SCR Applications

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This well laid out Experiment Card is divided into 5 distinct circuit areas and enables the learner to explore SCR and UJT devices and their applications.

Typical topic areas include:

• Silicon Controlled Rectifier
• Capacitor Commutation of an SCR Circuit
• AC Applied to an SCR
• UJT Oscillator
• UJT SCR Control
• Troubleshooting an AC Phase Control Circuit
• The Triac and Diac

Typical activities include:

• Identify the construction and operation of an SCR.
• Investigate the SCR’s basic operation and latching action.
• Recognise the operation of a simple SCR capacitor commutation circuit.
• Investigate the operation of a capacitor commutation circuit.
• Identify the operation of an SCR with DC triggering.
• Identify the operation of an SCR with AC phase control triggering.
• Investigate the operation of an SCR with DC triggering.
• Investigate SCR AC phase control with a CR circuit.
• Recognise the operation of a UJT and a UJT relaxation oscillator.
• Investigate a UJT relaxation oscillator.
• Investigate an AC phase control circuit using a UJT.
• Troubleshoot a fault in a UJT AC phase control circuit.
• Identify the construction and operation of a Triac.
• Identify the operation of a circuit that uses a Diac to trigger a Triac.

This resource includes:

• Experiment Card
• Assignment Guide
• Storage Case