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Originally Posted by ddoingwell /img/forum/go_quote.gif
...and will that design sit on a desk and have little feet? Will it be a amp/DAC combo with multiple inputs and RCA outs? Just wondering...
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lol, I have so many "little feet" around, I used to buy feet for the amplifiers I used to make a long time ago, so I have tonnes of "little black rubber feet"
Even some clear ones now.
And tonnes of everything else needed to make such a unit...
I was thinking one set of RCA inputs to feed the preamp stage.
One set of preamp outputs, for output of course.
A built in USB DAC of course.
A switch to switch between the DAC or the RCA inputs to feed through the preamp stage.
A headphone jack or two of course
Maybe a switch for "DIRECT OUT" of the DAC to the output RCAs.
And maybe one of those fancy digital volume controls with "UP" and "DOWN" volume buttons, but I think the first model will just use the standard analogue volume control.
It will run off a standard wallwart AC power adaptor, as I've made several preamps / headphone amps with them already... back in the day... lol...
And I would love to incorporate a LM3886 power amplifier , but of course it would be fed from a separate power supply not included in the unit.
I prefer to run the LM3886 off of batteries anyways... So there would be an input for the +/- 12 Volts or so to run the power amp.
That is my dream machine so far and it will come in a metal case of course for the heat-sink for the power amp stage.
But the first model WON"T have the power amp stage, just the DAC and preamp.
Maybe two sets of input RCAs and a switch to control them....
All of that is doable and I've done it before as well... just have never sold any units like that.
I used to sell AC powered headphones amps, like I said, way back in the day... lol
And I even sold Power amplifier kits, but those were not too profitable...
Power supplies are very pricey... Never mind shipping those heavy units...
There are even a bunch of "CLASS D" power amp chip out now that run near 95% efficiency...
Unbelievably they will drive speakers up to almost 3 watts into 8 or 4 ohms off of a 5 Volt power bus.
Some even go as high as 25 Watts using 12 Volts and the chips don't even require heat sinks and are the size of dimes...
I kid you not...
I've played with a few of those chips and it blew me away that they didn't even get warm....
They didn't sound too good either, lol, but I am new at the "CLASS D" game...
That fact is that they DID work though!
I could throw one of those in as a beginner amp for "easy listening" at low levels...
Lots of ideas....