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In article ,
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In article ,
says...

Jon D wrote:

I am in the UK.

I have a hi-fi cassette player and I feed the outputs to the line-in
on the motherboard of my PC.

I get a horrible hum on the recording I make on the PC. The
recordings are of phone conversations so the overall quality of what
I am recording is not great but the hum is still very distracting.

Are you sure the hum is created when the tape is played to the computer?
Have you listened to the tape directly from the player (into stereo, into
headphones, etc.)?

(3) Or should I actually add an earth to the cassette recoder? --
Maybe take the mains earth from the mains socket and connect it to
the outer of the signal lead? Or to the brushed aluminium case of
the cassette recorder?

That may help. Worth a try, for sure!

Jon

I've seen that a couple of times on my system if the input jack is not
fully and/or correctly plugged in. What I get is pure 60 Hz hum. I
find, when it occurs, that I have moved something and partially unseated
one of the jacks. You might want to check to make sure this is not
happening and/or your cords/jacks match and aren't giving you a phase to
ground connection of some kind.

my post immediately above this -- I guess I should not have used the
term "phase to ground" as that sounds like I'm implying 120 VAC across
the connection. What I really meant was some kind of current flow from
power to ground and/or an inductance that causes/allows the ac sine wave
pattern to be present at the audio input.

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