LEESON Chassis Mount PWM Control: 175292.00 - Manual (Page 33)

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Multiple fixed speeds
Replace the speed adjust potentiometer with series resistors
with a total series resistance of 10K ohms (Figure 14). Add a
single pole, multi-position switch with the correct number of
positions for the desired number of fixed speeds.
Figure 14. Multiple Fixed Speeds
S3
S2
S1
R1
R2
R4
TOTAL SERIES
RESISTANCE
10K OHMS R3
Application Notes