Multiple fixed speeds
Replace the speed adjust potentiometer with series resistors having a total series
resistance of 10K ohms (Figure 13). Add a single pole, multi-position switch with the
correct number of positions for the desired number of fixed speeds.
2 8
Application Notes
R 4
Total Series
Resistance
10K Ohm
R 1
R 2
R 3
S3
S2
S1
Figure 13. Multiple Fixed Speeds
S3
R1
R2
R3
R4
TOTAL SERIES
RESISTANCE
10K OHM
S2
S1
