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Old 14th December 2012, 10:08 PM   #1
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Default Which design is better for portable linear amplification?

I`m building until Christamas a portable preamp for my headphones. The amp will be powered by 2x9V batteries(or maybe just one 9V battery). I`m trying to drive my headphones, a pair of Audio Technica ATH-M50 (38 ohms, 99db/1mW). I really want to use opamps and BC337/BC327 transistors(if needed) or another transistors if really needed.
I`ve attached 4 design ideas...from long tail pair to sijosae buffer. My question would be this...Which design is more linear and is also capable to drive my headphone (without impedance problems)?
The first circuit is a opamp with a buffered output designed by sijosae.
The second circuit is a opamp with a simple buffered output.
The third circuit is an opamp with an long tail pair transistors for input.
The last circuit is Rod Elliott's design, you can see the article with the circuit here. Can I use here BC337/BC327 transistors here.
And what resistor values should I use? I know that in the first circuit(w/ sijosae buffer) I have to use 2k resistors in place for R5&R6. And for the feedback loop I should use specific resistors, based on what gain I want , but nothing else about choosing resistor values.

PS: Sorry for my english.
PS2: opamp==>OP2134, transistor => BC337/BC327
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Old 14th December 2012, 10:31 PM   #2
jcx is offline jcx  United States
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if you want English reading practice: NwAvGuy: O2 Headphone Amp
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Old 16th December 2012, 04:30 AM   #3
jilldwr is offline jilldwr  Canada
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Location: Midland Ontario
I'd have to second that, the O2 is everything your looking for.
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