Category Archives: Math

Engineering, computer programming, general design and geekery

Coil winder Part 2: considering servos for traverse

In order to minimize parts count, cost, and complexity while maximizing flexibility, I have settled on a servo for the winder’s traverse mechanism, rather than the traditional stepper or DC motor. It will I weighed the pros and cons, and

Coil winder Part 2: considering servos for traverse

In order to minimize parts count, cost, and complexity while maximizing flexibility, I have settled on a servo for the winder’s traverse mechanism, rather than the traditional stepper or DC motor. It will I weighed the pros and cons, and

Working toward a 3d-printed CNC coil winder

My recent excursions into the world of Arduino and 3D printing has opened up a whole world of possibilities.  Since I am in the process of retooling my workshop and designing a new winder, I thought it would be a

Working toward a 3d-printed CNC coil winder

My recent excursions into the world of Arduino and 3D printing has opened up a whole world of possibilities.  Since I am in the process of retooling my workshop and designing a new winder, I thought it would be a

Guitar Pickup Theory #6c: Coil shape Part 3 – coil-sense area

Welcome to part 3. Let us again recap the theories we are testing: theory 1) (mostly true) – the shape gives more inductance and DCR per turn, which makes for a lower resonant frequency with a lower Q value theory

Guitar Pickup Theory #6c: Coil shape Part 3 – coil-sense area

Welcome to part 3. Let us again recap the theories we are testing: theory 1) (mostly true) – the shape gives more inductance and DCR per turn, which makes for a lower resonant frequency with a lower Q value theory

Guitar Pickup Theory #6b: Coil shape Part 2 – winding-capacitance

Welcome to part 2. Let us recap the theories we are testing: theory 1) (mostly true) – the shape gives more inductance and DCR per turn, which makes for a lower resonant frequency with a lower Q value theory 2)

Guitar Pickup Theory #6b: Coil shape Part 2 – winding-capacitance

Welcome to part 2. Let us recap the theories we are testing: theory 1) (mostly true) – the shape gives more inductance and DCR per turn, which makes for a lower resonant frequency with a lower Q value theory 2)

Guitar Pickup Theory #6a: Coil shape Part 1 – DCR and inductance

This entry will examine the effect of the shape of a pickup coil on the tone of the pickup, as well as the underlying causes, and provide empirical evidence as support. More specifically, I want to address tall+narrow coils vs

Guitar Pickup Theory #6a: Coil shape Part 1 – DCR and inductance

This entry will examine the effect of the shape of a pickup coil on the tone of the pickup, as well as the underlying causes, and provide empirical evidence as support. More specifically, I want to address tall+narrow coils vs

Trash to treasure: converting a wall wart to an audio transformer

I need a 4:1-6:1 tranny that has a flat-ish response from about 100Hz-10kHz to interface a thingie to my computer’s soundcard. A Neutrik NTE4 goes for about $12 and would work fine, but there is shipping and waiting for it to

Trash to treasure: converting a wall wart to an audio transformer

I need a 4:1-6:1 tranny that has a flat-ish response from about 100Hz-10kHz to interface a thingie to my computer’s soundcard. A Neutrik NTE4 goes for about $12 and would work fine, but there is shipping and waiting for it to

Guitar pickup theory #5 : shielding, hum-cancelling and flux concentrators

Since I am STILL waiting for my parts orders to arrive, I took the time to run a few tests on shielding materials’ noise reduction in practical situation (i.e., sitting in front of my computer workstation).  This is just another

Guitar pickup theory #5 : shielding, hum-cancelling and flux concentrators

Since I am STILL waiting for my parts orders to arrive, I took the time to run a few tests on shielding materials’ noise reduction in practical situation (i.e., sitting in front of my computer workstation).  This is just another