Are you interested to improve cheap amplified speaker? - 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
Thread Tools Search this Thread
Old 11th December 2011, 06:53 PM   #1
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Are you interested to improve cheap amplified speaker?

These toys are around costing 20 USD or less... and offering MP3 player reader and encoder.... accepting pen drives, SD and MMC inputs, line inputs (stereo), FM radio receiver and playback equalizer (6 preset position).

Radio is sensitive, has more than 23 memory positions, manual adjust and frequency scan.

So, a cheap thing that can be improved having a simple Dx Amplifier, the old standard one simplified to use darlington output transistors...a small supply included in the stereo pcboard...all in one board, to be installed internally into these popular toys.

I know the modifications needed and i can develop and test the project myself depending forum friend's interest on that stuff.

We can install plugs to external speakers and pump out more than 20watts RMS each channel, to 8 and 4 ohms speakers having distortion smaller than 0.1% THD (0.039% at 10 Watts RMS - 8 ohms).

I can provide prototype tested, schematic, layout and help people to modify (not publishing the modifications into the Chinese toys in order to avoid them to copy)....but i will explain directly to you how to make these modifications.... in confidence.

The amplifier layout and schematic opened to whole world.....except gerbers.

This way we can use them to our own purposes instead to be used by them....they make and we go improving without let them know the tips and tricks.

I have tested something....with secret modifications i have matched (almost) the Ipod sonics (reasonable)...Here you see:

Everything sounds good with a Dx amplifier - 1 - YouTube

I will look forward by your opinions, support and interest... please publish what you think about....the idea is a super cheap system built by you, using Dx Amplifier to our fun and enjoyment and to give one on pirates.... you know.... let them feel what we are feeling because of them.... now we copy....we use...we pay cheap and we make it better!

I can put the "Corporation" guys in movement to make this come true.


Attached Images
File Type: jpg Thinking about.jpg (244.0 KB, 164 views)
File Type: jpg We can do it!.jpg (153.0 KB, 158 views)

Last edited by destroyer X; 11th December 2011 at 07:08 PM.
  Reply With Quote
Old 11th December 2011, 07:29 PM   #2
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default There are more videos about the amplified speaker

And you can see them here:

destroyersoueu's Channel - YouTube


  Reply With Quote
Old 12th December 2011, 05:24 AM   #3
Jay is offline Jay  Indonesia
diyAudio Member
Join Date: Feb 2003
Location: Jakarta
Do you mean everyone must buy the same amplified speaker to work with? Doesn't sound like a good idea, unless for local project.

A small module capable of processing various input (including radio) is common. Costs around $10. I have worked with cheap things like these and the sound quality was not as good as I wanted it, of course

If big size is not an issue (adding a DX amp will increase the size anyway), a cheap DVD player is a workable DIY alternative. They consists of (usually) switching supply that should be replaced with transformer based supply and a mainboard with MPEG/DSP. Some have USB capability (which requires additional 2 ICs if not yet supported). I think certain decoder can accept modification for additional input type (Mine is a robust CS98201).

For small speaker desktop system, a blameless amp is too big. 10W is more than enough, and I prefer the John Broskie-McAulay 12W Opamp Darlington amplifier.
  Reply With Quote
Old 12th December 2011, 08:27 AM   #4
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default These circuits are standard..the same circuit and several different brands and boxes

modification can be done in one model and will he good for all models...there is clearance, room, internal size to install a Dx amplifier (or other) inside..also the power transformer.

I have not the idea to use the MKIII was the one available to test purposes...of course it can melt the small speakers you have inside.... the transformer will not fit the box....this means to install the Titanic inside a beetle way..this is not my idea.

Any amplified speaker that has this size (several models available) will fit....all then have the same circuit board inside.

I have already developed a simple Dx amplifier, made to 10/20 watts RMS with small distortion, using darlington output (avoiding chips the sound became better as we do not have the several troubles IC construction have).

About Audio Integrated circuit issues i can write a book...or two books...but this is not the subject here...i am sure discrete has better performance..this is based in the technology used to make integrated circuits.

Thank you by your opinion... despite i disagree, i respect and was helpfull to start some discussion about the stuff.



Last edited by destroyer X; 12th December 2011 at 08:39 AM.
  Reply With Quote


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
can a enclosed bookself speaker be mod to a ported type to improve bass response joker6211 Multi-Way 8 6th July 2007 05:22 AM
A cheap ribbon you guys may be interested in georgehifi Planars & Exotics 52 13th January 2006 08:31 AM
Ampex 622 amplified speaker on ebay excellent condition! megaladonman Swap Meet 2 17th December 2004 08:51 AM
Ideas on how to improve the Thor transmission line speaker Bedroc Multi-Way 3 7th December 2003 06:46 PM
Amplified speakers Stefano Pass Labs 11 11th June 2003 06:08 PM

New To Site? Need Help?

All times are GMT. The time now is 10:37 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2