Microphone does not work

  • Thread starter Thread starter jw
  • Start date Start date
All these sounds i should be listening for - should come out of the
preamp or out of the computer speakers?

Bridging the male-female gap between either red or white link or the
other?

Sorry to be so dumb.

Duke
Click to expand...

Your finger tip has a bit of "hum" on the end of it.

Wire the preamp to the computer. Wire the computer to the computer speakers.

Any signal applied to the preamp input, should now appear on the computer speakers.

Listen to the computer speakers - then, press a finger tip against the
male pin of the cable plugged into the preamp input jack. The "hum" on
your finger, should be amplified by the preamp, and be audible
on the computer speaker. It proves there is "path continuity", if
you hear something. If there is no change, then something is blocked
in the path, such as a bad preamp.

You've already tested the computer and speakers, by using a VCR connected
to Line In on the computer. So we know that works. Now you have to
test the preamp, using a fingertip, to see if the preamp works.

Paul
 
Your finger tip has a bit of "hum" on the end of it.

Wire the preamp to the computer. Wire the computer to the computer speakers.

Any signal applied to the preamp input, should now appear on the computer speakers.

Listen to the computer speakers - then, press a finger tip against the
male pin of the cable plugged into the preamp input jack. The "hum" on
your finger, should be amplified by the preamp, and be audible
on the computer speaker. It proves there is "path continuity", if
you hear something. If there is no change, then something is blocked
in the path, such as a bad preamp.
Click to expand...

Here's dumbee again.
I did as you describe = I get a hum indeed. So that means the preamp
is okay. Whew!

Maybe the trouble lies in the phono player.
 
I did as you describe = I get a hum indeed. So that means the preamp
is okay. Whew!

Maybe the trouble lies in the phono player.
Click to expand...

I don't have a test for that. To monitor the cartridge, for a 2-3mV
signal, would be difficult at best. The only cheap method, is amplifying
it with a preamp (as you've already tried). Cheap test instruments can't
pick up signals that small.

Check that the needle is securely in place on the cartridge. If it
isn't properly mechanically coupled, that could be the reason. The
vibrations have to be transferred to the magnetic bits to generate
a signal.

There are many different forms of replacement needles for cartridges.
The last one I worked on, eons ago, looked like this. My old turntable
had a vacuum tube amp, to give some idea how old it was.

http://www.needles4turntables.com/IMG_2068.JPG

Paul
 
I don't have a test for that. To monitor the cartridge, for a 2-3mV
signal, would be difficult at best. The only cheap method, is amplifying
it with a preamp (as you've already tried). Cheap test instruments can't
pick up signals that small.

Check that the needle is securely in place on the cartridge. If it
isn't properly mechanically coupled, that could be the reason. The
vibrations have to be transferred to the magnetic bits to generate
a signal.

There are many different forms of replacement needles for cartridges.
The last one I worked on, eons ago, looked like this. My old turntable
had a vacuum tube amp, to give some idea how old it was.

http://www.needles4turntables.com/IMG_2068.JPG

Paul
Click to expand...

Thanks anyway.

I think a good way to go is for me to try to find someone with a
working vinyl player. I wonder how much luck I'll have with that.

Cya for now

Duke
 
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