Jim Lesurf wrote:
In article , blackbat
wrote:
On Sun, 31 Jan 2010 19:10:54 +0000, Adrian C wrote:

Anyway, the transformer voltage stepup Jim was proposing might be worth
pursuing. A couple of LT700's from Maplin?

Well maybe. What about power? I need to power any device in a car and
in the home. Might get a bit messy.

I'd assumed the mp3 player would be battery powered as an item meant for
portable use. The transformers obviously don't need powering. So I'm not
clear what you are asking about.

Easier to just buy a second speaker
and daisy chain it... http://tinyurl.com/yd2m5x6

My FM transmitter is just about OK in my car but would have been nice to
boost it a little to improve Sig/Noise ratio.

The transformers in my CPC catalogue list step up ratios of 1:4 and 1:10.
If the impedances are suitable, etc, that could mean up to a 12dB or 20dB
improvement.

LS01463 and LS01464

I've never tried them for a task like you one want, so can't say if how
well they'd work. But they are quite small and cheap, so if it were me I'd
give them a try.

How about a dual op-amp and 4 resistors?

--
Eiron.