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Old 11th February 2009, 07:12 PM   #1
Richie B is offline Richie B  United Kingdom
diyAudio Member
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.

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Old 11th February 2009, 07:33 PM   #2
Cal Weldon is offline Cal Weldon  Canada
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Join Date: Jan 2004
Location: Near Vancouver
Hi Peeps!
Hello Rich and welcome to the forums
planet10 needs your help:
Let's help Ruth and Dave
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Old 11th February 2009, 09:28 PM   #3
c2cthomas is offline c2cthomas  United States
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Join Date: Oct 2006
Location: Near "Music City" (Nashville Tennessee)
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!
DIY audio can be expensive – but getting to see things go up in smoke - that's priceless!!!! ..... "whatever - call it brainfart of Mighty ZM"
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