| OBJECTIVES |
- Measure and sketch the optocoupler characteristics (output current as a
function of input current).
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- Examine the frequency response of the optocoupler.
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- Examine the isolating features of the optocoupler.
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- Troubleshoot the optocoupler.
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- Understand P.U.T. operation and biasing.
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- Measure P.U.T. characteristics and determine P.U.T. parameters (voltage,
current).
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- Construct P.U.T. oscillator.
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- Troubleshoot P.U.T. circuits.
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- Understand the internal structure of 555 timer and its basic operation
principles.
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- Construct a stable multivibrator using a 555 timer.
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- Construct and trigger monostable
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- Multivibrator built from 555 timer.
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- Troubleshoot 555-timer circuit.
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- Understand the internal structure of triac and its condition for
operation.
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- Measure triac typical parameters.
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- Understand triac's phase control circuit principle.
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- Construct light dimmer with triac.
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- Troubleshoot triac circuits.
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- Identify the test points in the complete circuit.
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- Measure key voltages in the circuit.
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- Use signal tracing to isolate defective stages or blocks.
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- Locate faulty components within a stage.
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