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Old 1st August 2005, 02:03 AM   #1
Relax is offline Relax  United States
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Default Tiny Headphone Amps!

Alright, I have seen a lot of headphone amps out and about, and I have decided to make my own. I was wondering if anybody can point me in the correct direction. I have a few requests of any designs anyone can give me that are:

Small- both in overall size and amount of parts
Cheap- not necessarily cheap as in bad sounding and poorly made
No PCB- either point to point, or a predrilled board

If anyone has any suggestions it would be quiet nice! I plan on using this to drive my 64 ohm Behringer HPX2000, which are 100mv max. I would like a design that could be used with lower ohm loads also, maybe a selector for 64 or 32 ohm loads? Thanks a bunch for your time and suggestions!
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Old 1st August 2005, 03:10 AM   #2
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Old 1st August 2005, 03:15 AM   #3
magoo is offline magoo  United Kingdom
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Hi Relax, You might find something on this site http://www.headwize.com/ in the library/projects section. There are plenty of designs there, and also here http://www4.head-fi.org/forums/index.php?
I built a Cmoy (Chu Moy pocket amp) years ago, and while it may not be studio quality it's still working . I think it cost about $30 for the parts.
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Old 1st August 2005, 03:27 AM   #4
Relax is offline Relax  United States
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thank you very much for those two links. I also want to mention again, that I want to build this amp! hehe, I don't think i mentioned it before.
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Old 1st August 2005, 05:40 AM   #5
maxw is offline maxw  United Kingdom
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Quote:
Originally posted by Relax
thank you very much for those two links. I also want to mention again, that I want to build this amp! hehe, I don't think i mentioned it before.
Just make a chu moy
http://headwize.com/projects/showfil...=cmoy2_prj.htm
Here is one I made:
Click the image to open in full size.

So they can be really small. Just use a single dual opamp and make it on proto board. Easy:
Click the image to open in full size.

Lots of good info here on Tangents fantastic site:
http://tangentsoft.net/audio/cmoy-tutorial/
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Old 1st August 2005, 04:30 PM   #6
Relax is offline Relax  United States
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I decided to just build the cMoy on tangents site. Ordered parts from digikey. Enough to make two, that way if the first one has major issues I can rebuild, or if it works out perfectly, I can build another and sell it! should get the parts soon, since I am about 40 minutes away form Digikey, hopefuly tomorrow or wed. latest. I will post again soon. ANyone got any other ideas anyways?
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Old 1st August 2005, 07:31 PM   #7
magoo is offline magoo  United Kingdom
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You can't go far wrong with the excellent tutorial on Tangent's site. The Cmoy is a good litte amp for what it costs to make it. You can keep it dead simple or fit boutique parts. I saw this one posted on headfi http://cgi.ebay.com/ws/eBayISAPI.dll...=rvi:1:3v_home . If you want to try a different design later there are a few here http://www.geocities.com/dip16amp/index.html
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Old 1st August 2005, 07:40 PM   #8
Relax is offline Relax  United States
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That one on Ebay looks pretty tricked out, the power switch is pretty neat too, the whole multiple times do different things. I am surprised at how expensive these little amps go for, they can't be half that in parts and time. But hopefully I will start soon! thanks for your help.
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Old 1st August 2005, 07:58 PM   #9
sam9 is offline sam9  United States
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I once built one using a pair of LM38s's on 2"x2" board. It had some extra bells and whitsles, so you could probably squeeze it down further.
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Old 2nd August 2005, 10:54 PM   #10
Relax is offline Relax  United States
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Where can I find the output specs for the cMoy on Tangents web page? Does anyone know it off hand?
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