Homemade iPod Hi-Fi mini

Simon Clement writes "Decided to add to the Apple product line with the iPod Hi-Fi mini. Here's the web page detailing its features, and there's also a link to a Flickr set showing how to build your own."

Comments

Not the strangest

[ajs318]

On The Register's hardware page there is a review of a valve amplifier for the iPod. I checked out the valve number and apparently, to those of us who grew up with Mullard (later Philips) numbers, it's an ECC88. That makes it a double triode.

So how are they running three speakers from it? Assuming the valve is not just for show ..... I suppose they could be inverting the phase to one channel using a transformer, re-inverting it at the speaker by reversing the connections and bridging the subwoofer between the two channels to give a "sum" signal. AMI stereo juke boxes used that sort of wiring scheme {except they didn't need a transformer at the input, since the left and right coils of the pickup are electrically separate: four wires, not three}. AMI and Rockola were using valves long after Wurlitzer and Seeburg had switched to transistors.

I personally think digital sources and valves don't play well together anyway: they make the digital artefacts sound worse. Tried it, didn't like it, back to trannies -- at least they disguise the "digitalness".

And the ready-made amplifier module this guy used is just completely cheating! At least he could have done something like bridge together a pair of TDA2030s for each channel {they're just op-amps, except these ones will source or sink an ampere or so without batting an eyelid} and used yet another 2030 to make a self-resonant switch-mode supply for the iPod.