M&K MX-100 amplifier - 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 22nd January 2006, 04:53 AM   #1
diyAudio Member
 
Join Date: May 2004
Location: Colorado
Question M&K MX-100 amplifier

I am having a little trouble figuring out an M&K amp that I bought. It is pulled from a MX-100THX subwoofer and I was wondering about all the connections. The only connection that I can see from the back is the translucent connector in the top left hand corner.

I plugged it in, however the led on the front plate did not light up. I measured the voltage across the two terminals on the connector in the top left hand corner that comes from the power cord and through the fuse, which I am assuming that powers the amp which then makes the power LED to turn on. However, it seems that I am missing a module to make this work somehow? Does anyone know what I am missing?

Does anyone have any more info on this amp that can assist me in integrating this into my DIY project?

ANY info would be GREATLY appriciated.

For full size image please go to:

http://img62.imageshack.us/img62/5228/dscf20871ek.jpg
Attached Images
File Type: jpg dscf2087.jpg (82.7 KB, 394 views)
  Reply With Quote
Old 22nd January 2006, 08:39 AM   #2
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
I don't see a power supply.
  Reply With Quote
Old 22nd January 2006, 01:17 PM   #3
diyAudio Member
 
Join Date: May 2004
Location: Colorado
Thats exactly what I was thinking.....
  Reply With Quote
Old 22nd January 2006, 01:35 PM   #4
diyAudio Member
 
ShinOBIWAN's Avatar
 
Join Date: Feb 2004
Location: UK
You haven't passed AC voltages into the amp have you? If you did it will be toast.

There should be a transformer of a specific voltage along with rectifiers and electrolytic capacitors that provide DC voltage to get the amp working.

If all what you have is shown in the photo then your clearly missing these parts. You also need to know what size transformer you require to safely operate the amp and to extract its rated power output.
  Reply With Quote
Old 22nd January 2006, 01:39 PM   #5
diyAudio Member
 
Join Date: May 2004
Location: Colorado
No, I have not passed any current into the circut at all.

Thats why I kinda knew that I was missing parts because the connector that I was talking about looks like it should plug into a power supply of some sort and that in turn plugs back into the board somehow.

Does anyone have a similar M&K subwoofer that can explain exactly what module I am missing and/or how it connects?

Thanks for your help so far
  Reply With Quote
Old 3rd February 2006, 01:01 AM   #6
diyAudio Member
 
Join Date: May 2004
Location: Colorado
I have just recieved the additional parts that went to the amp, so now I am relieved...

I am now faced with the task of connecting all the wires correctly. I have the power supply circutry that was mentioned before, as it is included in the picture. I have connected the square connector to the main board of the amp unit itself which fits correctly.

I am left with 2 pairs of thicker gauge wires (red & black) that I am assuming that leads to the two 12" woofers that this amp powered. I am left with supplying the power supply unit with 110v AC. I am assuming that the power lead connector (again the smaller plastic connector) to the caps and the transformer.

The two smaller red wires lead directly to the board with the caps and I am wondering if these are supposed to have the power supplied to them? If so, how can I tell which polarity I am supposed to hook them up to? I looked under the PCB containing the caps, and the right side is labeled "line" with a "+" and the left side is labeled "AC" with a "-" sign....

I hope that helps, if you need more pics, I can take them to clear everything up....

Thanks for your help!
Attached Images
File Type: jpg dsc00106.jpg (93.9 KB, 211 views)
  Reply With Quote
Old 3rd February 2006, 04:05 AM   #7
diyAudio Member
 
ShinOBIWAN's Avatar
 
Join Date: Feb 2004
Location: UK
It sounds to me like the original transformer had dual secondary winding.

This is common as one supplies the amplifier section of the board and another (usually around 12v) supplies the protection circuitry.

I don't see a step down section so I assume this to be true. Its probably best if you get a second opinion as I'm barely qualified enough to be answering a question in the solid state forum.
  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
Wanted: DIY amplifier builder with experience. I need a 0.7 ohm stable amplifier Audiophilenoob Swap Meet 34 16th May 2005 11:58 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier. novtango Pass Labs 2 21st October 2002 01:50 AM


New To Site? Need Help?

All times are GMT. The time now is 10:48 AM.


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