Page 46 - Robots Androids and Animatrons : 12 Incredible Projects You Can Build

+Vcc
+Vcc
R2 +Vcc +Vcc +Vcc
4.7KΩ
Motor Solar
Cell
y
R1 UJT
100KΩ Q1 + C2
SCR
4700 F
5V

+ C1
R3
22 F 2.2KΩ
5V

3.1 Schematic for solar engine

list) has a PCB included. Figure 3.3 shows the PCB parts place-
ment. The complete solar engine is shown in Fig. 3.4. 25
Parts list for solar engine
(1) 2N2646 UJT transistor
(1) 2N5060 SCR
(1) 22- F cap
(1) 0.33-F cap
(1) DC motor
(2) Solar cells
(1) PCB
(1) R1 200K ohm, 4 watt (W)
1
1
(1) R2 15K ohm, 4 W
1
(1) R3 2.2K ohm, 4 W
High-efficiency motor

Not all electric motors are HE. For instance, the small electric
motors sold at your local Radio Shack are of the low-efficiency
type. There is a simple way to determine if a motor is an HE type.
Spin the rotor of the motor. If it spins smoothly and continues to
spin momentarily when it is released, it is probably an HE type.

Team LRN Power