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I did the 47k resistor mod for the xtra famicom sound and wanted to add a external switch. anyone know if it is possible and will it effect anything to the resistor haveing wire attached to it. should i have to drop the resistance to account for the xtra wire in the circuit?

Why in hell's name would you want a switch?
Anyway to answer your question: as long as you dont use too thin or too long wire (aka most wire) it should be ok.

The reson i want the switch is to record the difference with it on and with off. also your saying that if the wire is to thin or too long ???????????

dont get it? sorry

I added a long cord to a switch it acted like an antenna for noise/buzzing in the sound.
If you do the stereo mod you can mix or cut out the extra channels with the pots. they are only carried on the mono line.
I guess they have nothing to do with the cpu where you get the 2 other wave/audio functions.

what if i keep the cord short ?

oh well i might just scrap the idea its kind of stupid and a waste of time and may mess it up.

You would be better off just recording from two different NES systems, one with the mod and one without.

Take the resistor off, record the music. Solder it back on, record again.

That's what the switch was supposed to be for: to connect or disconnect the resistor, but the cable to the switch ended up picking up too much RF.

Your resistance is 47000 Ohms. A short bit of wire is less than 1 Ohm. So that's a 0.002% difference, which is well below the tolerance of the resistor. Normally they are around 1% to 10% depending on the final color band on the resistor. So, I don't think you should worry about the resistance of the wire at this time.

Long wires can be an issue for other reasons (radio interference) but for insensitive audio amplifiers it takes a really long wire (several feet) to pick up the low frequency noise which they seem most sensitive to (edit: by low I mean like LF and MF radio (like AM radio) versus VHF and above, like FM radio and low-end cordless phones). Of course this isn't entirely true, my GSM phone seems to cause problems for all my amplifiers even though it's a very high frequency (UHF band).

excellent responses. thanks everyone for answering my question.

I might try the mod tonight and post it up on a video or step by step so it can go on the wiki page.

For what it's worth before I modded my NES for the powerpak I modded it to accept extra audio from real Japanese carts. In that mod I used alot of test probe wire and a bit of cat5 copper wire here and there and I don't get any buzzing.

AWSOME IT WORKS! I did it here is my video maybe it can help anyone else intrested in adding the fds sounds and having a switch. It was a lot of work but i took my time and it came out just like i wanted.

http://www.youtube.com/watch?v=9Z507Pxc ... annel_page

Hi, sorry. New here.

I recently did this mod following the youtube clip you posted. However I don't get any sound. Just the regular without the extra channel. I measured the resistance between the wire through the switch and resistor and it showed 46,6KOHM. Is this too much differance or could it be something else? I haven't tried just hooking up the resistor withouot the switch yet but the circuit is the same anyways.

Any suggestions?

Sounds like you didnt get the right pins. Try resoldering the resistor. (you might have a cold joint)

I will try to resolder the thing after work today. I'm pretty sure that I'm running the resistor through Pin 3-9 but like you said. It could be a cold joint too.