![]() In group drag down, select group as sources–>Power sources and in component section ground. The ground terminal and the oscilloscope must be placed in the schematic capture to measure the frequency.Ĭlick on place, select components, select a component pop-up appears. The other end of R3 is connected to the C2 and then to the control voltage pin of the 555 timer. Connect the C1 terminal to the trigger pin and the threshold pin, the other end of the C1 terminal to the variable resistor R3. Place the 10-ohm variable resistor, on the schematic capture. Figure 10: Placing components in NI multisim In group drag down, select group as Basic–>Variable resistors and in component section 10 ohm. Click on place, select components, select a component pop-up appears. Place the 1uF capacitor, on the schematic capture. In group drag down, and select group as Basic–>Capacitors and in component section 1uF. Connect the threshold pin of the 555 timer to the trigger pin. The other end of the resistor to the discharge pin. Place the 10k resistor, connect the resistor to the Vdd and RST wire. Figure 8: Placing resistor component NI Multisim component selection In group drag down, and select group as Basic–> Resistors and in component section 10k. Move the cursor towards the reset pin, click on the pin, and drag the wire towards the Vcc pin.Ĭlick on place, select components, select a component pop-up appears. Click on that and drag the wire to the Vcc pin and click to complete the wire. Figure 6 : Placing source power Figure 7: Voltage source placementĬonnect the power source to the Vcc pin, when the cursor is placed on Vdd, the cursor would change to a plus symbol. Place the source VDD on the schematic capture, double click on VDD, and change the value to 6V. In group drag down and select sources, select power sources and component VDD. Figure 5: Placing component on schematicĬlick on place, select component, we will get select a component pop-up. Next, we must place the power source, resistors, capacitors, and variable resistors. Figure 4: Selecting Ideal 555 timerĭrop the 555 timer on the schematic capture window. ![]() Search result pop-up box appears, select 555_virtual and click ok. In component section type 555, click on search. The design requires 555 IC for this design, click on search, a component search pop-up appears. Start placing the components, click on place, then select components, we will get select a component pop-up. NI Multisim tutorial on frequency variation circuit using 555 timer The list of components used in this circuit design 555 IC, power source, resistors, capacitors, variable resistor, ground, and oscilloscope. Multisim is a suite of EDA tools that will assist design engineers in their circuit simulation and design flow. Let us start the circuit design using the multisim tool. The table below depicts various frequencies for different values of the variable resistor. This tutorial will help, how to simulate the circuit shown below using the NI multisim tool. To overcome this, we can use a variable resistor. If we change the value of resistors, the frequency varies at the cost of sacrificing the duty factor. In a traditional circuit design to keep the duty factor constant, and change the frequency continuously, can be achieved through a variable capacitor. In this circuit design tutorial, a 555 timer to be used for frequency variation circuit application. They find potential use in numerous applications such as time delays and oscillators. The 555 timer IC got the name due to the three 5 kilo-ohms resistors used in the voltage divider network. please tell me what's wrong with the circuit i copied.The 555 timer, one of the most frequently used integrated circuits by design engineers for novel circuit designs. I didnt know this is considered as spamming. I dont know the rules since I'm new so kindly bear with me. but there's no reading on wattmeter and the oscilloscope wave is also a problem shows square wave instead of sine wave, varies when I continually press switch (space). Okay I had it working now, but the wattmeter is my problem doesnt read power output! I connected the multimeter on Q1 (- and + of multimeter) and it reads okay. The one I made in the attachments is laserdiode.jpg and the schematic i copied is glpdrv4.gif. I will be making a laser diode as is in the schematic but since I need an oscilloscope to view the wave formed by the laser diode (green) I used NI MULTISIM. Im working on an experiment (that I dont know how to do so I'm finding ways). Where should I connect the terminals of oscilloscope to the laser diode? and where do I connect the multimeter. I'm not sure if I did things correctly I just copied the same exact schematic. I made a copied green laser diode from Sam's.
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