W. Watson wrote:
I just bought an MW FM transmitter that is battery powered. It allows
one to hook up the output of, say, a CD player to the headphone output,
and transmit the signal to select FM bands. This is fine for the most
part, but I'm wondering if there are units that have wall warts for power?

Get an appropriate wallwart and clip it across the
battery terminals. Remove the batteries, of course.
--
73, Cecil http://www.w5dxp.com