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Old 11th October 2009, 10:24 PM   #1
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Default Input Question

I want to configure an auxiliary input for an active preamp to accept headphone outputs from from CD players, mp3 players, etc.

Is it worth doing a voltage divider, or placing series resistors to properly load the headphone output of a source device, or do you just connect it directly to the preamp's input?

Thanks
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Old 12th October 2009, 03:37 PM   #2
Puffin is offline Puffin  United Kingdom
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http://sound.westhost.com/project100.htm

Try that. It might be what you need.
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Old 12th October 2009, 05:22 PM   #3
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Quote:
Originally Posted by Puffin View Post
Headphone Adaptor for Power Amplifiers

Try that. It might be what you need.
doh! Its for a projet 97 preamp from Rod's site (blush).

Thanks

Actually, what I'm trying to do is create an input for a preamp that properly loads a headphone circuit.
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Old 12th October 2009, 07:27 PM   #4
Puffin is offline Puffin  United Kingdom
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[QUOTE=

an input for a preamp that properly loads a headphone circuit.[/QUOTE]

What is that then?
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Old 12th October 2009, 11:01 PM   #5
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Quote:
Originally Posted by Puffin View Post
What is that then?
Its a voltage divider network for driving headphones safely with a power amp's speaker outputs. Handy, but kinda the opposite of what I need.
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Old 1st December 2009, 08:06 PM   #6
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Hi lhwidget
You are treading a path I painfully scouted. IMO line and headphone outputs definitely
need an active buffer input to following stages.Forget passive networks and don't bother with common emitter config. input. Use the most suitable ie emitter follower.(or FET gate follower)
You may consider bypassing your preamp with signals at this level unless its low gain.
cheers
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