Outputs such as motors and solenoids can be added to the 4017B circuit quite easily. LEDs are simply replaced with a low power motor (quality solar motor recommended). The motor must be capable of working with a maximum of 3v. However, if a more powerful motor or a solenoid is required a transducer module can be used. Watch outputs 'A' and 'D', these have a solar motor and solenoid attached.

The high power transistor TIP 31A is ideal for this circuit. The connections are shown above. A motor, solenoid or other output device can be connected. Normally a 9 volts secondary power source is used, especially for school projects.
Alternatively, if the output rail of the 4017B is connected to the gate of a FET or the base of a transistor such as a BFY51, every time any output is switched on, the transistor will be switched and the motor will revolve. A separate transistor circuit is shown below.

QUESTIONS:

1. Build a 4017B circuit using a breadboard and components OR simulation software such as Crocodile Technology. Add a solar motor and solenoid as shown in the animation above.

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