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Old 11th June 2011, 02:05 AM   #1
RussVT is offline RussVT  United States
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Default Adapter with amp and mp3 input to headphones

I am looking for information on how to put together an adapter that has inputs for my amp, and an mp3 player then an output for my headphones. Could I just wire them together or do I need to put something like a diode in between to keep feed back out of the system. Ideally I want to have seperate volume controls for the inputs. I want to be able to play my guitar to music without disturbing my family. Any info woudl be appreciated.
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Old 11th June 2011, 02:44 PM   #2
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You just need a simple two input stereo mixer, and if it's a passive guitar one of them needs to be a high impedance mono input for the guitar.
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Old 11th June 2011, 03:39 PM   #3
RussVT is offline RussVT  United States
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Yeah, that is what I'm trying to get away from. A two input mixer costs money, I have lots of extra cables and parts, I just want to put something together. The input from the guitar will be out of the headphone jack of the amp, so I will not need a high impedance input for the guitar. Thanks for the input though.
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Old 11th June 2011, 05:37 PM   #4
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You could try a passive mixer using resistors and potentiometers, but I'm not sure how well it would work. The first circuit on this page shows the idea. You can add 1k-ohm rheostats for volume control.
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Old 14th June 2011, 08:47 AM   #5
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Quote:
Originally Posted by RussVT View Post
Yeah, that is what I'm trying to get away from. A two input mixer costs money, I have lots of extra cables and parts, I just want to put something together.
Not if you build it yourself, I built one to do an 'emergency' disco one night - a double opamp, couple of stereo pots, eight resistors, eight capacitors, and a 9V battery. It wasn't 'pretty', but I designed and built it in about 30 minutes

It worked perfectly - opamp mixers are really easy devices to build.
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