Lesson 1 - Introduction to Oscillators


Oscillation; Oscillators and amplifiers; Classes of oscillators; Common oscillator circuits

Learning Objectives:
– Describe the conditions needed to start and to sustain oscillation.
– Explain how positive feedback affects oscillation.
– Name three kinds of feedback networks used in oscillators.
– Discuss the advantages and disadvantages of tuned circuits, phase-shift oscillators, and crystal oscillators.
– Describe several common oscillator circuits.

Lesson 2 - Flip-Flops


Square waves; Switching circuits; One-shots; Astable flip-flops (multivibrators); Frequency of multivibrators; Bistable flip-flops

Learning Objectives:
– Discuss the differences between sine wave oscillators and square wave switching circuits.
– Explain how rise time and the time constant affect flip-flop circuits.
– Compare the operation of discrete transistor one-shots and IC one-shots.
– Explain how IC pairs of one-shots or IC op amps form an astable multivibrator.
– Describe the operation of bistable flip-flops.

Lesson 3 - Logic Clocks


Combinational and synchronous logic; Clock conditioning; Schmitt trigger circuit; Frequency dividers; Multiphase and real world logic clocks

Learning Objectives:
– Compare combinational logic, synchronous logic, and sequential logic.
– Explain how logic clocks are generated.
– Explain how negative resistance enables the UJT relaxation oscillator to be used as a logic clock.
– Discuss the effect of hysteresis on logic clock operation and describe the operation of the Schmitt trigger circuit.
– Describe the operation of ripple counters and other frequency dividers.
– Discuss problems caused by real-world (nonideal) logic clocks.

Lesson 4 - Filters and Waveforms


Wave shaping; Simple, RC low-pass, RL low-pass, high-pass, band-pass, band-reject, and active filters; Time constants; Differentiators and integrators; Function generators

Learning Objectives:
– Discuss the composition of waveforms and explain how filters change the shapes of waveforms.
– Compare the frequency characteristics of low-pass and high-pass filters and of band-pass and band-reject filters.
– Discuss the calculation of time constants in timing circuits.
– Describe methods of creating and shaping complex waveforms, including the differentiator and integrator circuits.
– Explain briefly how digital waveforms are generated with a microprocessor.

Lesson 5 - Troubleshooting Oscillators


Test equipment; Tracing oscillator operation; Troubleshooting multivibrators, one-shots, flip-flops, sequential logic circuits, clocks, and filters

Learning Objectives:
– Discuss the basic requirements of four kinds of equipment used to test oscillators.
– Describe good general practices in troubleshooting oscillator components and circuits.
– Describe the steps in tracing oscillator circuit operation and selecting test points for monitoring waveforms.
– Discuss the steps in troubleshooting multivibrators, one-shots, and flip-flops.
– Discuss troubleshooting methods for sequential logic circuits, including clocks.
– Discuss troubleshooting methods for frequency dividers and filters.