Follow-up on: TV speaker amplifeir

Started March 1, 2013

When last we talked, you had recommended ferrite cores to keep RF
interference from the wires.

I had bought a small 12 v audio amplifer. My input came from the
earphone jack of my 12" tv, the output went to a set of phonograph
speakers from a 1930's record player/radio, which were mounted above
the bathtub between the bathroom ceiling and the wall. and the power
came from an old wall wart.

The audio was indeed amplifed but a radio station also came out of the
speakers.

I placed 2 cores around the input, one of them wrapped an extra time
before he core was closed. One core around the output. I couldn't
get the 4th core around the 12 v supply, so I put it around all the
wires going into the amplifier. (Right next to the little black box
the wires were thin, so I could do that.)

It didn't help. The radio still came through. In fact I could turn
off the DVDR input to the antenna terminals fo the TV, and the radio
came through loud and clear, with no tv interference of course..

So I gave up, opened the tv and removed the resistor to the earphone
jack. Now I have the tv volume set all the way up and use the
wall-mounted volume control to adjust the volume. Usually that
control is set pretty low, and the sound seems fine, better than the
one or two inch tv speaker that's for sure. Plus I don't have to use
the remote control to adjust the volume.

I wanted the other plan to work, so it would with any tv I put in this
spot, or elsewhere, since the tvs fail eventually. But I gave it a
shot and I'm happy.


Thanks for all the help, in this project and the previous one.

micky wrote:
Follow-up on: TV speaker amplifeir

Started March 1, 2013

When last we talked, you had recommended ferrite cores to keep RF
interference from the wires.

I had bought a small 12 v audio amplifer. My input came from the
earphone jack of my 12" tv, the output went to a set of phonograph
speakers from a 1930's record player/radio, which were mounted above
the bathtub between the bathroom ceiling and the wall. and the power
came from an old wall wart.

The audio was indeed amplifed but a radio station also came out of the
speakers.

I placed 2 cores around the input, one of them wrapped an extra time
before he core was closed. One core around the output. I couldn't
get the 4th core around the 12 v supply, so I put it around all the
wires going into the amplifier. (Right next to the little black box
the wires were thin, so I could do that.)

It didn't help. The radio still came through. In fact I could turn
off the DVDR input to the antenna terminals fo the TV, and the radio
came through loud and clear, with no tv interference of course..

So I gave up, opened the tv and removed the resistor to the earphone
jack. Now I have the tv volume set all the way up and use the
wall-mounted volume control to adjust the volume. Usually that
control is set pretty low, and the sound seems fine, better than the
one or two inch tv speaker that's for sure. Plus I don't have to use
the remote control to adjust the volume.

I wanted the other plan to work, so it would with any tv I put in this
spot, or elsewhere, since the tvs fail eventually. But I gave it a
shot and I'm happy.


Thanks for all the help, in this project and the previous one.

I would always use caution touching electrical in the bathroom, and never
while in the tub.

Greg

On Fri, 12 Jul 2013, gregz wrote:

micky wrote:
Follow-up on: TV speaker amplifeir

Started March 1, 2013

When last we talked, you had recommended ferrite cores to keep RF
interference from the wires.

I had bought a small 12 v audio amplifer. My input came from the
earphone jack of my 12" tv, the output went to a set of phonograph
speakers from a 1930's record player/radio, which were mounted above
the bathtub between the bathroom ceiling and the wall. and the power
came from an old wall wart.

The audio was indeed amplifed but a radio station also came out of the
speakers.

I placed 2 cores around the input, one of them wrapped an extra time
before he core was closed. One core around the output. I couldn't
get the 4th core around the 12 v supply, so I put it around all the
wires going into the amplifier. (Right next to the little black box
the wires were thin, so I could do that.)

It didn't help. The radio still came through. In fact I could turn
off the DVDR input to the antenna terminals fo the TV, and the radio
came through loud and clear, with no tv interference of course..

So I gave up, opened the tv and removed the resistor to the earphone
jack. Now I have the tv volume set all the way up and use the
wall-mounted volume control to adjust the volume. Usually that
control is set pretty low, and the sound seems fine, better than the
one or two inch tv speaker that's for sure. Plus I don't have to use
the remote control to adjust the volume.

I wanted the other plan to work, so it would with any tv I put in this
spot, or elsewhere, since the tvs fail eventually. But I gave it a
shot and I'm happy.


Thanks for all the help, in this project and the previous one.

I would always use caution touching electrical in the bathroom, and never
while in the tub.

Which was already hashed out when he brought it way back when.

Michael