jared dunn
New Member
so I bought a pack of cadmium sulfide photocells. want to use them to control motor speed based on light intensity. I tested them using my ohmmeter. Everything works fine. I tested my motor usin a 1.5 volt dc battery. however when i connect the cell in series with the motor, i cant get any power flow regardless of light intensity. can anyone tell me why? i thought that maybe if i used a NPN bipolar transistor and connected the cell to the base and the motor to the emmitter then maybe the amplified signal would drive the motor but NO. so then i switched the motor to the collector and still no current. WHYWHYWHY?????