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Old 13th March 2003, 09:22 PM   #1
daxy is offline daxy  Belgium
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Default My first (headphone) amp!

Took me a few hours to wire up this portable CMOY amp. Which is pretty fast seeing this was the first circuit I actualy put together. I guess I'm "proud" of it, though it seems nothing compared to some nice amps I've seen on these forums... I guess I'll improve with the next few amps I build.

It basicly follow the headwize.com article pretty strictly, using an OPA2132P (free sample), some cheap caps and cheap 5% tolerance resistors (though I hand-matched them and picked the closest ones). I've found a better source of components now, and my next amps will feature better parts (and maybe real PCB boards).

I must say it sounds much better than I expected, mainly using it with my MZ-900 minidisk player and my (semi-broken) Sennheiser MX300 headphones, though I plan on either getting some Grado SR225s or Sennheiser HD600 soon (most likely the HD600 as the Grado cans seem impossible to get around here).

Not everything is wired yet in all of these pictures (the amp is finished now, doesn't look that different).

A closeup:
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The board with some parts lying around:
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My MD player sitting on top of the amp (the blue of the case is almost the same as my player):
Click the image to open in full size.

Why am I posting this? Just to share my joy of having built my first amp really Don't be too harsh on me...
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Old 13th March 2003, 09:55 PM   #2
dhaen is offline dhaen  Europe
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Daxy,

It looks like a good start to me
I wouldn't worry about the 5% resistors. Any gain inequality will be insignificant compared to that introduced by all but the most expensive volume controls.

Thanks for sharing your project, and keep it up

Cheers,
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