Input Question

lhwidget · 11th October 2009, 11:24 PM

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

Puffin · 12th October 2009, 04:37 PM

http://sound.westhost.com/project100.htm

Try that. It might be what you need.

lhwidget · 12th October 2009, 06:22 PM

Quote:

Originally Posted by Puffin

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.

Puffin · 12th October 2009, 08:27 PM

[QUOTE=

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

What is that then?

lhwidget · 13th October 2009, 12:01 AM

Quote:

Originally Posted by Puffin

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.

hotironsmoke · 1st December 2009, 09:06 PM

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

11th October 2009, 11:24 PM	#1
lhwidget diyAudio Member Join Date: Oct 2008	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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12th October 2009, 04:37 PM	#2
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	http://sound.westhost.com/project100.htm Try that. It might be what you need.

12th October 2009, 08:27 PM	#4
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	[QUOTE= an input for a preamp that properly loads a headphone circuit.[/QUOTE] What is that then?

1st December 2009, 09:06 PM	#6
hotironsmoke diyAudio Member Join Date: Mar 2009	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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