ECE 323L Basic Electronic Circuits Laboratory

Lab 3

 

 

Name:

 

 

 

Do the following exercises. Report your results by editing this Word document and submitting it in WebCT.

 

 

  1. Build a circuit that turns an LED on in the dark and off in the light. (automatic night light).  Use a Wheatstone bridge with your photocell as one of the resistors. Select identical resistors for the other three elements of the bridge. Choose a resistance value at your desired switch point.  Connect the output of the Wheatstone bridge to one of the op-amps in a Quad Op-Amp LM348 chip. Demonstrate your circuit to the instructor or teaching assistant.

 

 

 

 

  1. Layout the following circuit in Multisim. Use a measurement probe to find the current flowing in the circuit when the switch is closed. Include in your report a screen shot showing your circuit and measurement probe.

 

 

 

Current

 

 

 

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3. Connect an Agilent virtual function generator to an Agilent virtual oscilloscope in Multisim.  Set the function generator to output a 2 V p-to-p sine wave at 1 kHz frequency. Use the scope measurement feature to display the frequency and peak-to-peak voltage. Add your name as an annotation to the schematic.  Include in your report a screen shot of the result in your report (see example below).

 

 

 

 

 

 

maintained by John Loomis, updated 3 September 2007