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Category: Stompbox stuff

Noise Reduction with Companders

Posted on January 4, 2016January 18, 2016

What’s a “compander”? It’s a simple way to make your circuit quieter! So how does it work? Let’s say we’ve got a fairly noisy effect, like a BBD. The basic idea is that you make quiet signals louder before you put them through the effect, and then you make them quiet again after the effect, […]

Posted in BBDs+Delays, Chorus, Flanger, Projects, Stompbox stuff   15 Comments on Noise Reduction with Companders

Investigations into what a BBD Chorus unit *really* does

Posted on June 13, 2015October 31, 2018

I’ve been curious about Chorus for a while, since I’ve been working on and off with chorus design myself. There were a few things I didn’t understand, like what the relationshp is between the modulation LFO’s waveshape and the frequency modulation of signals going through the chorus. You’d think that if you use a sinewave […]

Posted in BBDs+Delays, Chorus, Flanger, Stompbox stuff, Synth DIY   17 Comments on Investigations into what a BBD Chorus unit *really* does

Useful design equations for the PT2399

Posted on June 13, 2015January 4, 2016

The PT2399 datasheet gives some data showing the relationship between the resistor on pin 6, the clock frequency, and the delay time. Unfortunately, it doesn’t offer any design equations relating these three variables. So, can we derive some? Yes, we can! They’re all included here. First, a quick summary of what I’ve learned, if you […]

Posted in Stompbox stuff   4 Comments on Useful design equations for the PT2399

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