem with my STK4048 XI, the input is too sensitive. Any idea how to fix that?
  Reply With Quote
Old 26th January 2012, 03:56 AM   #6
Jay is offline Jay  Indonesia
diyAudio Member
 
Join Date: Feb 2003
Location: Jakarta
Quote:
Originally Posted by Tomom View Post
Hi Ferchito, let me be one to reply to your post; seems guys here dont give much damn to STK chips, though they are reliable and very good sounding.
Actually they are not reliable. They don't have internal protection against short circuit, cannot drive low impedance load. Cheap STK-based amps don't have external relay at the output so they will fail very easily.

They are indeed good sounding (less fatigue than mos amp chips, even the Gainclone).
  Reply With Quote
Old 26th January 2012, 09:44 PM   #7
Tomom is offline Tomom  Australia
diyAudio Member
 
Join Date: Dec 2010
Sorry for repeating my question, anyone knows how properly to condition input into STK4048XI? It is very sensitive, and bringing CD player or tuner signal gives almost full blast right at the begining. Thanks...
  Reply With Quote
Old 27th January 2012, 09:22 AM   #8
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
the feedback components set the passband gain.
I see 56k and 560r+100uF on both the non-inverting and the inverting sides.
This is ~40dB of gain.
Increase the 560r to ~1k5, will reduce the gain by about 10dB and also bring up the low bass output slightly.
You could experiment in using upto 2k4 for that 560r or reduce the 56k down towards 20k.

Existing non-inverting gain = 1 + 56k/560r = 101
Existing inverting gain = 56k/560r = 100

proposed gain = 1 + 56k/1k5 = 38.3 (+31.7dB)
or
1 + 20k/1k5 = 14.3 (+23dB)
__________________
regards Andrew T.
  Reply With Quote
Old 27th January 2012, 10:29 PM   #9
Tomom is offline Tomom  Australia
diyAudio Member
 
Join Date: Dec 2010
Hello Andrew, thank you for advice, I will try this and let you know of result.
  Reply With Quote
Old 28th January 2012, 07:05 AM   #10
diyAudio Member
 
Join Date: May 2008
Quote:
Originally Posted by Tomom View Post
seems guys here dont give much damn to STK chips
Right, LM and TDA are prefered. Not because they are objectively better, but they have better marketing, especially thanks to third parties, who make money from them. They are easier available, and they are usually cheaper. Also the documentation takes less effort to find and understand.

The newer STK types are hard to get and expensive. The older types are still sold, although they have been out of production for a long time, at least from Sanyo. This makes people wary about what they get, and those types usually also have specs that cannot compare to the LM and TDA amps, whether audible or not. Most of them are only specified as 8 Ohm stable, too.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  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
Operating a stereo amp in bridged mode Captn Dave Tubes / Valves 10 11th July 2010 04:55 PM
Bridged mode for C-Audio RA 3001 lento Solid State 0 19th April 2010 08:52 AM
LM4780 sounds murky in bridged mode alexcd Chip Amps 6 9th October 2006 07:52 PM
LM4780 Bridged mode and single supply ringo42 Chip Amps 1 12th July 2006 09:58 PM
Dual differential mode inductors in a bridged output lowpass filter BWRX Class D 3 17th November 2005 03:39 PM


New To Site? Need Help?

All times are GMT. The time now is 12:33 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2