Minarik MM20000A Series - Multiple Fixed Speeds; Figure 13. Multiple Fixed Speeds

32 Application Notes
Multiple fixed speeds
Replace the speed adjust potentiometer with series resistors
with 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.
R4
Total Series
Resistance
10K Ohm
R1
R2
R3
S3
S2
S1
Figure 13. Multiple Fixed Speeds