Exposure 2010 No Power Supply - 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 8th March 2009, 03:01 PM   #1
diyAudio Member
 
ANDYLASER's Avatar
 
Join Date: Oct 2005
Default Exposure 2010 No Power Supply

I have an Exposure 2010 integrated amplifier which is missing its power supply. From the photos below, it would seem as though this amp was never fitted with its transformer and resevoir caps. Does anyone know what voltage TX and capacitor values would be required to get this amp into a working condition?

I also notice the 2 sets of vertical wires coming from the board at the cap positions. Was this amp supposed to have 2 caps (per channel) mounted through the board holes, or a larger one mounted horizontaly and connected to these wires? I am guessing the latter as the holes appear to be blanked underneath.

I see these sell for good money on the bay and I think it worthwhile getting it into an operational state. It will hopefully fund something a bit more interesting. Any help is much appreciated.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 8th March 2009, 03:53 PM   #2
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
I don't think that is two caps per channel.
It looks more like a pair of parallel caps for each half of a shared power supply.
The tails give the option of using a single pair of bigger caps, not necessarily higher value, just bigger. This could be higher temperature rating, higher voltage rating, higher capacitance, higher ripple rating, or any combination of these.

Where are the output devices?
What are they?
Where is the heatsink?
How much heat can it dissipate?
__________________
regards Andrew T.
  Reply With Quote
Old 8th March 2009, 04:49 PM   #3
diyAudio Member
 
ANDYLASER's Avatar
 
Join Date: Oct 2005
Output devices (4 of them) are mounted under the board and bolted to an ally slab. This is directly bolted to the bottom chassis.

Click the image to open in full size.

This Review mentions they are Sanken bipolar MOSFETs and the Tx is 2KVA. It also gives this internal picture, which answers the capacitor mounting question.


Click the image to open in full size.
  Reply With Quote
Old 8th March 2009, 05:09 PM   #4
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
one pair of output devices on a tiny heatsink indicates ~ 50 to 80W into 8r0.

That would use a 25 to 30Vac transformer.

If those devices could cope with a moderate 4ohm load then the biggest transformer that would be worth using is ~ 625VA, not 2kVA.

If you want 80W + 80W into 8r0 then a 250VA transformer will do the job admirably. 50+50W could manage with a 160/180VA transformer.

edit.
it looks like they have changed the transformer from 28 to 30Vac up to using 32 to 34Vac to get that extra power.
I think that 2,000VA is a misprint, I suspect 200VA fits better with the size and weight.

Use a 30Vac 300VA transformer and think about doubling the PCB capacitance. The 4r0 power results are a disaster even for an 8ohm rated amplifier.

ps,
I don't believe that opinion that big drivers need high damping factors to perform well. It's much more down to the Q that the speaker designer builds into the box.
__________________
regards Andrew T.
  Reply With Quote
Old 6th June 2011, 05:03 PM   #5
diyAudio Member
 
Join Date: May 2011
Hi All,

I just bought a transformer that looks very similar to the above, I am going to use it for a power suppy unit for my Naim preamp. Does anyone know how to hook up 4 AC input wires for this transformer?

Thanks for your help!

Click the image to open in full size.

Click the image to open in full size.
  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
Exposure 2010 phono board OPamp? limono Analog Line Level 6 4th January 2009 04:34 PM
Eminence CH-2010 (hemp) Any experience? Brett Multi-Way 0 19th May 2008 03:58 AM
exposure XXI gio_b Solid State 23 15th December 2007 11:14 AM
Exposure 7 pre amp help hifienthusiast Solid State 7 28th March 2006 09:25 AM
heater supply (xformer specs are 6.3V 2.5A) as supply for a power LED? jarthel Tubes / Valves 10 21st July 2003 02:30 PM


New To Site? Need Help?

All times are GMT. The time now is 01:10 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