1. IED Electronics-Advanced SCR

2. 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

3. Silicon controlled rectifier • SCR, Thyristor • Has “latching” feature when turned on • Very small amounts of current • Three legs • Cathode • Anode • Gate • T0-225 C106D A A K K A K G G G

4. Recovered Evidence

5. Casio Watch • RamziYousef made them famous with his “Casio Watch Device.”

6. SCR and a Watch (Thailand)

7. Timer Circuit

8. Indonesia SCR Circuit

9. Indonesia light sensor

10. Dark Sensor

11. RC Fired SCR

12. Philippines Dual SCR RCIED Isabella City, Basilan 31 May 2012

13. Philippines Dual SCR RCIED

14. Single Wire Command WIre

15. 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

16. Questions?