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This is my first blog....Here you will be getting much of knowledge from internet .i.e. from best sites of electronics that probably people dont know till.

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IC555: Astable Multivibrator- LED blinking/Dancing

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The  555 Timer IC  can be connected either in its Monostable mode thereby producing a precision timer of a fixed time duration, or in its Bistable mode to produce a flip-flop type switching action. But we can also connect the 555 timer IC in an Astable mode to produce a very stable  555 Oscillator  circuit for generating highly accurate free running waveforms whose output frequency can be adjusted by means of an externally connected RC tank circuit consisting of just two resistors and a capacitor. Below video shows implemented circuit in Proteus design suite. You can see the LEDs connected to output pin are blinking continuously.  In the  555 Oscillator  above video, pin 2 and pin 6 are connected together allowing the circuit to re-trigger itself on each and every cycle allowing it to operate as a free running oscillator. During each cycle capacitor,  C  charges up through both timing resistors,  R1  and  R2  but discharge...
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Simple 2.4GHz dipole antenna program in MATLAB

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Below is simple MATLAB code for 2.4GHz dipole antenna. Normally the length of this dipole is λ/2 λ=c/f c is speed of light i.e. 300000000 m/s And f here is 2.4GHz  And we found λ/2 to be 0.0625 We used length here to be 0.0600 since for this length we get good VSWR or we can say reflection is low. Code: d = dipole( 'Width' ,0.000525, 'Length' ,0.060) %This shows the length and width of the dipole %You can calculate the length as per lambda/2 and then optimize according to VSWR/Reflection coefficient you get show(d) freq = linspace(2e9,2.7e9,51); %This is frequency sweep figure; pattern(d,2.4e9) figure; vswr(d,freq,50)   Below are the output figures Radiation Pattern of the antenna is almost Omni-directional and it's like a donut shape. In the figure below, you can see VSWR is below 2 and this is good value 
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Continuous Wave Radar

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  Assume  The E-field transmitted can be written as below The returned E-field at some time later is Time it took to travel to and from the object(target) is Substituting The received frequency can be calculated by taking time derivative of the quantity in red above and dividing by 2pi   Here,           The blue coloured quantity above is nothing but he Doppler shift frequency. Here the sign essentially indicates the target moving direction If the doppler shift is negative then the target is moving away from the radar and vice versa And thus the velocity can be written as
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