tachometer circuit consists of two stages. In the first stage monostable wired around IC NE555 is used, and in the -digit counter IC 74C926 is used for the construction of the tachometer. A 5V regulated power supply circuit and an infrared light source circuit are also used. The instrument can measure speed upto 9999 RPM. [6] 2 Wire the meter. See the wiring diagrams beginning on page 3. If the wire diagram is larger than the wire, use only approved adapters. External meter wiring should be consistent with the meter class 4 wire delta meters CIRCUIT CLOSING DEVICE 1 2 3 N 3 2 1 N Form 10S (Form 8S application) 3 phase, 4 wire delta, 3 CTs, no PTs 20E01 0-30V Power supply circuit schematic. 1.25V - 25V adjustable regulator circuit. 12V fan on 230V circuit. 12V to 24V DC converter power supply circuit diagram. 24V to 220V 1000W DC AC sine wave inverter for photovoltaic solar system. 5V to 8V DC converter power supply circuit diagram. Inverter 12V to 220V. The circuit diagram of the digital tachometer using arduino is shown below. Circuit diagram. RPM Sensor. An IR photo transistor and IR LED forms the sensor. IR photo transistor is a type of photo transistor which responds to infra-red waves only. The use of IR phototransistor avoids other light interferences from the environment. NOTE: The Digital Multimeter is equipped with two fuses to prevent damage to the meter in the event that the input limits are exceeded. If the meter displays a reading of 0.00 when testing 12 volt starter motor current draw or DC amperage output, check fuses in meter. Refer to FLUKE Operator's Manual for procedure for checking fuse. rpm = (1000/timetaken) * 60; Where (1000/timetaken) gives the rps (Revolutions per second) and it is multiplied by 60 to convert rps to rpm (Revolutions per minute). Now to calculate the velocity of the vehicle we have to know the radius of the wheel. In our project we have used a small toy wheel which has a radius of just 3cm. 3. Should not be used on electronic circuits Digital Multimeter Digital-Volt-Ohm meter (DVOM) Features: 1. Voltage (Pressure) testing. 2. Amperage (Flow) testing. 3. Resistance (Restriction) testing. 4. Diode (Check valve) testing. Many of these meters are auto-ranging. Digital multimeters are high impedance to protect sensitive circuitry. NITA. 270 MINI ELECTRONICS PROJECT WITH CIRCUIT. D IAGRAM. This Book is writ ten for all the people who love innovation. It is the big collection of ideas to do. some innovative project, to make (See diagram) QUICk SET OPTIONS: Remove RPM Display - Sometimes fewer distractions are better for a driver. If you want to be able to focus on just the shift light when you're making a performance run and don't want to be distracted by the digital RPM display, you can disable the display function. To turn on/off the display function, press Contactless tachometer circuit diagram Speed measurement circuit is given below. output of optical sensor is connected with RA4/T0CLK pin which is input of timer zero when it is used as a counter. Pulse width modulation is used to change speed of dc motor. So we are using CCP1 module of PIC microcontroller. Circuit Diagram and Explanation As shown in the above tachometer circuit, it contains Arduino Pro Mini, IR sensor module, buzzer and LCD. Arduino controls the whole process like reading pulse that IR sensor module generate according to object detection, calculating RPM and sendi