You can use the archive.org : https://web.archive.org/web/20120604061540/http://cogent14.com/~ayl/index.php/projects/diy-imod-ipod

  I cannibalized a cheap eBay headphone for the headband (frame and wire hanger), then glued up some fabric as a replacement for my Grado SR80   Also took the opportunity to mod the cables to single sided, as well as recolour the grilles.

Cool thanks, I'll get this breadboarded and try it out  Quote:

Hrmn...perhaps I worded it poorly, but I was just using those value to verify the formula.   Like you say, a gain of 5 would probably be best..so R4 = 19.5K and R3 = 3.9K?   Also..does it matter what the values of R4 and R3 are, or can I change their values as long as their ratio R4:R3...

Oh...alright...   So I will need to change the ratio of R4:R3 (and R6:R5) to determine the gain?   Therefore to get gain of 10, I will need R4 = 39K ohm and R3 = 3.9K ohm...   Does it matter what values I use for these resistors, or merely their ratio? I think the cmoy uses 10K ohm /...

Oh, thanks    Finally...am assuming R(L) is the gain resistor, and the datasheet has this at 32 ohms...but I am not sure what formula or values to calculate the gain.   Looked at Tangent's cmoy tutorial, and I'm not sure if his formula is applicable... 

This one?       Might be a silly question, but where on the diagram do I hook up the battery?

Hello forum,   Was looking around for a low-voltage headamp circuit I could build, which I could power with the USB battery pack I already carry around (an XtremeMac InCharge Portable) when I came across this TDA1308 circuit :           (original source...