Add-A-Stop Combination Action
Add-A-Stop Combination Action
This is the prototype "Add-A-Stop" miniature combination action (about 6" by 3.5"). It controls one stop by means of 16
pistons, a reversible, a CANCEL button, and an optional SETTER button. "Hold-and-set" operations are
also supported. The stop action's magnets can be fired with positive
or negative levels. The installer can regulate the duration of the magnet firing pulse and can
also control an
optional delay from piston press to magnet firing so that the stop will move in
unison with the existing stops.
The inputs at the bottom edge of the board can be via several types of terminal blocks or
by direct soldering
to the circuit board. From left to right, this prototype board has
large screw terminal blocks, pads for
direct solder connection, small terminal blocks, and then two types of
"spring clamp" terminals that grasp the wire with jaws that can be
opened by use of a small screwdriver pressed against the orange lever or
into the slot above the wire entry point. Other terminals can be used as long as
they match the .200" hole spacing.
The left-most 19 positions are for pistons 1 through 16, a separate reversible piston, SET, and
CANCEL. They can be wired in parallel with an existing combination action.
The right-most 5 positions are for the stop's contact, the ON
magnet, the OFF magnet, ground, and the positive power supply. Two solid-state fuses
are provided, one for each magnet, and the board contains filter circuits so that
its inputs will not be triggered accidentally by random electrical noise that might
be present in the organ's existing control wiring. If more than 16 pistons need to be
used, then two or more Add-A-Stop boards can be installed, wiring in parallel for the SET,
CANCEL, stop contact, ON, and OFF connections.
Three LEDs show the status of the board and of the various inputs, helping the installer
prove that the
wiring is correct and that the unit is working properly. (No, the stop tab does
not come with the board!)
If you would like to read through a draft of the Add-A-Stop documentation, please
feel free to do so at this
location.
(This page was created on 5 Oct 2001 and updated on 11 Mar 2002.)