Simple Embedded Solutions

555 Timer Astable mode, Lt spice simulation, and real-time testing  We know 555 timer has three operating modes called Astable mode, Monostable mode, and Bistable mode. Astable Mode : In Astable mode, 555 IC will act as an oscillator that generates a square wave  continuously .  The frequency of the wave can be adjusted by changing the values of two resistors and a capacitor connected to the chip.   LTspice circuit: Formulas: Calculations: Ton = 0.693(1k+100k)22uF =1.539ms Toff =0.693*100k*22uF =1.524ms T = Ton + Toff  = 0.693(1K+2*100k)22ufF=3.064ms  Frequency  = 1/T = 1.44/(1k+2*100k)22uF = 1/3.06ms =0.3263Hz Duty = 50.2% Simulation Results: Click here to download the Astable mode LTspice circuit Testing:

Here is the Simple way to the third party spice models in LTspice. Generally while looking for 3rd party spice model we will get two different types of files  .MODEL and .SUBCKT. Example 1: How to use the 3rd party .SUBCKT file in LTspice  For this, I am taking one PMOS reverse protection as an example. To do this we need the  DMP3098L model which is not available in the LTspice default library.  you will get a spice model in the particular manufacture website, In this case, it's Diodes incorporated. Once you download the spice model ( this will be .txt). Open that file in LTspice you will get details about the model in text. Select the model name and right-click, you will get an option to create a symbol. Once you click that, you will get an automatic symbol creation option. once you press yes your new symbol will be saved in Autogenerated items. Now we will simulate the PMOS reverse protection circuit using DMP3098L. Example 2...