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| Heat sink is electrically isolated from Triacs with mica insulators. The board assembly uses the heatsink for mounting to the chassis also. It is a piece of 1/16" aluminum 1" wide X 1.5" long bent into an "L" with holes drilled for the Triacs and amounting screw hole on the bottom of the "L" | This is the prototype Mini Driver board.
For a
printed
Circuit
board that can
be
made
instead
(see
below).
I
used
Micro
Screw
Terminals
on
the
prototype
for
testing
but
would
not
use
them
in
a
printed
circuit
version
as
the
are
very
expensive.
Instead
I
would
use
solder
pads
with
wire
leads.
|
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 |
| You
can
see
the
mounting
holes
in
the
heatsink
in
this
view.
The
motor
connects
to
the
small
terminal
|
The Lionel R2LC
receiver
on
the
right
plugs
into
the mini driver
board
on
the
left. |
 |
 |
| Width
less
than
an
inch.
|
The
Length
is
2-3/8
inches
.
The
printed
circuit
version
will
be
about
a
1/4"
shorter.
The
pre-drilled
holes
in
the
vector
board
made
the
prototype
a
little
larger.
|
 |
 |
| Height
one
and
a
quarter
inch.
|
Testing
it
...
It
works!
|
 |
 |
| This
is
the
Schematic
of
the
Mini
AC/DC
Driver
Note the use of a 100uh RF choke in the return side of the Track voltage. This is used for Two rail operation. All return leads of bulbs and smoke unit need to go to the Terminal number 2 also.
|
This
is
an
X-ray
View
of
PC
board
design For a list of parts and PC board Design CLICK HERE R2LC Receiver Pinouts
|