Butterworth, Sallen-Key & Chebyshev Filter Analysis, Design and Synthesis

I separate the implementation in several parts as outlined below.

Part A.
A1. Design a normalized low-pass filter with Butterworth response, cutoff rate equal to 18dB/octave and maximum allowed gain deviation in the pass region equal to amax = 1.5 dB.
A2. Implement the normalized filter by connecting in cascade multiple sections. All capacitors must be identical. For the implementation of the second section, use a Sallen-Key filter with identical resistors and identical capacitors (Design II).
A3. Depict the logarithmic gain curve as calculated from the transfer function of the design along with the transfer function of the circuit.
A4. Denormalize the circuit such that the cutoff frequency become fc = 1.6 kHz and the resisters be at their normal values with dimensions. Sketch the logarithmic gain curve of the denormalized circuit given frequency f (logarithmic axis)....

Fix Windows Boot issues - Your PC needs to be repaired | The drive where Windows is installed is locked

I have wrestled a few times with this unsurprisingly common BSOD, both with my own computer and on friends'. A quick online search led me to believe that many are suffering from it, so I thought about making this post to help somebody out. I know it can be alarming to see such an error for the first time, as it's a BSOD error basically totally preventing you from using your computer. But go through this article and with a little patience, we can, and we will, fix it together. (Honest!)

In the beginning...

... there was nothing ... there was darkness.

13,800,000,000 years later, in 490 BC, Greek forces lead by Miltiades, outnumbered, managed to overpower the opposing Persian military, but had to quickly march for Athens to defend their fair city from the oncoming threat. Miltiades sent a runner on ahead to Athens with news of victory, Pheidipidis. Upon reaching Athens, having exerted all his strength Pheidipidis said "Νενικήκαμεν!" ("Rejoice! We have victory!") and dropped dead of exhaustion. Theirs was a struggle of a desperate forced march. Theirs was was a story of courage.

Some 2,500 years later a young man had a dream which he sort of accomplished up against the odds. He made this website to share his memoirs. This too, is a story of courage. Subscribe to the newsletter to see it unfold and enjoy your stay.