Terminal Learning Objective
- Explain how relays are used in the electrical circuit of an IED
Enabling Objectives
- Describe how relays are used in an electrical circuit
- Recognize the schematic symbol for a relay
- Discuss how relays are configured in an IED circuit
Lessons
Relays Lecture
Command Wire with Relay
Lab Overview Students will build a Command Wire Relay device. They will then configure the hardware to suit their training needs. Tools / Parts / Test Equipment Soldering Iron Helping Hands Solder Multimeter
Collapsing Circuit
Lab Overview A collapsing circuit uses the normally closed switch and coil of the relay (RY1) and two batteries as separate circuits (e.g., the coil control circuit and the firing circuit) that are connected to the coil and switch sides of the relay, respectively. Tools / Parts / Test Equipment Soldering Iron Helping Hands Solder […]
Collapsing Circuit – Dual Out
Lab Overview A collapsing circuit uses the normally closed switch and the coil of the relay (RY1) and two batteries as separate circuits (e.g., the coil control circuit and the firing circuit) that are connected to the coil and switch sides of the relay, respectively. The circuit fires when the battery on the coil control […]
Fake Det Cord Collapsing Circuit
Lab Overview This is a copy of an actual device found in Iraq used by ISIS. This device shows that ISIS watches the Tactics, Techniques, and Procedures (TTP) of Iraq Security Forces (ISF) and is prepared to exploit any perceived weakness. Tools / Parts / Test Equipment Soldering Iron Helping Hands Solder Multimeter
Colombian Collar Bomb 1 – Switch Arm
Lab Overview This circuit is like the Colombian Collar Bomb 1, except it has the ability to use or not to use an arm LED (LED1) indicator without a pull-down resistor. Tools / Parts / Test Equipment Soldering Iron Helping Hands Solder Multimeter
Colombian Collar Bomb Breakout
Lab Overview This circuit is like the collapsing circuit; except we have included a trap switch (SW1) to use as a victim operated switch. The circuit is essentially two circuits. The control circuit consists of the battery (B2), a diode (D1), the relay coil (RY1) and R1. The firing circuit consists of the switch side […]
Colombian Collar Bomb 3 – Switch
Lab Overview This circuit is like the Colombian Collar Bomb 1, except that there are three switches and a place to use/not use an arm LED (LED1) with no pull-down resistor. This circuit is like the collapsing circuit, except we have included a trap switch (SW1/SW2/SW3) to use as a victim operated switch. The circuit […]
Colombian Collar Bomb 5 – Switch
Lab Overview This circuit is like the Columbian Collar Bomb 1, except that there are now five switches and a place to use/not use an arm LED (LED1) with no pull-down resistor. This circuit is like the collapsing circuit, except we have included a trap switch (SW1/SW2/SW3/SW4/SW5) to use as a victim operated switch. The […]
