Voltage Regulators: An Introduction

We finish off our Introduction to Electronic Components series with the voltage regulator, which is a useful little thing. Sometimes, you have more voltage than you need—say, when you’re working with a 9 volt battery but you need 5 volts for your circuit. Also, if your project is especially finicky, they can also take in a fluctuating amount of voltage and emit a perfectly constant value.

If you’re looking for more about other components (say…diodes, buttons and switches, resistors, etc etc) check out the whole playlist!


A Speaker From a Starbucks Cup?

Part of what we at the Science of Music love about DIY electronics is the tinkering aspect of it. It’s the idea that you can take an everyday object and just…flip the script a little bit to create something new entirely. That’s the spirit with which we present this video project.

We looked at a Starbucks cup and, with just some magnets, a coil of wire, some tape we saw how you could “flip the script” to create a working speaker. Plus, it’s a good excuse to get yourself a frappuccino*.

(*Note: not an action we recommend in January. Unless you’re close to or within the Southern Hemisphere. In which case: Hi, can we come visit?)

Introduction to Resistors


In a continuation of our Introduction to Electronic Components series we present (drum roll please) resistors!

Resistors…resist. It’s what they do. Well, they don’t resist everything. They won’t help you resist the temptations of the dark side, for example. But these little guys are useful components when it comes to regulating the amount of electricity with which you want to work.

Interested in more? Check out our full playlist here.

Introducing an Introduction (to Electrical Components: Capacitors)

New YouTube channel means new content! The Science of Music presents an Introduction to Electrical Components: an ongoing series dedicated to teaching the basic building blocks of musical electronics. Today’s topic: capacitors or “caps” for short.

Capacitors are a type of passive electrical component that store electrical charges via an electrostatic field. There are several different types of capacitors, and we’ll go through their differences and shared similarities.

Be on the lookout for more in our Intro to Components series with resistors, voltage regulators, and more in the weeks ahead.

DIY: Build Your Own Microphone!

This how-to video explains the process of building a dynamic microphone (which, incidentally, can also be used as a loud speaker) from a cup! This rudimentary audio transducer could be used as a quick project for a physics class exploring electromagnetism or an audio technology class exploring transduction. Or you could do it just for kicks.

The fidelity of the completed project is not studio quality (if it was our lives would be a whole lot cheaper), but it’s cool. And on the upside you don’t have to have an EE degree to build it.


  • Written and Directed by Travis Kaufman and Nick Dooley
  • Produced with support from The National Science Foundation

Can Speakers be Used as Microphones?

A door once opened can be stepped through in either direction…

Okay, we promise that we’re serious people when we’re not making Doctor Who references (but we are never not making Doctor Who references so…paradox?). This video shows how a speaker, once removed from its enclosure, can be used as either a speaker or a microphone, thus exhibiting the beauty of transduction! Specifically, this is a good example of how electromagnetic transduction can work in both directions (electrical to acoustic transduction and acoustic to electrical).


  • Directed by: Langdon Crawford
  • Voice:  Tyler Mayo
  • Editing Caitlin Gambill

Introduction to Transduction

Simply put, transduction is the process of converting one type of energy to another. For audio-specific purposes, if you’ve ever used a microphone or a speaker to record or amplify a sound, you’ve seen transduction in action.

A microphone works as a transducer by changing acoustic waves to electrical waves.  And a loudspeaker is also a transducer, even though it does the opposite: by changing electrical waves to acoustic waves.

Check out the video below for more: