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Old 25th May 2005, 06:54 PM   #1
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Question Headphone amp idea....

Hi, first time poster.

I've been planning on building a headphone amp (for home use) for a friend and initially started looking into a tpa6120 based chip amp, then I moved on to an OPA134 based design since I wanted to use DIP8 sockets (or something else that would be easier to assemble.

While looking at some existing OPA134 designs out there, I stumbed accross people using a IC voltage divider (the TLE2426) and then a buffer after the divider (BUF634).

Well, the cogs started turning and I'm wondering about doing an amp with a voltage gain stage and then a buffer using TIs OPA627/637 followed by the BUF634 (not set on these in particular, but they seemed like they would work)

My first impression is that this would be very accurate and have a high current, low impedance output too, but I'm sure I'm missing something

Anyone have any thoughts on this idea?

Thanks!

Rob
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Old 25th May 2005, 07:39 PM   #2
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Rob, look at pages of peranders . There you find many excelent headphone amps...
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Old 25th May 2005, 07:40 PM   #3
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Well, I've been reading old threads and it sounds like this pair is used together for preamps quite effectively. I can't see any reason it wouldn't work as a headphone amp...starting to feel a little more comfortable about this general concept
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Old 25th May 2005, 07:42 PM   #4
gfiandy is offline gfiandy  United Kingdom
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This solution works well. I used a similar design some time ago on a Audio and Video Mixing desk I was working on. It was based on an aplication note from from TI. I can't find that one at the moment but found this which is very similar. Here 3 buffers are used but for driving a headphone amp you could get away with one (I did and it worked very well).

Regards,
Andrew
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Old 25th May 2005, 07:53 PM   #5
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Quote:
Originally posted by Upupa Epops
Rob, look at pages of peranders . There you find many excelent headphone amps...
Is this who you're talking about?

http://home.swipnet.se/~w-50719/hifi/

Seems like a good link!
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Old 25th May 2005, 07:57 PM   #6
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Correct - best one is with TPA ...
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Old 25th May 2005, 08:20 PM   #7
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Thanks Andrew, that's a useful document.

I'm going to sit down with Ifan (my friend who I'm building this for) and figure out how much $$$ he wants to throw at this and then start drawing out a schematic and selecting parts. I'll definitely be picking all your brains at that point
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Old 25th May 2005, 08:20 PM   #8
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Quote:
Originally posted by Upupa Epops
Correct - best one is with TPA ...
Yea, that TPA6120 looks interesting. I've got some samples on the way so I can look at them in person and decide how scared I am of their package but I think soldering them will definitely be out of my league! Fortunately I do know a few good electrical technicians here at work who may help me out
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Old 25th May 2005, 08:26 PM   #9
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For the opamp/buf634 circuit, look up the Meta42 amp. Or go to headwize.com.

I built the QRV07 from peranders. This is the one with the TPA6120. It is very detailed, sometimes maybe too much so. I bought it to test the 6120 and I was to lazy to lay out a board.

I'm looking at using the 6120 as a driver chip.
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Old 25th May 2005, 09:07 PM   #10
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For home use i think you can skip the "TLE2426" that thing is just usefull with batteries and can't give "that" much current that you could have had.

I have build peranders ORV-04 (opa627/buf634) and it works like a charm. I'm also in the progress to make my own opa627/buf634 preamp (and it would work very well as a headphoneamp.)

The TPA i'm very interested in, if someone could give some feedback on how to make that chip as good as possible as a preamp i would be glad
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