Manual Servo Driver Circuit
R1
18K
P1
50K
R2
680K
48
To servo
D1
1N4148
2
7
65
1
IC1
LM555
3
Signal
Vin
4.5V–
6.0V
C1
0.033μF
C2
0.1μF
B
Function 1
Servo 1
WR B
Servo 2
WRB
Single Driver Circuit for Multiple Servos
Function 2
2-pole rotary switch
selects desired servo
( 2 positions shown)
A1
A2
B2
B1
+5V
Common
D
Manual Servo
Driver Circuit
Manual
control knob
sets servo arm
position
W = Signal
R = +5V
B = Common
Note:
All commons
can be fixed
5V DC
power supply
Function
External detector
signal input
Servo
WRB
Relay activated by
external detector
function
N/O
COM
N/C
Manual override
position switch
Toggle switch
(center off)
+5V Common
5V DC
power
supply
E
C
G
Dual servo driver circuit F
Position 1
Signal
Position 2
Signal
Preset signals for
Position 2 Position 1
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