Specification Brand : Midzooparts BulletPoint : Infrared induction alarm DIY Kit electronic DIY production kit bulk electronic welding practice training BulletPoint1 : High reliability. BulletPoint2 : 2.54mm Lead spacing. BulletPoint3 : Low forward voltage. BulletPoint4 : Good spectral matching to Si photodetector. BulletPoint5 : Pb Free. Color : IR Receinver ConnectivityTechnology : Infrared CurrentRating : 10 amps ExternallyAssignedProductIdentifier : 4653017442712 ExternallyAssignedProductIdentifier1 : 0609843718525 ExternallyAssignedProductIdentifier2 : 609843718525 ItemName : Infrared Induction Alarm DIY Kit Electronic DIY Production kit Bulk Electronic Welding Practice Training ItemPackageDimensions_Height : 0.4 inches ItemPackageDimensions_Length : 5.5 inches ItemPackageDimensions_Width : 4.3 inches ItemPackageQuantity : 1 ItemTypeKeyword : infrared-emitters Manufacturer : Midzooparts Material : Copper MaximumSwitchingCurrent : 10 amps MaximumSwitchingVoltage : 12 volts ModelName : JTSF9648 ModelNumber : 151-99007G NumberOfItems : 1 OperationMode : Automatic PartNumber : XHLModulepart_11594 PhotoFilterEffectType : Infrared ProductDescription : working principle:When the 5V DC power supply is connected, D1 infrared emitting diode emits infrared, which can not be seen by human eyes. If D1 is not blocked by hand at this time, D2 infrared receiving diode (black) does not receive infrared light, and D2 infrared receiving diode will be in the reverse cut-off state, so the voltage of D2 negative electrode of infrared receiving diode is still high, and sent to the three pins of LM393. The voltage of the two pins of LM393 depends on the adjustable resistance R2. As long as the adjustable resistance R3 is adjusted to the appropriate voltage (the voltage of the two pins of LM393 measured with a multimeter is about 2.5V), the voltage of the three pins of LM393 can be ensured to be greater than that of the two pins of LM393,, When V + > V -, one pin of LM393 will output high level and send it to the base of PNP triode VT1 and vt2 through current limiting resistor R3, causing triode VT1 and vt2 to cut off, buzzer B1 will not sound and led LED1 will be off.When you approach the infrared emitting diode D1 with your hand, the infrared light is blocked and reflected, and is received by the infrared receiving diode D2. D2 turns on immediately, causing the voltage of the negative electrode of the infrared receiving tube D2 to drop rapidly, and the voltage is sent to the three pins of LM393. According to the working principle of the comparator, when V + < V -,One pin of LM393 will output low level, which is sent to the base of PNP triode VT1 and vt2 through current limiting resistor R3, causing triode VT1 and vt2 to turn on, buzzer B1 to sound, and led LED1 to light up. Precautions for production: 1. The welding time should not be too long, 1-3 seconds, otherwise the copper will fall off, once not welded, take off the soldering iron and weld again. Be sure to pay attention to the production of pictures and text, distinguish the positive and negative! Pay attention to the white silk screen welding of the corresp ProductSiteLaunchDate : 2021-12-23T17:50:57.632Z Size : Small Style : Modern UnitCount : 1 UnspscCode : 39120000 WaterResistanceLevel : not_water_resistant Wattage : 100 watts WirelessCommStandard : infrared