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Quick Mod for Headphone Out to Line Out?

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5/14/2000 6:26 PM

Quick Mod for Headphone Out to Line Out?

Is there a simple circuit I can build to match the impedance from a headphone output to a line input?

I have run up against this several times lately where I need a couple more outputs on a mixer or want to add a line level out to a Casio SK-1.

The output from a headphone out works of course, but is just a tad too hot and can cause ugly peaks on the transients. Sound quality suffers as well. Even with careful gain staging (Headphone out volume barely on) this happens, so I am thinking that it is an impedance mismatch.

So can this solved by adding a resistor or are we looking at a transformer?

5/15/2000 1:52 AM

you could make a little box with an in and out jack and a pot to route the signal thru. just wire up the pot the same as in your guitar. being stereo tho, you'll need a stereo input jack and just use one of the 2 hots of the jack, or use 2 pots or a stereo pot and both signals. then of course you'll need a stereo out jack too IF you make it with 2 pots or a stereo pot.

you could also just connect the ring and tip of the input stereo jack together to create a composite mono signal to send to a single pot, but mixing signals like that can cause phase cancellations depending on the content of the 2 signals. of course if your signal is mono in the 1st place you wont have to worry about it. just use either the ring or tip tab only.

trial and error is one way to find the best pot value, but i'm sure someone here can give you a better way, plus a way to use a resistor network to mix the signals together if you need to do that.

dale

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