Can You Solve This? Questions
Oscillators
  1. Hartley: A Hartley oscillator has L1 = 33 mH, L2 = 3.3 mH, and C = 100 pF. What is the resonant frequency? Answer
  2. Clapp A Clapp oscillator has C1 = 1 nF, C2 = 10 nF, C3 = 50 nF, and L = 15 H. What is the resonant frequency? Answer
  3. Relaxation: A relaxation oscillator has R1 = 18 kohms, R2 = 2 kohms, R = 1 kohm, C = 100 nF, and Vsat = 14 V. What is does the upper trip point equal? The period of the oscillator output signal? Answer
  4. Wien-bridge: A Wien-bridge oscillator has R = 10 kohms and C = 10 nF. The resonant frequency? Answer
  5. 555 Timer: An astable 555 timer has R1 = 75 kohms, R2 = 30 kohms, C = 47 nF, and VCC = 12 V. What does the output look like? What is its frequency? Answer
Power Supplies
  1. Transformer: The secondary winding produces a Thevenin voltage of 19 VAC and has a Thevenin resistance of 40 ohms. If a load resistance of 150 ohms is connected across the secondary, what is the load current? The load voltage? Answer
  2. Half-wave Rectifier: A half-wave rectifier with a capacitor-input filter is driven by a secondary winding with a Thevenin voltage of 20 VAC and a Thevenin resistance of 40 ohms. If the capacitance is 470 microfarads and the load resistance is 750 ohms, what is the dc load current? The dc load voltage? The ripple voltage? Answer
  3. Full-wave Rectifier: A full-wave rectifier with a capacitor-input filter is driven by a secondary winding with a Thevenin voltage of 20 VAC and a Thevenin resistance of 40 ohms. If the capacitance is 330 microfarads and the load resistance is 500 ohms, what is the dc load current? The dc load voltage? The ripple voltage? Answer
  4. Bridge Rectifier: A bridge rectifier with a capacitor-input filter is driven by a secondary winding with a Thevenin voltage of 20 VAC and a Thevenin resistance of 40 ohms. If the capacitance is 330 microfarads and the load resistance is 400 ohms, what is the dc load current? The dc load voltage? The ripple voltage? Answer
Regulators
  1. Zener Regulator: A zener regulator has an input voltage of 15 V, a zener voltage of 6.2 V, a zener resistance of 7 ohms, a series resistance of 330 ohms, and a load resistance of 470 ohms. What is the load voltage and load current? Answer
  2. LM7805: An LM7805 has an input voltage of 10 V, an input ripple of 1 V, a load resistance of 10 ohms, and a ripple rejection of 68 dB. What is the output voltage and the output ripple? Answer
  3. Zener Follower: A zener follower has an input voltage of 15 V, a zener voltage of 10.2 V, a zener resistance of 124 ohms, and a zener current of 6.82 mA. If the load resistance is 10 ohms, what is the load voltage and load current? Answer
  4. Zener Follower with Darlington: A zener follower uses a Darlington pair for the pass transistor. It has an input voltage of 15 V. If the base voltage to the first transistor is 10.4 V, what is the output voltage? Answer
Voltage Amplifiers
  1. Without Local Feedback: A base-biased amplifier has an internal emitter resistance re' of 3.85 ohms, an ac load resistance rc of 800 ohms, and an ac base voltage of 1 mV. What is the voltage gain and the ac output voltage? Answer
  2. With Local Feedback: A base-biased amplifier has a local feedback resistance RE of 50 ohms, an internal emitter resistance re' of 3.93 ohms, an ac load resistance rc of 800 ohms, and an ac base voltage of 232 mV. What is the voltage gain and the ac output voltage? Answer
  3. Small-signal JFET Amplifier: A JFET amplifier has a transconductance gm of 1.88 mmhos, a drain resistance of 6.8 kohms, and an ac gate voltage of 1 mV. What is the voltage gain and the ac output voltage? Answer
  4. Darlington Amplifier: A circuit uses a Darlington pair with the beta of the first transistor equal to 200 and the beta of the second transistor equal to 50. If the ac load resistance is 50 ohms in parallel with 39 ohms, what is the input impedance of the Darlington amplifier? Answer
  5. Two-stage Amplifier: An amplifier has a first stage with a voltage gain of 34.3 and a second stage with a voltage gain of 115. If the ac input voltage to the first stage is 0.628 mV, what is the voltage gain and the ac output voltage? Answer

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