We will set this voltage slightly lower than the reference voltage. It will compare voltage between the reference voltage of ZD1- 3.6 volts the Zener diode, and input voltage from pin 3 of IC1 this voltage is divided by resistor-R4 and VR1. There is an op-amp-IC1 as an input voltage comparator. Ideally, block diagram in Figure 1.įigure 1 the block diagram The working of the motor protection circuitįigure 2 is a schematic of this project. Until the voltage is restored to its original condition. And AC-line fall down lower than 10% of normal voltage the relay will cut off the load at once. Can be set to cut no-off in the voltage during the 168-227V.Īs AC main in normal level, the relay will be connect to apply AC line to motor. Relay will not work and the LED is a warning. The principle is simple, it will check for voltage at all times. It will protect the AC motor burn out. Because of under voltage input. Should be careful polarity of the diodes, Zener diodes, electrolytic capacitors types Induction Motor Protection Circuit and working All equipment will be soldered onto the PCB purpose. ZD2: 6.8V 0.5W Zener Diode C1: 470♟ 25V Electrolytic Capacitors C2,C3: 0.1♟ 63V Polyester Capacitor LED: as you like.IC2: LM7812_12V 1A DC voltage regulator.IC1: LM324_ Quad/ 1MHz/ Operational Amplifiers.LED1 display when power or low power over a specified. The two components can be specified by VR1, VR2. The IC2/2 serves to detect the lower voltage. Thus cutting off power from the load instantly. Pressure acts edge IC2/1 High Voltage Detector, High Voltage ICs, if this current work to the Q1 and relay function, it works with. Or input pin of IC1, a loan IC Rex bit computing to 12-volt power supply is fixed to the IC2. Then, through the C1 and C2 to the power filter smoothing. To convert the voltage, alternating current to direct current. It serves to reduce the pressure remaining 12 volts, through a D1-D4 connected to Direct rectifier bridge circuit. LOW – BATTERY INDICATOR USES FLEA POWER: - This is a low indicator that consumes as little power as possible for a 9V, 450-MAhr alkaline battery, a 50 – PA low battery indication can by itself run the battery down in a little more than a year battery – powered devices that need to run continuously for a long time require battery indicators that consume minimal power.From the circuit when the voltage is 220 volts AC through a transformer T1. LCD come in rather large panels that can display a line or two or text i.e they have ability to store several message and communicate via serial ports.Ĭ. An example is the HC4543, the LED cousin of the HC4511 LED latch/decoded driver. However, it driver chips have some way to generate a square – wave segment drive, synchronized to the LED backplane wave form. LIQUID CRYSTAL DISPLAY (LCO): - This is a display that is usually is a driven by an a.c wave form otherwise their liquid guts (contents) are ruined. No conductor or light emission occurs for reverse bias which if it exceeds 5V, may damage the LED.ī. When forward biased it emits red, yellow or green light depending on its exact composition. Typical flooded panel – type LED indicators look good at 10MA forward current on a board inside an instrument one can usually get away with 2.5MA, particularly if one use a narrow-angle LED. LIGHT – EMITTED DIODE (LED): - This is a junction diode made from the semiconductor gallium arsenide phosphide which has large band gap and hence a larger forward drop than silicon. The transistors T1, T2, T3 are low power transistors that control the flow of electron in the circuit VR1 is employed to vary the frequency of the power.Ģ.0 Circuit diagram of L.E.D Zener P.S.U 4Ī Low Power Indicator can be defined as an indicator that is having a very low electrical supply or current situated in an electrical instrument which indicates the amount of power present in the instrument by their colour indication be it red, yellow or green.Ī. A Low Power Indicator is a device that indicates by way of displaying light to indicate the level or strength of electrical power in a given circuit at a particular time.
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