Right, I just remembered that I said I post some pics of the inside of my Arcam Alpha 10P.
So here they are. I'm a man of my word after all
There are obviously similarities to your DIY amp, as they basically perform the same task.
I'll let you read into any differences as I don't know much about the components.
From the outside
And the insides
I thought you might be interested in the caps. U.S. Made, which I found interesting.
The way they've mounted the toroid on to the PCB is much more interesting
The differences are actually quite huge, in that I have started really simple and used an IC from NS (LM3886) (a.k.a chipamp), which really is basically just a massive opamp. I can't do a huge PCB either, so it had to be done 'modular'... which in a way I prefer. But anyway, so long as it sounds good who cares!
Quite alot of space on that left side isnt there?
It looks like space for a pre-amp or something.....
I did actually get that sheet of mirror perspex. It looks so strange inside now! You look in to it...... and it's..... just like a mirror! I *still* don't have a camera, but you can just about tell / see reflections from webcam pictures.
I also got hold of an oscilloscope from my uncle (which is insanely fun to play with). The shape of a simple sinewave does have slight differences from my current amp. It's pretty impossible to tell from the picture, but everyone loves an oscilloscope display
What I find odd is that with one speaker on the new amp, and one on the old amp, playing music downmixed to mono and fading between the speakers there's bugger all difference that I can hear (though it's probably not the best of tests, the downmixing might be messing with it, or even just the fact it's one speaker at a time). But!!! I'm using this amp now, and I could swear it does sound different. It's just seems so much easier to listen to, even at the highest of volumes
Next up I am building a pre-amp (as the Cambridge preamp is slightly hissy, like *very* quiet white noise coming from the tweets), and a 'turn the power on when an input signal is detected' thing
Both of these are from Rod Elliot (There's no way I am clever enough to design these myself, I don't understand enough!), I have just drawn the PCB myself again. They'll look something like this:
signal power on
I just need to get my arse back down to staples to get the artwork photocopied
Edited by markiemrboo, 22 December 2006 - 05:20 AM.
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