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Showing posts from December, 2019

How are capacitors used to filter noise? [A unique explanation]

If you have worked with guitar pedals and audio circuits in general, you may already know how capacitors are used as low/high pass filters. While designing non-distortion guitar pedals (tremolo, reverb, delay, etc.), a designer uses capacitors in some way or the other to make sure that all the amplification and equalization does not bring in any sort of distortion.

The question is how do you filter out distortion?

This article is about one of the most exciting concepts that exploit the beauty of science and math to provide an altogether new way of thinking about circuits.

Before I actually come to the 'aha-moment', I'd like to make sure everyone reading this article is on the same page. 
If you are already good with low pass filters you can skip reading till you see a bold blue text that says 'skip till here'.
What you see below is called a low pass filter circuit (or to be more precise a passive low pass filter circuit).

Such a filter circuit allows low-frequency signal…

Distortion Pedal Electronics (Explained for beginners!)

If you are into DIY guitar pedals and want to start designing your own effects, this article might help you open a few doors. I write this article as an EE student who earlier struggled with understanding these circuits and would often simply copy schematics off the internet. 

This article is intended for-
1. Absolute beginners who like tinkering with electronics
2. Anyone who has been learning analog circuits and is looking for a jumpstart project.

Also before I start I'd like to mention, for anyone who wants to get a rock-solid foundation in Analog electronics, I highly recommend reading the book, 'Electronic Principles' by AP Malvino and David Bates.

Distortion Pedals come in all flavors and sizes, however, how the distortion effect is achieved in any of the pedals is more or less similar. Let's first see how the output of the pedal compares to its input.

The raw signal coming from the guitar is first amplified a little, and then the peaks of the amplified signal are clip…