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Old 8th January 2010, 01:46 PM   #1
Hylle is offline Hylle  Denmark
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Join Date: Feb 2005
Location: Denmark
Default Headphone output

I dont know if this is the right forum to ask for his, but now I try this.

I have a 50W amp. Is it possible to make a head phone output, by just ad a resistor network to the output? I dont know if it will degrade the sound a lot.
My headphones are 80 ohm?
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Old 8th January 2010, 01:59 PM   #2
wwenze is offline wwenze  Singapore
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Join Date: Mar 2008
Some integrated amps do use the power amp or preamp portion to power their headphone out. Via resistor as mentioned.

But why use a power amp for this? Higher noise.
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Old 8th January 2010, 02:11 PM   #3
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
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use a 5w or 7W 100r series resistor. Take a 10r 500mW resistor from there to speaker ground. That loads the amp with 110r.
Now feed the headphones with the voltage across the 10r resistor. It will be ~-21dB ref main speaker output.

If that is too loud then try wiring a second 10r in parallel to the first 10r. this will be ~ -27dB.
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regards Andrew T.
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Old 11th January 2010, 08:14 AM   #4
Hylle is offline Hylle  Denmark
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Join Date: Feb 2005
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Thank you AndrewT.
That was what I needed.
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