WIRING A SCALE SHOPS TURNOUT MACHINE
UNDER THE LAYOUT
12 TO 16 VOLTS AC FROM A POWER PACK OR RADIO SHACK #273-1352
10 OHM, 10 WATT CERAMIC RESISTOR RADIO SHACK #271-132
BUSS BAR TERMINAL STRIP FOR CONVENIENTLY ROUTING POWER TO OTHER MOTORS
SP DT TOGGLE SWITCH
2 DIODES Each pair of diodes are reversed and twisted together on one end where the wire from the power supply.
CONTAINS ALL PARTS FOR CIRCUIT
HOW THE CIRCUIT WORKS
The diodes rectify the AC into half wave pulse DC. The DC motor changes direction with the throw of the toggle switch because the diodes change the polarity. This means that the total circuit changes polarity with the throw of the toggle as the reversed diodes allow a path for either direction of current flow.
One wire runs from the 12 to 16-volt power supply to the control panel. Power will flow through one of the diodes and out the center post of the SP DT toggle switch. This wire connects to the two diodes twisted together at the turnout motor. One of the diodes will conduct to whichever set of points are closed. Now a path of the correct polarity will run the motor in the other direction. The motor circuit returns to the optional buss terminal strip, 10-ohm resistor, and another terminal on the power supply.