[NotJimCarrey]

I got to the step in the build where you test the voltages before you put in the DIP8s. The problem is, IC2 , the “rail splitter”, started sparking a little. Do you think it's salvagable at all? Or is there different chip I could use, since I'm out of TLE2426, and it'd be another week before I could get another one (I'm in Afghanistan). Any idea what would cause this?

 

[holland]

A slip of the probe would do that.  The TLE2426 is pretty sensitive and easy to blow up if you slip.  In the interim you can wire in a resistor divider and match the resistors as close as possible.

 

[NotJimCarrey]

Awesome, thanks. Think 2 220kΩ 1/4s watt would do?

 

[holland]

tis a bit high.
 
pimetav2 is like a cmoy, but more current draw.
 
this is a good start with some circuit diags.
 
http://tangentsoft.com/elec/vgrounds.html
http://tangentsoft.com/audio/cmoy-tutorial/misc/cmoy-tangent-sch.pdf

 

[NotJimCarrey]

Ah, so, say 2 x 4.7Ω 1/4 watt resistors, centor of divider goes to pin 2?

 

[holland]

Quote:

Ah, so, say 2 x 4.7Ω 1/4 watt resistors, centor of divider goes to pin 2?

http://www.ti.com/lit/ds/symlink/tle2426.pdf
 
Bottom pin is the output from the divider.

 

[tangent]

Quote:

pimetav2 is like a cmoy, but more current draw.

 
That's true, though because IG and OG are separate, the headphone currents return to OG, and the currents flowing to IG are static, it's not as much a problem to have a high splitter value in a PIMETA as in a CMoy pocket amp.  The biggest problem you get is actually Johnson noise.
 
Quote:

Ah, so, say 2 x 4.7Ω 1/4 watt resistors, 

 
As long as you don't mind burning about 1 mA here, it's fine. If current draw is an issue -- and if it is, I wonder why you're building a PIMETA v2 -- you might go up to 100k or so.
 
 

centor of divider goes to pin 2?

 
You can easily figure this out with a continuity meter. All three pins are connected to major rails in the circuit, so it's easy to find a corresponding pin to test against.