Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

The "instant amp project"... ;)
The "instant amp project"... ;)
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
Thread Tools Search this Thread
Old 7th March 2005, 01:09 AM   #1
sfx is offline sfx  Germany
diyAudio Member
Join Date: Feb 2004
Location: Australia
Default The "instant amp project"... ;)

Hi everyone,

can't resist to post some pictures of my latest creation. I was annoyed because my class D subwoofer amp burnt beyond repair, and the sub was sitting in my room, not doing anything. So I needed an amplifier, quick!

I got an STK086 (80 Watt RMS into 4 Ohm), and a transformer, some components, etc - about A$100 altogether. The case once was a car 240V inverter, the heatsink is an old CPU heatsink.
The whole thing took my two afternoons. The STK is not the greatest amp in the world, but it's good enough for my subwoofer. I was afraid 80 Watts RMS might not be enough (it's an electronically compensated sealed box, so power demands go up for low frequencies) - but hey, it doesn't clip even at groundshaking volumes, and drives the speaker up to 7-8 mm into excursion without significant distortion. I'm quite surprised For full-range speakers, it's ok for lower volumes, when nothing else is at hand, but THD goes up a bit at full power... But since my subwoofer is only responsible for everything below 60Hz, it does the job just fine - for now

Attached Images
File Type: jpg img_2448.jpg (56.4 KB, 618 views)
  Reply With Quote
Old 29th September 2008, 11:29 PM   #2
EsotericTT is offline EsotericTT  United States
diyAudio Member
Join Date: Sep 2008
I have been trying to repair my M&K V-2B subwoofer. It employes the same power amp chip. One day, the thing just died. So, I replaced he chip and brought it back to life. To my surprise the sub now has a curious THD problem.

Viewed on a scope, one can easily see a little glitch of high frequency oscillation at or near the zero crossing of sine waves. It sounds like a "buzz" accompanying sustained low frequency sounds. I have just about checked or replaced every single part on the PCB. Still it persists. Did you experience any similar problems?
  Reply With Quote


The "instant amp project"... ;)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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
"Proac 2.5 clone" or "Elsinore project" Joel Wesseling Multi-Way 10 26th May 2011 06:51 AM
What makes an amplifier "bright", "warm", or "neutral"? JohnS Solid State 51 13th December 2009 07:42 PM
Project 11.1 from Slone "High-Power Amplifier" Book Karl71 Solid State 46 6th October 2008 04:47 AM
My Line Array "bookshelf" project, help needed! Guijs Multi-Way 14 15th December 2005 09:34 PM
Suggestions on a preamplifier project with a "A/V processor loop" option Spyhunter Solid State 6 8th November 2001 10:31 AM

New To Site? Need Help?

All times are GMT. The time now is 07:49 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio