Home › Forums › temp › Using PC for audio source – Is earphone jack sufficient? › Hi Phil, The bottom line
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The bottom line answer is yes, the earphone jack is just as good as a line-out jack.
I agree, the line out jack is as good as the ear jack, I don’t believe I said otherwise.
Unless you own a high end “multi-media” computer, you likely don’t have a “sound card”. Your audio is handled by an audio chip on the motherboard,..
I assume you’re referring to laptops, since all desktops have sound cards. I think when I was referring to the laptops I called them ‘audio circuits’ — but I may have said cards.. my bad.
Searching the web for computer audio “static” returns a ton of hits.
I see where you’re coming from, but for the record; my searches were: “usb sound card”, “internal sound card vs external sound card” sound card reviews”, and “pc audio quality”. I didn’t go searching for problems, I searched for improvements, and my post reflected what I found.
The outputs are fed by op amps inside the chip…. ….datasheet shows the output impedances as follows:
– Headphone output: 10 ohms
– Line output: 200 ohms
The difference is insignificant for feeding typical AM transmitters which have an input impedance of 10k ohms minimum.
Again I was not making comparisons between the ear and out jacks. But as for the ‘difference being insignificant’.. perhaps, or perhaps not, I’ll tell you now that my knowledge is minimal about how much difference there is between a 10ohm output and a 200ohm output; I know there’s a 190ohm span there, but haven’t a clue as to the significance of it.
I don’t possess such technical knowledge. What little I do know is from vaque comprehensions I gather from listening to you guys.
I’m just utilizing the technics and methods made evident by people like you and the rest on this forum, and other forums…
Ok… Let me convey it this way;
I started this topic off questioning the quality of the output coming from the earphone jack .. or, if you will, the line out jack – and I did have laptop in my mind, thus opted to setting up a desktop…
My view is coming from the fact that for the last couple weeks I’ve been spending money on an air chain, and then it occurred to me that this costly processing equipment is all intended to push that audio coming out of that little earphone! — So naturally, I think, wait a minute, how good is that sound quality to start with?
Which brings us back to where it started… “Is the earphone jack sufficient?”
I’m just saying that if we’re going to be spending money and time on getting the sound right, shouldn’t the originating audio source be looked at a little closer.