{"product_id":"under-speed-warning-alarm-for-magnetic-pickup-sensor-frequency-controlled-switch","title":"Under Speed Warning Alarm for Magnetic Pickup sensor – Frequency Controlled Switch","description":"\u003cp\u003eThis is an under-speed sensor module that provides an audible warning and signals output when the speed of a machine is below the set point. The module can be used in applications such as Engines, Machines, Sports machines, Fitness Equipment, Speed of the machine or engine can be detected using a magnetic pickup sensor. The project can be used in many applications where an under-speed monitor is important. The project is based on the \u003cstrong\u003eLM2907\u003c\/strong\u003e chip which works as a frequency to voltage converter, interfacing magnetic pickup as shown in the figure below. A typical magnetic pickup for automotive applications will provide a thousand pulses per mile so that at 60 mph the incoming frequency will be ~16.6 Hz. If the reference level on the comparator is set by two equal resistors R2 and R6 then the desired value of C5 and R4 can be determined from the simple relationship:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe buzzer is activated when Frequency ≥\u003c\/strong\u003e\u003cstrong\u003e (1\/(2XR4C5))\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFrom the RC selection chart, we can choose the suitable values for \u003cstrong\u003eR5\u003c\/strong\u003e and \u003cstrong\u003eC5\u003c\/strong\u003e. In the current circuit, the frequency is set to \u003cstrong\u003e500Hz\u003c\/strong\u003e approx. A frequency trigger point can be changed as per user requirement using the above equation. The module supports any sensor with voltage levels \u003cstrong\u003e20mV to 28V\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSupply 12 to 15V DC @ 20mA\u003c\/li\u003e\n\u003cli\u003eOptimized for Magnetic Pickup Sensor\u003c\/li\u003e\n\u003cli\u003eOther Optical Sensors, Mechanical sensors, Tachometer sensors can be used\u003c\/li\u003e\n\u003cli\u003eInputs Voltage Level 20mV to 28V\u003c\/li\u003e\n\u003cli\u003eBuzzer Operates when the Input frequency is below 500Hz\u003c\/li\u003e\n\u003cli\u003eProvide Low Output When Speed is below Setpoint\u003c\/li\u003e\n\u003cli\u003eHeader Connector for Supply Input and Output\u003c\/li\u003e\n\u003cli\u003e2 Pin Header for Sensor\u003c\/li\u003e\n\u003cli\u003eD1 Power LED\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 38.42 x 16.19 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEngines\u003c\/li\u003e\n\u003cli\u003eTachometer Under\/Over Speed\u003c\/li\u003e\n\u003cli\u003eFitness Equipment\u003c\/li\u003e\n\u003cli\u003eSports Machines\u003c\/li\u003e\n\u003cli\u003eMachine Automation\u003c\/li\u003e\n\u003cli\u003eAC\/DC Motor Speed Monitor\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47247242920108,"sku":"S142","price":8.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/S142A.jpg?v=1789812577","url":"https:\/\/dotfry.com\/products\/under-speed-warning-alarm-for-magnetic-pickup-sensor-frequency-controlled-switch","provider":"dotfry","version":"1.0","type":"link"}