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Old 11th February 2009, 08:12 PM   #1
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Join Date: Feb 2009
Default Hi Peeps!

Sorry, I neglected to introduce myself.

My name is Richard and I am a Website Designer and Fishery Manager from Herefordshire, UK. I have had a long-term interest in DIY audio projects since I was only 14 years old (and that was 23 years ago!)

I've built 4 Audio Amplifiers since then, my last effort was based on a 150W MOSFET Amplifier Module from Maplin Electronics in 1996. I've taken a break since then and have not created anything.

Here are a couple of pictures:

Click the image to open in full size.

Click the image to open in full size.

Sorry for the rather large image sizes!

The amp is looking a bit old now and looking at the Schematic here: http://www.cpemma.co.uk/map_100w.html I can see that over time the 3 watt 4R7 (R15) on both modules has overheated and almost melted completely!

This has resulted in a slow oscillation in the volume from each channel. Quite annoying, even though the sound quality has not deteriorated noticeably!



So I decided to start afresh and I am planning a new Amplifier based on:

Toroid: http://www.airlinktransformers.com/t...with-leads.asp
Case: http://www.modushop.biz/ecommerce/cat072_l2.php?n=1 (Last one in the list)
PSU: http://connexelectronic.com/product_...dhhve22ite7kp6 (Upgraded to 18mF ELNA caps)
AMP Module: http://connexelectronic.com/product_...4npao36e3fh2g7


This latest project should be completed within the next 3 months (I am quite busy atm!) and I'll let you all know what I think of the sound.

Rich.
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Old 11th February 2009, 08:33 PM   #2
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Hello Rich and welcome to the forums
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Old 11th February 2009, 10:28 PM   #3
49 - for the 18th time - again!
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Hi Rich - and Welcome to diyAudio!

Wish I had a $$$ for all of the toasty resistors I've replaced! Looks as if you discovered those toasted ones just before flame-out!
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