Manual

27
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
S
1
R1
R2
R4
TO
TAL
S
ERIE
S
RE
S
I
S
TAN
CE
10
K
O
HM
S
R
3
Application Notes