Originally Posted by Ratman
Try the "audio out" jack of the laptop as opposed to the "headphone" jack. Also, is 25' really necessary?
1) bad headphone output on the laptop
2) bad cable/connectors
3) just too long of a cable
What happens if you run the laptop on battery (no power supply attached)?
Haven't tried it on battery, I always use it on AC adapter. I'll have to try the battery and hear what happens.
I suspect it is indeed the headphone output on the laptop, just maybe dirty, not a good connection to the 1/8" miniplug. I can clean the plug but cleaning the female jack of the laptop wouldn't be an easy thing to do, I figure.
I could try other cable/connectors. What I have is a short (~6 inches) cord with a male miniplug on one end and female RCA connectors on the other. I have a 25' stereo cord with male RCA connectors from that going to the ministereo. I need pretty much all of the 25' cord to reach the ministereo what with running up close to the ceiling and over two doors and the refrigerator to get to the stereo.
I figure the solution I find and settle on may well be to buy a cheap USB soundcard such as the one I already have, a UCA202 that I got on Amazon for around $30. I'm using that in a different room to enable recording to a different laptop.Edit:
I tried my U-Control UCA202 USB sound card and it sounds OK, no hum, good fidelity. I just bought another at Amazon, $27.76 with free Super Saver shipping. Problem solved, very probably. The UCA202 has RCA inputs and outputs.