IED ELECTRONICSADVANCED SCR IMPROVISED ELECTRONICS LLC PROPRIETARY AND

IED ELECTRONICS-ADVANCED SCR IMPROVISED ELECTRONICS, LLC : : PROPRIETARY AND CONFIDENTIAL

LEARNING OBJECTIVES • Terminal Learning Objective – Explain how SCRs are used in the electrical circuit of an IED • Enabling Objectives – Discuss how SCRs are used in an electrical circuit of an IED – Identify the schematic symbol of a SCR – Identify the legs of a SCR – Describe the function of a SCR – Determine how SCRs are configured in an IED circuit

• • SCR, Thyristor Has “latching” feature when turned on Very small amounts of current Three legs A – Cathode – Anode – Gate • T 0 -225 C 106 D SILICON CONTROLLED RECTIFIER A K A G G G K K

RECOVERED EVIDENCE

CASIO WATCH • Ramzi Yousef made them famous with his “Casio Watch Device. ” 5

SCR AND A WATCH (THAILAND) 6

TIMER CIRCUIT

INDONESIA SCR CIRCUIT

INDONESIA LIGHT SENSOR

DARK SENSOR

RC FIRED SCR

PHILIPPINES DUAL SCR RCIED Isabella City, Basilan 31 May 2012

PHILIPPINES DUAL SCR RCIED

SINGLE WIRE COMMAND WIRE

SUMMARY • Terminal Learning Objective – Explain how SCRs are used in the electrical circuit of an IED • Enabling Objectives – Discuss how SCRs are used in an electrical circuit of an IED – Identify the schematic symbol of a SCR – Identify the legs of a SCR – Describe the function of a SCR – Determine how SCRs are configured in an IED circuit

Questions?