Welcome to Part Three of this multi-part series on Passive Filters! In Part 1 we went over preliminary information to go about analyzing and designing passive filter circuits. That information isn’t required for basic filter design but it is required for designing and analyzing more complex filters, so it would be a good idea to run… Continue reading Passive Filters – Part 3 – Modified Passive RC Filters
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Passive Filters – Part 2 – Low Pass & High Pass RC Filters
Welcome to Part Deux! In this article we’ll be covering the simple Low-Pass and High-Pass RC filters. While it’s encouraged to read Part 1, it’s not entirely necessary if you’re here for practical purposes. If the rabbit hole of filter design is calling you ever-so-strongly then you might want to consider reviewing Part 1. For… Continue reading Passive Filters – Part 2 – Low Pass & High Pass RC Filters
Passive Filters – Part 1 – Preliminary Stuff
Filters are used literally everywhere in electronics… They’re used for decoding communication lines, tuning your radios, and (most importantly) making sure your tone is absolutely killer! You can build basic filters very cheaply, with just a couple of components. In this multi-part series we’ll be looking at filters made up of capacitors and resistors, and… Continue reading Passive Filters – Part 1 – Preliminary Stuff
Dissecting the Tremulus Lune LFO Circuit
So I’ve been working on a BOSS CH-1 mod and in doing so I’ve been increasingly interested in how Low Frequency Oscillator (LFO) circuits are designed and constructed. Its worth investing time on the topic, especially since when diving into modulation effects you quickly find out that LFOs exist at every corner. Most LFOs are very… Continue reading Dissecting the Tremulus Lune LFO Circuit
All-Pass Filters in Phase Shifters
Let’s talk about destructive interference. Consider two periodic signals of the same peak amplitude and frequency, say 1V peak and 440Hz, respectively. If these two signals are in phase with each other (i.e. if they are 0 degrees apart from each other) and they are added together they will constructively interfere with each other. This means… Continue reading All-Pass Filters in Phase Shifters
Switching Circuits in BOSS & Ibanez Pedals
The last Inside Look post on Rocktron’s Rampage Distortion switching circuit sparked my interest in how other designers carry out their signal switching. After scrounging around the net I found a neat geofex article titled “The Technology of JFET Switching in BOSS and Ibanez Pedals” by R. G. Keen published in 2010. In fact, if you dig… Continue reading Switching Circuits in BOSS & Ibanez Pedals
Rocktron’s Rampage Distortion Switching Circuit
Part 1: Important Components 1) ON Semiconductor MC14584BCP Hex Schmitt Trigger An ideal inverter is one which, when taking in as input a logic HIGH (VDD), yields a logic LOW (0V) at the output and vice-versa. Now there are inverters…and then there are Schmitt Triggers. This isn’t the name of your typical high school punk… Continue reading Rocktron’s Rampage Distortion Switching Circuit