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A little Audio project I have virtually completed
spuddevans:
Just to update this, I have replaced the faulty chip, but in my haste to get it all back together again, I soldered a couple of signal grounds to the other amp module pcb instead of to this one (as they had been originally) and now, while the amp is working ok, I have a constant low hum. :doh:
I will have to re-solder the wires back to their original places, but I also have worked out that I need to lower the heatsinks where they mount to the chipamps because it is very easy for the lid to be deformed and short the heatsinks to ground :zap: So I will re-wire it when I do that.
As it stands, the hum does not get any louder when the amp is turned up, so at least I can drown the hum out :)
I have also hooked up my Sony DVP-S7700 player to the amp and I am just blown away by the combo. The Sony puts out a much higher level of a signal than the ipod nano, and so drives the amp much louder!!!
The bass is rock solid and soooo deep!! and the clarity of the highs and midrange are crystal clear, and never harsh even at high volume. I think that when I get the hum sorted out, this little amp will do me very well.
--- Quote from: Jonny on May 06, 2011, 01:11:44 PM ---Missed this one, nice work there Spuddy love the case and knobs but not keen in brass.
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Thanks Jonny.
If I was to make the knobs again I would be tempted to make them out of Ali' and then powder coat them, that'd take care of any tarnishing.
--- Quote ---Next step to alter the sound 6N copper purity, silver plated wire throughout.
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I have used silver plated OFC screened wire for all the signal paths
--- Quote ---Separate ground outside, dont use the supplied earth, will be able to tell if its raining!
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I've sorta already got that, I have installed an earth spike outside, but it is not seperate, it is connected to the rest of the house's earth system.
--- Quote ---Junk them cheap 1/2p resistors, go for Holco or Vishay on input stages, got mine from Croft amps down the road- wow.
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I do realise that they are not the greatest for super-fi audio, but they were all I had at the time. Maybe later on when I get a few hours listening on it, if I feel that I am not happy with the sound I will look at replacing them, maybe do just one side so that a comparison would be made easy.
--- Quote ---Another biggy is the change of the cheap diodes to something like Schotky, work tremendous with rectifiers.
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Already beat you to it bro!! :D I spent the extra when ordering componants and got high speed recovery Schotky's, well overratted for V and A.
--- Quote ---For about £150 you may well have a better performer than a multi £k amp and pre amp setup!
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That was the plan, instead of spending 2-300 on a commercial amp, I spent about 250 on components and got the enjoyment of constructing it myself.
Tim
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