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Old 31st March 2013, 03:05 PM   #1
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Join Date: Feb 2012
Question Headphone Amp Selection?

Hello Guys,

i am owning a pair of AKG K271 Headphones. Their ratings are 55Ohm and 200mW Pmax, and i want to drive them to the top - talking about voltage. That would make 3,3V - how can I achieve that? I would really be glad if you could tell me about an easy and cheap-to-build amp

Thanks in advance!
Daniel
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Old 1st April 2013, 08:31 AM   #2
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Join Date: Feb 2003
Location: Australia
Hi Daniel,
The 3.3V requirement refers to the RMS voltage (for a sine wave, which is customary for audio). You'll actually need 4.7V peak and around 100mA peak.

What to recommend depends on whether you want wall power or batteries, and whether you want a PCB or willing to do your own layout. But here are a few options:

O2 - NwAvGuy: O2 Details
M3 - The M Stereo Headphone Amplifier
SDS - SDS Labs Headphone Amplifier | HeadWize
Eaton - Build This High Quality Headphone Amplifier | HeadWize (Gain is very high. I'd suggest changing R5 to 4.7k; and deleting R6 to lighten the load on the opamp; then bootstrapping R7... so many options).
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Old 1st April 2013, 04:25 PM   #3
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Wow, thank you for your answer!

I am thinking of a desktop system, probably powered by an old laptop PSU (19V 2,1A)

PCB is no problem for me, I want to design it by myself and got plenty of manufacturing options in school.

Well, I think I will go for the third option, by SDS Labs.

Again, thank you very much for your help!
Daniel
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Old 2nd April 2013, 01:35 AM   #4
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Location: Australia
Just bear in mind that your PSU is a single supply (+19V) whereas the SDS amp was designed for a dual supply (+15V and -15V). The SDS can however be made to work with your single supply with a few changes. Search (DIYaudio and the internet) for how to operate opamps from a single supply.
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Old 2nd April 2013, 09:04 AM   #5
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The supply is not a great problem, i have still got a 18-0-18V toroid transformer lying around. i just wanted to get a senseful use for that psu
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