Project Procedure (To Be Done on Project Board)

  Do NOT dismantle this circuit when you are through with this exercise. You should keep the entire circuit, including the op-amp IC, on your project board.

For the wireless control system we will be using operational amplifiers in two of the three configurations presented: non-inverting amp and as a comparator. After the signal is received by the receiver, it will be converted from AC to DC (a later experiment). This DC value will be small, under 500 mV, and will need to be amplified in order to be useful. For that purpose, we will use a non-inverting op-amp configuration. The output of the amplifier will then be used as the input to a circuit which will control a servomotor, causing the servomotor to rotate. The servo controller utilizes a comparator.

You will now design and built a non-inverting amplifier circuit.

1. Build the power splitter shown in Figure on your project board.
2. Select resistors which will provide a gain of 10 for your amplifier.
3. Measure and record the values of the resistors you have chosen.
4. Assemble a non-inverting amplifier circuit as was done in the previous section.
5. From the power splitter on your project board, connect to +10 volts and to -10 volts.
   Note: since we are amplifying a DC voltage, we will not need more than a -2 to +10 volt power supply, however for simplicity we have constructed the power supply with a -10 to 10 volt range.
6. Test the circuit by providing a small voltage to the non-inverting input of the amplifier. Verify that the gain of the amplifier is approximately equal to the theoretical gain.

Analyze this circuit in your lab report to verify that it will amplify a small positive DC voltage by a factor of 10.