Below are photos and the schematic for the HexFet board. It can be interfaced with the CT-1 controller to provide direct control of DC motors.  The supply voltage for the motors is applied to the board and the outputs from the board connect to the motors.  The board has 4 channels, UP, DOWN, CW and CCW.  There are inputs provided for push button switches to manually control the motors, and there is safety lockout circuitry on the board to prevent trying to activate both directions at once.  These Hex FET's can handle current up to 20 amps.

In addition to motor control, the board also passes through signals, from the CT-1 controller board, for A/D position readout and motor speed control.

 

HEXFET board wiring
On the hexfet board the motor connection is to the solder lug on each pair of   hexfets.  Do not solder until you are sure of direction of the motors or bring out to a strip so wires can be reversed.

The board is the source of +13v (W1) Ground (W2) INPUT from POWER SUPPLY voltage to run the controller via using the DIN8 plug and cable you assemble.

The Din 8 cable is wired so that each pin 1 through 8 connects to the corresponding pin 1-8 on the hexfet board.

Be sure to FUSE each of the motor supply voltages into the board.
The hexfets switch on very hard (fast), much faster than a relay, for example.

Motor supply wiring:

AZ:    Ground next to the R23, motor SUPPLY (+) is next to R24
EL:    Ground next to W5, motor SUPPLY (+) is next to R3

Note: Motor reversal will draw extremely high amperage if motor is still turning when direction is reversed.  This will be several times more than the normal motor current.  So you should always allow motors to stop before reversing direction.  (When using manual switches, the controller will do this for you automatically.)

 

WIRING MANUAL SWITCHES

If you want to have switch's installed to manual control the motors, use (con1) or (con1A) for switch to ground, and we recommend to use three position toggle switches, spring loaded, with center off.  If not you   ** "WILL" forget **    and cause disaster at the antenna and cables.

 Use 2 of these three position switches.  One switch will be for CW and CCW, and the other will be for Up and Down.

 

 

Schematic of the HEX-1 Board. (Full size schematic below).