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Old 29th August 2012, 01:00 AM   #1
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Default Help for a Military disabled noob

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I could use some help. I am a noob and wanted to try to make a headphone amp from a old Ti pdf on headphone amps. This is what I came up with but remeber I know nothing. I think I have the power in figured out using dc/dc converters from CUI.

But how do I control the volume?
Headphone outputs and inputs?
and what ever else is needed?

I am a recent retired iraq disabled (IED) vet and was looking for something to do between rehab. So I decided to try this. I know I can buy one but I want to make one myself. Here is the Ti PDF http://www.ti.com/lit/ds/symlink/tpa6120a2.pdf

Like I said I dont even know if I am anywere close to getting this thing right.

Please help!
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Old 29th August 2012, 02:08 AM   #2
mikje is offline mikje  United States
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Thanks for your service and sorry about the disability. I spent a year over there, 2003-2004, in Balad. Got pretty familiar with the sound and feel of mortars.
Are you set on the Ti headphone amp? There are several kits available that are better suited for your experience/skill level. If you do a Google search for DIY headphone amp, you'll have more than enough from which to choose.
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Old 29th August 2012, 05:31 AM   #3
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I kind of wanted to do this project from Ti PDF to finished project. I would really like a tube preamp then into this for amp. Is there a diffrence between running it DC or AC? And what do I need to do to make this a happen?
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Old 29th August 2012, 06:57 AM   #4
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Do I even have a start of a project here? Or am I just wasting my time.
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Old 29th August 2012, 07:35 PM   #5
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A little help please. I need to do this for me. Does it matter if its DC or should it be DC? Can I just use a ALPS volume control on this or is there something else. How can I figure out how much power will come out and at what ohms?
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Old 29th August 2012, 08:54 PM   #6
badman is online now badman  United States
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Hi dobbie:

An ambitious DIY project needs to begin with reading. It sounds like you're asking whether it needs a DC or AC power supply- that's a key indicator that you have a lot of work ahead before you are ready to start figuring out the build details. A power supply like this is always DC, rectified from a transformer that's connected to the mains.

Getting you from a level where questions like that are what you're asking, to actually being able to build something not kit-based, is a long, time consuming process and one nobody's likely to undertake. If you're dedicated to building this amp, you would do well to spend a LOT of time reading and begin with a tentative project plan, then ask questions for guidance along the way.

Some build threads are great resources to begin with, though if you want to get your feet wet right away, I agree with the suggestion that you start with a kit. You'll learn while doing, get some notion of what the basic components are and what they do, and have trained for a more ambitious later project.

Oh, and thank you for your service. I think you'll find the community here to be nicely supportive, but right now, you're asking for other people's effort while you're still early in the research phase, once you've invested a little more research time, I think you'll find you're closer to asking the "right" questions, that people will be more willing to support.
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Old 30th August 2012, 09:26 PM   #7
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I got it all figured out now. the power will be CUI chips DC and all the outputs and others are done. Now I just need to figure out what kind of power this will be putting out so I can get the resister watts correct. I am thinking that two OPA4134 at 9V and one TPA--- at 15V should be about 1000mw. I also got the board layout down to 4x5.5 inchs. I will be using a 10watt wall plug for the input power and just do a -+ rail to split it off to the three amps. I was thinking of a rail splitter for the TPA amp but CUI makes a dual regulated chip that just drops in. I should only have to run wires for the input sound and output. Just have a little cleaning to do before I order a test board. I have all the parts. Inputs would be nice from the forum, I even like the bad ones.
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Old 30th August 2012, 09:27 PM   #8
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