Creating the First PCB project
Starting with LTSpice
In this post, we are going to make mono-stable multi-vibrator in LTspice for simulation.
The 555 Timer is a highly stable integrated circuit that can produce accurate time delays and oscillations. The 555 Timer has three operating modes, bi-stable, mono-stable and astable mode.
555 IC in its mono-stable mode has one stable state in which it can remain indefinitely. When a trigger pulse is applied to this mono-stable multi-vibrator, it switches to another quasi-stable state for a given time interval (let say T) and then reverts back to the original stable state. As it switches to the quasi-stable state once, for a single input trigger pulse, this circuit is also known as One-Shot. The duration ‘T’ for which the one-shot remains in the quasi-stable state is independent of the triggering pulse and can be adjusted using parameters such as resistor and capacitors.
Steps to create a new project:
Get TechJammers’s stories in your inbox
Join Medium for free to get updates from this writer.
Step 1: Go to File and click on ‘New Schematic’.
Step 2: Now to make the schematic, first we will place the components. Click on the component icon and a Select Component Symbol box appears. Write NE555 in search option and select it and click OK.
Step 3: Place other components such as capacitors, resistors, grounds by clicking on their icons.
Step 4: Connect them by using wire. Connect pin 1 with pin 5 through 0.01 uF capacitor(To add a value of the capacitor, left-click on component a box appears, write 0.01u as capacitance in capacitor properties). Apply the trigger to pin 2 by adding voltage supply( to add this write voltage in Select Component Symbol and click OK) and set the pulse to the trigger input (to set pulse right click on the component, Voltage Source Box appears. Click on Advanced option and Independent voltage source box appears. Set Von as 8V, Ton as 100us, Tperiod as 5 ms). Short Pin 6 and 7. Connect Pin 8 to Pin 7 and Pin 6 to pin 4 through a resistor of 45 Ohm (To add a value of the resistor, left-click on component a box appears, write 45 as resistance in resistor properties). Apply voltage source to pin 8 and set the value as 5V. Connect Pin 1 to Pin 6 through the 0.1uF capacitor. Attach the wire to Pin 3 for output.
Step 5: The schematic is completed and it will look like the figure shown below:
Step 6: Now to simulate the schematic, click on the Run icon. Edit Simulation Command box appears. Write 20 ms as the stop time and then click OK. Now click on the wire attached to Pin 3.
Step 7: Output tab appears as shown below.
In next post, we will teach you how to make PCB for this.
So we hope you liked this tutorial. We would love to hear from you guys what you think about it. For any doubts or queries or any other projects if you would like us to post, please comment below. Don’t forget to applaud the post. Keep geeking it out 🤓
Follow, Subscribe and Share our blog for learning new skills and let your friends also know about this tutorial to learn these skills that will be useful in future. And also please give your valuable feedback in the comments section below.
