2
figure 1
– connections to PCB ass’y
CONNECTIONS TO TERMINALS
1 - speed control voltage input
- 851HS handset yellow or white
2 - direction control voltage input
- 851HS handset green
3 -12VDC handset supply
- 851HS red
4 - handset ground
- 851HS black
5 - AC/DC supply terminal
6 - AC/DC supply terminal
7 - track voltage
8 - track voltage
Note - Terminals are numbered on the
bottom of the PCB assembly
HANDSET DIAGRAMS
These schematic diagrams outline different handset configurations should you decide to construct
your own handset. The standard configuration of the 851HS is shown in
figure 2
. Variations of
this configuration are shown in
figure 3
. When constructing your own handset be sure to follow
standard electronics soldering practices. Always use a clean soldering iron and NEVER use acid
core solder or acid flux. Inspect your work to ensure solder joints are clean, smooth and shiny
and that connections go to where they are intended.
Part values shown are not “carved in stone”. Feel free to experiment with these values. The only
caveat is that the “speed” control’s value must not be below 5KOhm or above 50KOhm and it
must also be a “linear taper” potentiometer.
figure 2- 821HS standard handset configuration
