Page 33 - The Basics IA by ETron Circuit Labs

Here’s What You’ll Need...SCRGate Anode Cathodehole 4d hole 5d hole 6dR3R2 R1D1RESISTORhole 7chole 8c220 Ohm - (Red, Red, Brown, Gold)AnodeC1DISC CAPACITORShole 13ehole 21chole 30c3.3K % (Orange, Orange, Red, Gold) DIODEhole 17bhole 30b6.8K & (Blue, Gray, Red, Gold) hole 13d CathodeAnodehole 21d AnodeCathode GateSCR - Silicon Controlled Rectifier a b c d e 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 a b c d e f g h i j 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 f g h i j 104 0.1uF Anodehole 13gLIGHT EMITTING DIODE (LED)CathodeLED 1Cathode (flat side)hole 7b hole 5bREDBLACKB1red = hole 30d black = hole 30gWIRESW1 = 8a & 30a W2 = 21j & 30j W3 = 6e & 21i W4 = 13j & 21h W5 = 4e & 13cSCAN HERE TO SEE MORE ONLINEInsert a single wire into each of the following holes: N/C Switch = 21f & 21e, N/O Switch = 17a & 13b, Buzzer 5e & 8e.31stop the SCR from conducting, once it has started to conduct, is to remove power from the circuit.As such even if the sensor switches S1 or S2 are opened or closed again, the alarm will not turn off. The only way to reset the alarm is to disconnect the battery.Procedure:Assemble the circuit and connect a 9-volt battery to the Battery Snap and with switch S1 in the open position (wires not touching) and with switch S2 in the closed position (wires touching), the LED should NOT be lit.Close switch S1 by touching the two wires. The LED should light up and remain lit until you disconnect the battery. If you open switch S2 (by disconnecting the two wires that are touching), the LED will also light up and remain lit until power is removed from the circuit.Check Your Work HereLAB 16AnodeVisit us online at www.ETronCircuit.com for more exciting projectsDid you know...This is an excellent burglar alarm circuit for normally-closed and normally-open alarm systems.