Instructables

Real Tone Cable (Rocksmith) 1/4" to USB adapter

I'm doing a project. Attempting to replicate the rocksmith real tone cable. Yeah it's not going to be easy...

I need to; amplify the signal coming from the guitar, then find an Analog to digital Converter, then figure out how to conect via USB, then I want to write a program on the computer... but thats a looooonnnng way off.

I figure the voltage coming from the guitar output is about 500mv but im not sure because it's too small to read with my meter.

What kind of transistor or op-amp can I use to get the voltage to around 10v where an ADC can read it?

If you have any advice on what kind of ADC to use please let me know. I think 10v is around the min for ADC's input range. Would it be a better idea to amplify the signal further so i can use a different ADC?

If anyone has a real tone cable they feal like opening up... let me know whats inside eh?

Thanks for any help

Picture of Real Tone Cable (Rocksmith) 1/4
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gorgamin8 months ago
Tobirg2 years ago
I ordered a cable that's how come I will try to rewrite the value in the registry. (I'm not good at programming, can somebody too will order and try to write a "driver" for it)
http://www.ebay.com/itm/3M-professional-singer-use-guitar-bass-link-computer-tieline-USB-interface-ZW-/251195978335?pt=Guitar_Accessories&hash=item3a7c72725f
mrtibs2 years ago
Hi everybody. My Real Tone cable is with some bad connection and it`s annoying me a lot... so I decided to give a shot and try to repair it (or at least try :-) ). For my contribution, I added some images for you, hope they will help in your project.

If someone has some advice on how can I detect and fix this bad connection, I'd be very grateful. Maybe I'll try the heat gun trick.

ps.: sorry for my rusty english.
ps2.: I had to cut the black and white wires in order to remove the plastic front cover.
Real Tone Cable - 1.jpgReal Tone Cable - 2.jpgReal Tone Cable - 3.jpg
uarseven2 years ago
Hi everyone.
So i want to play rocksmith but i have not a rocksmith usb cable. So i do it myself.
I have a guitar hero usb michrophone for PlaySatation 2. I plug it to my pc and it recognize that Logitech Usb Michrophone and i dismantle mic and soldering the 1/4" jack for guitar. But İ have programming issue. I need rocksmith usb guitar adapter driver for playing rocksmith. Can i change Logitech Usb Michrophone to rocksmith usb guitar adapter. Anydude help me

THX...
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You could try usb microphones, replace the mic with the input jack, the rest of the circuit's ready made, though you may need to adjust the gain somehow...

Usually bodging ways in to PAs/Amps so it could take more finagling than that - however a very similar (exact same function) USB input was bundled with the keystudio pack and taking a 1/4" to mini and straight in from the guitar worked just fine...

A DI box would be a good idea in general though...
As a note - if you want headphones out, get a USB headset with mic - either leave the phones on or replace the out to them with a mini jack...

Replace the mic in with a jack from the guitar...

If you own an amp and pedal board that gets the sound your after/close to it then I'd mic the amp/DI pedal board instead...

If you're looking a handy run through solution a TC helicon voicelive happens to be a good job for running straight through to record, guitar and vox at the same time. As an experiment we jacked one in to the video camera and set the mic input to line level, worked really well there, so you could theoretically go straight in to a soundcard with one, or give the mic port a go with a converter (likely unpredictable)
amplifihip (author) 2 years ago
I guess my question is... Which one of the following devices would be easier to program?

http://machrone.net/usbguitar/
This is what's inside his USB guitar...

"The Micro USB interface has two 1/8 inch jacks, one for guitar in, the other for stereo headphone out. It has a short cord with a USB plug. It opens easily with just your fingernails and a little pressure.
It has Micronas USB codec onboard, preconfigured to record a mono input at a 16-bit, 44.1KHz sampling rate--CD quality. It outputs the signal in both the left and right channels".

or

http://www.techradar.com/news/computing-components/peripherals/how-to-make-a-usb-soundcard-679211

They both seem fairly simple to make. I just want to be sure that which ever one I choose is the best choice for programming.

Is this basically the same thing he used in the guitar right? I'd be cheaper than getting a usb headset because i'll be making a couple of them. "It's still just a USB soundcard" right?
Motorola Headset Adapter 3.5mm to MicroUSB (SYN2113)
http://www.amazon.ca/Motorola-Headset-Adapter-MicroUSB-SYN2113/dp/B001DSUUGC
amplifihip (author) 2 years ago
I was looking at using a usb soundcard or interface but the only ones i could find were very complex and very expensive. Thats why I was looking to make one. Today I found this

http://www.techradar.com/news/computing-components/peripherals/how-to-make-a-usb-soundcard-679211

Very interesting ... and exactly the level of simplicity I've been looking for!

Say I make this thing and plug it in... Do you think my programming buddy will have much trouble with getting around the plug and play driver software? Like I said I don't know much about software.

This just seems too simple to me if this is all I have to do...

Would it be possible to add another input to this for another guitar?

Thanks again you guys are life savers!
265chemic2 years ago
This is just a USB soundcard essentially, the guitar is seen as a mic. I believe the reason you need this specific cable is that the software looks for a certain hardware ID. It could be a more complex check than this however (something encrypted in the hardware) but I wouldn't be surprised if you could emulate the cable on PC using software or modifying drivers or hardware ID.
amplifihip (author) 2 years ago

Yeah and software definately isn't my thing. I have a deal with a friend that I'll do the hardware and he will write the software. I was looking at this micro usb module...

http://www.dontronics-shop.com/pousb12.html

Is that something that would work?

I've been looking for ADC's with an input range like you said and I'm not having anyluck. Could you point me in the right I'm hoping to find something with a fairly high resolution maybe 16bit? Is there anything that needs to be done between the ADC and USB Module, such as grouping or timing the data release before sending it through the USB?

Thanks for the help I really appreciate it!
There's no need to amplify the signal to 10V, most ADCs read lower level inputs as standard - 200mV is quite a normal maximum level. The conversion side isn't the biggest problem, its writing a USB driver stack !