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The Light alarm utilizes a LDR That Triggers the BC557 PNP Transistor.When triggered by light the circuit will buzz for a pre-detirmined time. 9-12Vdc
12VDC TEMPERATURE CONTROLLER BOARD | XH-W1209
DC-DC BUCK CONVERTER LM2596S STEP-DOWN MODULE
DC-DC BUCK CONVERTER XL4015 STEP-DOWN MODULE
EFK 12000 Just Whistle
EFK 12001 Infra -Red Link
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