carlosfm wrote: Why do you copy something that is flawed by nature?
Carlos thanks for your input. I will look into sin(x/x) compensation and listen to it when I have time. If you come across an implementation of it please consider sending it to me or post it here. If I find it an improvement I would add it to the next version and give you credit for your input. I am more of an integrator then a designer :)
A few years ago I visited a local HIFI shop and was told that if I wanted quality sound from my computer my only option was to burn my audio files back to CDs and use a high quality CD player. I couldn't leave it alone, I started Googling and found DIY audio. Bought a TDA1543 prototype DAC from Peter Daniel and managed to get SPDIF out from my computer to the DAC. A year later this thread shows up, I remove the SPDIF interface on the DAC and replace it with a USB interface. All the while I am also building gainclones and noticed how good it sounds with a OPA627 buffer between the DAC and gain clones. Plus having the volume control before the buffer and not harming the sound quality was the icing on the cake.
The simplicity, musicality and good feeling of having built a device that brings high quality music to computers makes me want to share it. So here I am trying to share it.
So far everyone who has heard it really likes it (I like to watch the expression on their face when they first hear it :). I hope to get some comparisons to some brand name CD players and DACs on my site soon.
chris719 wrote: Sorry, but it functions nothing like an iPod
Hi Chris. I only recently heard an iPod. My neighbour left me with it overnight a few weeks back. Very nice device. All that functionality in such a small device and the sound quality was better then I expected.
The functionality that I find similar between an iPod and my DAC is the fact that CDs are not part of it, huge play lists, everything at your finger tips, and musical. A huge differences is that my DAC is not portable. Sure you can use a old $300 laptop as the user interface (all it needs is a USB port) but this DAC uses mains for power. If you take a close look at the DAC you will notice it is 90% power supply with most of the tweaking in this area. I believe this is a big reason why it sounds so heavenly. From experience I know that changing one of the power supply caps with a different value, brand, polarity(type N BlackGate) or one that isn't broken-in makes a sonic difference. My favorite version of this DAC is with two 130VA transformers, try putting that in your shirt pocket.
Use the iPod when you are out and about, but when at home you can take the sound quality up a few notches by using a high quality USB DAC without leaving your iPod lifestyle. I almost never go out, but if did I would own a iPod to continue with my music lifestyle when out and about.
Enjoy the music.