EGR203 Electric and Electronic Circuits Assignment 6

  1. Find the average value and rms value of the signal below.

  2. An ideal ac current source is applied to the input terminals of an amplifier, and the amplifier output voltage is 2 V rms. Then a 2-kΩ resistance is placed in parallel with the current source, and the output voltage is 1.5 V rms. Determine the input resistance of the amplifier.

  3. We need to design an amplifier for use in recording a short-circuit current of experimental electrochemical cells versus time. (For this purpose, a short circuit is any resistance less than 10 Ω.) The amplifier output is to be applied to a strip chart recorder that deflects 1 cm ±1 percent for each volt applied. The input resistance of the recorder is unknown and likely to be variable, but it is greater than 10 kΩ. A deflection of 1 cm per milliampere of cell current with an accuracy of about ±3 percent is desired. What type of ideal amplifier is best suited for this application? Using your best judgement, find specifications for the amplifier's input resistance, output resistance, and gain.

  4. Given the following amplifier circuit:

    Assume Vs = 10 mV, Rs = 10 kΩ, Ri = 90 kΩ, A = 1000, Ro = 50 Ω, and RL = 50 Ω

    Find the load voltage and load current, the input voltage, and the voltage gain.

  5. Add a feedback system with R1 = 40 kΩ, and R2 = 10 kΩ, as shown below:

    Find the load voltage and load current, the input voltage, and the voltage gain.

  6. Simulate the circuit above in Multisim and verify your calculations for that problem.

  7. Reproduce the Multisim simulation of a 4-bit ripple counter using D flip-flops, as shown below. Use different colors than shown here for the hex display and digital probes.

Maintained by John Loomis, last updated 18 October 2010