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IanMayo
 
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Default Dumb amplifier to feed speaker from earphone socket

Hi all,
I want to install a pair of speakers in our en-suite so that we can
continue to hear what's on the TV in the main bedroom.

I've established that my freeview box (NetGem) continue to send sound
out via SCART when there's an earpiece in use.

I guess I need some kind of amplifier between the earpiece socket & the
speakers. It doesn't seem worth a traditional hi-fi type amplifier
just for a couple of ~4" speakers. I could purchase a couple of
"Active" speakers intended for PC/mp3-player use, but I'd quite like to
fit embedded wall-speakers.

Can anybody please:
a) confirm my intended approach is valid
b) tell me what the mini-amplifier I'm after is called
c) suggest a suitable candidate

All advice greatly appreciated.

Cheers,
Ian.

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Rob Morley
 
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Default Dumb amplifier to feed speaker from earphone socket

In article .com
IanMayo wrote:
Hi all,
I want to install a pair of speakers in our en-suite so that we can
continue to hear what's on the TV in the main bedroom.

I've established that my freeview box (NetGem) continue to send sound
out via SCART when there's an earpiece in use.

I guess I need some kind of amplifier between the earpiece socket & the
speakers. It doesn't seem worth a traditional hi-fi type amplifier
just for a couple of ~4" speakers. I could purchase a couple of
"Active" speakers intended for PC/mp3-player use, but I'd quite like to
fit embedded wall-speakers.

Still a cheap source of a small amplifier though.
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Posted to uk.d-i-y
Mike Barnes
 
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Default Dumb amplifier to feed speaker from earphone socket

In uk.d-i-y, IanMayo wrote:
Hi all,
I want to install a pair of speakers in our en-suite so that we can
continue to hear what's on the TV in the main bedroom.

I've established that my freeview box (NetGem) continue to send sound
out via SCART when there's an earpiece in use.

I guess I need some kind of amplifier between the earpiece socket & the
speakers. It doesn't seem worth a traditional hi-fi type amplifier
just for a couple of ~4" speakers. I could purchase a couple of
"Active" speakers intended for PC/mp3-player use, but I'd quite like to
fit embedded wall-speakers.

Can anybody please:
a) confirm my intended approach is valid
b) tell me what the mini-amplifier I'm after is called
c) suggest a suitable candidate


If you can live with the size, an old-fashioned but perfectly good hi-fi
amplifier costs next to nothing from eBay. Otherwise, depending on your
constructional skills, you could knock something together quite cheaply
using the IC modules available from CPC, Maplin, etc.

Questions you might consider include: Do you want stereo? Do you want an
independent volume control?

--
Mike Barnes
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Adrian C
 
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Default Dumb amplifier to feed speaker from earphone socket

IanMayo wrote:
Hi all,
I want to install a pair of speakers in our en-suite so that we can
continue to hear what's on the TV in the main bedroom.


Can anybody please:
a) confirm my intended approach is valid
b) tell me what the mini-amplifier I'm after is called
c) suggest a suitable candidate


Cheap car stereo with an auxilary audio input, small DC power supply
(maybe an old laptop power supply?)

--
Adrian C
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Posted to uk.d-i-y
Roly
 
Posts: n/a
Default Dumb amplifier to feed speaker from earphone socket

IanMayo wrote:


I guess I need some kind of amplifier between the earpiece socket & the
speakers. It doesn't seem worth a traditional hi-fi type amplifier
just for a couple of ~4" speakers. I could purchase a couple of
"Active" speakers intended for PC/mp3-player use, but I'd quite like to
fit embedded wall-speakers.



I did exactly what you describe in my kitchen and bedroom.

I used small 12 Volt amplifiers intended for boosting car stereos. The
speakers were car speakers fitted into the false ceiling. The 12 V power
comes from a ready made power supply bought from a surplus shop (
Maplins sell similar ). The amplifiers and speakers came from a boot
sale - very cheaply indeed.

I fitted a 10K log stereo potentiometer to act as a volume control. The
top & bottom terminals are wired to the SCART audio ( L & R accordingly
), while the input to the amplifier is taken from the slider and bottom
terminal. A built-in switch turns on the power supply when it's needed.

The pot is built into a blanking plate and looks very neat. The speakers
sound surprisingly good.
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