PC/CP300 Electronics Laboratory II

Controlling Power Building Block

Build the following circuits on a two bus breadboard so that they can be saved for future use.

For both of the circuits required, you will need to demonstrate them operating with a control signal in series with a 10kΩ resistor, to show that the required control current is very small.
  1. Build a circuit to control a relay. The control signal should not have to be higher than 5V, and switching between 0 and 5 volts should turn the relay on and off. Be sure to use a 10V Zener diode as needed to reduce the back EMF.

  2. Build a circuit to control a DC motor. The control signal should not have to be higher than 5V, and a voltage of 2.5V should produce a motor speed that is clearly between the speed with a 5V control signal and stopped. A 0 volt signal should turn the motor off. Be sure to use a 10V Zener diode as needed to reduce the back EMF.

Demonstrate your working blocks at the next lab period.

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