XTB-II Options

["Jeff Volp" <JeffVolp@xxxxxxx>]

I finished initial schematic capture for the XTB-II.  It will not be a
replacement for the present XTB, which will remain the convenient plug-in
booster for just about any X10 transmitter.

The basic XTB-II will include two output coupling networks to drive both
sides of a 240V distribution panel.  It will be in a larger case with a
terminal strip to connect to the AC line.  The receive amplifier and AC
filter network will be able to drive several X10 transmitters connected to
its X10 input receptacle.  This version will cost about $20 more in
components than the present XTB.

The printed circuit board will also accept optional components for the
XTB-II to emulate a TW523 interface.  This will add about $30 in components
to the present XTB cost.

A 240V version for the European market will just require a few component
changes.  There will be plenty of room for the higher voltage capacitors.
The terminal strip should make it easy to install whatever line connection
is necessary for that particular country.

Fully populated, the XTB-II has almost double the number of components that
are in the present XTB.  The European version will be offered strictly as a
kit.

I will be working on the layout over the next week.  Most axial-lead
components will again mount vertical to keep overall size down.  A DIP
version of the op-amp will be used this time, and the PIC for TW523
emulation will be socketed.  Suggestions anyone?

Jeff