abyssknight - 2005-07-30 12:14 AM
Not quite that easy.
The part you linked is a mono 3/32" to 1/8" adapter. You'll need a 3/32"
(2.5mm
) to 1/8"
(3.5mm
) STEREO
(Ring-Tip-Sleeve, or RTS for short
) adapter, plus some other things. Why? Because the headphone port on the MobilePros is actually a Headphone/Mic combination jack. Headphones take one channel, microphone takes the other.
[Actually, the MobilePro jack isn't even RTS; it's a 4-conductor RTSC plug. Sleeve is common ground, ring is audio out, tip is audio in, and the collar is record control. See that little brassy bit on the outside of the headphone connector on your MobilePro? It actually does something...
If you short that brass connector to ground, apparently the recording software automatically opens on your MobilePro. I have not tried this myself.]
Basically, you have three choices for using headphones with your MP780/790:
1
) Build and adapter, as people have described in this thread.
2
) Buy a wired Cell phone headset. Most cell phones use a 3/32" RTS jack for wired headsets, which should be compatible with the MP780/790 headset jack. Just make sure the RING condictor is the headphone channel, not the TIP. Otherwise you're trying to play sound out the microphone and bad things happen to the mic when you do that.
3
) Buy multiple off-the-shelf adapters and stack them up, in the following order:
(A
) 3/32" to 1/8" Stereo adapter
(B
) 1/8" Stereo to Left/Right 1/8" Mono adapter
(C
) 1/8" Mono to 1/8" Stereo adapter
i.e
(EDIT: ASCII grafiks r teh sux0rz
)
(MobilePro
) <---
(A
) <---
(B
) <---
(C
) <---
(Headphone
)
(Microphone
)---------------^
(A
) is necessary because I have yet to find a 3/32" Stereo to 1/8" Mono L/R adapter.
(B
) takes the two channels
(normally left/right for a stereo signal, but for the MP780, it's audio out and audio in
) and splits them in to two separate jacks. So now you have a separate
(mono
) headphone jack and
(mono
) microphone jack.
(C
) takes the mono signal and sends it to both channels of stereo headphones. This is technically optional, but without
(C
) you only get sound out of one ear.
I will warn you, though, that while this option works, it places a good deal of strain on the jack on your 780/790. You basically have 3" or so sticking out the front of your unit, pulling down on the jack. It might even be better to use a short 1/8" RTS extension cable, just to take some of the weight off.
(I'll have to try that now that I think about it.
)
If you want to buy the parts at Radio Shack,
Part
(A
) is Radio Shack #274-373:
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F007%5F002%5F001%5F001&product%5Fid=274%2D373
Part
(B
) is Radio Shack #274-375:
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F007%5F002%5F001%5F002&product%5Fid=274%2D375
Part
(C
) is Radio Shack #274-882:
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F007%5F002%5F001%5F001&product%5Fid=274%2D882Edited by btrimmer 2005-07-30 3:08 AM
I kinda skipped too much basic electronics class back in college to remember enough to make sense!! 
