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Old 26th November 2002, 10:59 PM   #1
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Default Qucik'n'dirty headphone amp

Hello.
I'm going away for a few days (www.dreamhack.org), and i'm only bringing my laptop, which can hardly drive a pair of "ear shells" (those tiny things that you put in the inside of the ear), so i need a headphone amp that i can put together in an hour or two on an experiment board.

What i need is:
*Single voltage feed (only + voltage avavible).
*No opamps.
*A fairly standard transistor/transistors. A non-transistor dependant design would be best.
*Reasonably high input impedance
*Reasonably good sound quality.

Anyone know of a suitable design?
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Old 27th November 2002, 12:51 AM   #2
paulb is offline paulb  Canada
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1. What impedance are your headphones?
2. What are you powering it from?
3. Why no opamps? What about small power amp chips?

Anyway, check out the DoZ headphone amp, project 70 at www.sound.au.com
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Old 27th November 2002, 12:55 AM   #3
paulb is offline paulb  Canada
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Found one.
http://space.tin.it/scienza/fladelle/Page31.htm
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Old 27th November 2002, 03:14 AM   #4
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What about the echo indigo
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Old 27th November 2002, 08:22 AM   #5
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Quote:
Originally posted by paulb
1. What impedance are your headphones?
2. What are you powering it from?
3. Why no opamps? What about small power amp chips?

Anyway, check out the DoZ headphone amp, project 70 at www.sound.au.com
1. 574ohm DC reistance. that'd be around 600ohm, right? It's sennheiser HD410 in case anyone got any nymbers for it.
2. Don't know yet.
3. I can't get my hands on a decent opamp in just one day (less then 20 hours now).

Yea, alreadly looked into the DoZ, but i can't get my hands on all that stuff in 20 hours i'm afraid.
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Old 27th November 2002, 08:30 AM   #6
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Quote:
Originally posted by paulb
Found one.
http://space.tin.it/scienza/fladelle/Page31.htm
Looks nice.

s0rce: Cool, i've never seen a pcmcia soundcard before. Very nice specs too, except for that it seems to NEED a P3 500.. what the hell, must be some sort of software emulation.
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Old 27th November 2002, 02:27 PM   #7
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Hi,
I'm also thinking of building an headphone amp amp, and that circuit ( http://space.tin.it/scienza/fladelle/Page31.htm ) is nearly perfect!!! Only one thing though; I only got BC337 and BC227 transistor, so could i replace the BC239C with a 337 instead?

Best Regards,
/Chris
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Old 27th November 2002, 03:49 PM   #8
joensd is offline joensd  Germany
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Location: Germany
Hi,
Im about to build this one next:
Zen headphone amplifier
This should have more than adequate sound.
Meets all your needs but is class a and cant be built in 1-2 hours. And the input impedance wont be that high either.
Actually with your time schedule Id indeed build something with an opamp. Why not?? The "Cmoy" (Headwize) would be perfect for breadboard.

There are much more really nice sounding headphone amplifiers on Headwize .

Jens
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Old 27th November 2002, 04:19 PM   #9
halojoy is offline halojoy  Sweden
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Quote:
Originally posted by Christian
Hi,
I'm also thinking of building an headphone amp amp, and that circuit ( http://space.tin.it/scienza/fladelle/Page31.htm ) is nearly perfect!!! Only one thing though; I only got BC337 and BC227 transistor, so could i replace the BC239C with a 337 instead?

Best Regards,
/Chris
Yes, BC337 is a fast trasistor(100Mhz), only different is that it can take some more power(= more current). you mean BC327, I think
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Old 27th November 2002, 04:20 PM   #10
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Join Date: Jun 2002
Location: Sweden
Quote:
Originally posted by joensd
Hi,
Im about to build this one next:
Zen headphone amplifier
This should have more than adequate sound.
Meets all your needs but is class a and cant be built in 1-2 hours. And the input impedance wont be that high either.
Actually with your time schedule Id indeed build something with an opamp. Why not?? The "Cmoy" (Headwize) would be perfect for breadboard.

There are much more really nice sounding headphone amplifiers on Headwize .

Jens
I'm not anti-opamp, the problem is i can't get my hands on a decent opamp before tonight. A friend drew a quck scetch of an amp at school that i will probably go with, since i have the needed components at home.
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