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Old 25th February 2009, 12:29 PM   #1
US2400 is offline US2400  Canada
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Default Headphone out schematic

Hello all.
This is my first post here.
I am looking to put a headphone out circuit on my DIY dummy load/attenuator box(Lpad). I have tried the basic voltage divider circuit but of coarse the sound is horrible. I think a cut somewhere in the 6K frequency area is needed but I'm not sure. Does any one have a schematic of a simple headphone out circuit that will provide a reasonable speaker emulation sound?
Thanks in advance
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Old 25th February 2009, 06:56 PM   #2
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http://headwize.com/projects/index.htm
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Old 26th February 2009, 03:23 AM   #3
US2400 is offline US2400  Canada
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Thanks dsavitsk for the links. There is some great info there, but they all seem to be active headphone amplifiers , I was hoping to find a circuit for a passive filter network that would somewhat emulate a speaker in the phones. The input to this circuit will be the output from a tube guitar amp that is fed to a passive Lpad attenuator capable of attenuating to a dummy load(no speaker output) So i guess this circuit would basically be a voltage divider followed by some kind of tone shaping network to reduce the mid to high end frequency hump at which I would guess to be around 6K. I know speaker emulation is a hard thing to do without modeling,but I am just looking for a basic circuit that sounds OK without a lot of components and is passive. Look forward to any responses.
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Old 26th February 2009, 06:55 PM   #4
Gordy is offline Gordy  United Kingdom
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US2400, not quite sure if I understand you, but take a look here:
http://sound.westhost.com/project100.htm
http://sound.westhost.com/projects-1a.htm
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Old 26th February 2009, 08:45 PM   #5
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Hi US2400,

maybe I am wrong, but if I understand you right, you are mainly looking for a speaker-emulator circuit (you already worked out the attenuation with a voltage divider)?
I have a Marshall 6100 (anniversary model) which has something quite close to that. It's a balanced output with speaker emulation, so you don't need mics in front of your cabinet for live performances.

Have a look at the schematic. Maybe you get inspired by this.
The speaker emulation is on the schematic for the MIDI control. But I guess you also need to look at the power amp section where the connectors go to.

http://www.drtube.com/marshall.htm#AN30

I know this is not exactly what you are looking for (a bit too complicated, active components etc) but maybe its close enough...

Cheers,
Martin
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Old 27th February 2009, 02:21 PM   #6
US2400 is offline US2400  Canada
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Thanks Gordy for your response. That is basically what I,m looking for.That circuit is close to what I used and the sound is not great,but I will try some of the resistor versions offered in the table
Thanks Bayermar Yes I'm looking for a speaker-emulator circuit but for headphones. I think your amp offers a line out circuit for patching into a board or recording device.
Basically what I am looking for is half decent sounding headphone circuit that can be installed at the output of a tube amp.
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