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help in modification of philips SHN2500

post #1 of 3
Thread Starter 

hi, i just found an old inear stuff, philips SHN2500, in a box left in my storeroom. It still works well but i see that It doest have portability with a small size amplifier sticking with the cable. I want to separate the amplifier by taking out the plug and headfone wires and solder some female plugs onto then put the board into a new box.

but the electric board looks like below with the presence of

Left, LS, RM+

Right, RS, LM+

 

My questions are:

- do LS, RS, RM+, LM+ mean Left surround, Right surround, right mid, left mid respectively?

_ as the female plug has only 2 channels, left and right, can I solder Left, LS, LM+ together in one output line and Right, RS, RM+ are done accordingly ?

 

17052011011.jpg

post #2 of 3
Thread Starter 

pls help..............................

post #3 of 3

a quick google search shows me that they are active noise cancelling, so it would be my estimate that LM+ and RM+ are for Left Mic + and Right Mic +.  Your board also shows two pads, LEFT and RIGHT near the LS and RS pads, those I would assume are for the Left and Right Speakers.  if you have a cable from some broken head phones, I'd suggest temporarily connecting them to figure out if those lines are indeed for the speakers, and what the proper polarity is.

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