Sr200p Sony Region Free

plate circuit diagram and components phototropism.

works this way: the double switch is activated the two circuits are closed. The first circuit drives the motor 2 of a wheel continuously. When there is low light LDR resistance and not allow current circular. If there is light the RDA allows the passage of current and drives the transistor. Thus allows the passage of current through the collector and therefore the motor 1.

Circuit Components:

double switch.











Photocell LDR.

diode.








1k ohm resistor.








10k ohm potentiometer.









Transistor TIP 120.

Battery holder for two 1.5 V batteries size AA.


















Created by Lucia and Marta Castañeda Lorente.