You can use an external DC power source for the LM and LMa
transmitters, as long as you are careful to avoid a ground loop
between the audio and power sections. See this FAQ for details:

http://lectrosonics.com/faq/faq1byref.php?id=69

Also inquired with our service manager to see what experience he has
had. Here is his reply:

<<
I have seen a few of these unit come in for repair over the
years. If you drill a hole in the battery door of the LM be sure to
remove the printed circuit board assembly prior to doing so to keep
the metal fillings from causing malfunction. We also have a cable
assembly with a 12 volt plug that is straight (Lectrosonics part #
21425) that will give more penetration. Beware of the potential for
ground loops, see FAQ # 69,
http://www.lectrosonics.com/faq/faq1byref.php?id=69 I do recommend
using the ISO9VOLT with LM.>>

http://lectrosonics.com/catalogs/UniversalCatalogPages/BattElims.htm

There is no replacement door for the LM because of its spring-loaded
mounting arrangement. It is not easy to change, so you would have to
drill a hole in the door yourself.

For wireless discussions, it would be better if you use the other
discussion group. Use the link on the left-hand side of this page to join:

http://lectrosonics.com/service/list.htm

Best regards,
Bruce Jones


--- In LecNet2@yahoogroups.com, "dhart502000" <dennis@...> wrote:
>
> I have just purchased a couple of LM transmitters (now a discontinued
> product). These transmitters have swivel battery doors. The Lectro 9V
> phantom power supply kit does not provide a replacement "door" for the
> LM series. Has anyone drilled a hole in the bottom of the existing LM
> transmitter door and made the phantom power supply work? The door is
> rather thick and I'm concerned that the right angle power cable from
> by mixer power supply may not have enough penetration to make a good
> connection. Anyone else made this work?
>