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Richie B 11th February 2009 07:12 PM

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:

Sorry for the rather large image sizes!

The amp is looking a bit old now and looking at the Schematic here: 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:

Case: (Last one in the list)
PSU: (Upgraded to 18mF ELNA caps)
AMP Module:

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.


Cal Weldon 11th February 2009 07:33 PM

Hello Rich and welcome to the forums

c2cthomas 11th February 2009 09:28 PM

Hi Rich - and Welcome to diyAudio! :D :D :D

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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