Eric Sorensen - esorensen.com

Eric Sorensen

Denmark: Amplifier Module

Denmark: Amplifier Module

This post summarizes the build of an ICEpower-based 3-channel amplifier with DSP crossovers.

CNC Mill Update - 2023

CNC Mill Update - 2023

In this update post I will describe a few of the modifications and improvements I’ve done to the mill. I occasionally get emails requesting information about modifying the mill and I hope this post will be helpful for anyone else working on a benchtop mill.

Coffee Roaster Controller Intro

3dprinted Featured

Coffee Roaster Controller Intro

In this post I will document the build of my air popper controller to roast quality coffee. I am providing enough detail that someone interested should be able to replicate the project. If you are working on building your own and run into any issues please reach out!

Coffee Roaster Conclusion and Results

Coffee Roaster Conclusion and Results

On this page I wrap up the project by covering a few open items. I summarize the experience using the roaster and lay out some future opportunities.

User Interface and Firmware

User Interface and Firmware

This page gives a high level overview of the user interface design of the coffee roaster. I discuss the management of responsibilities between the Nextion display and the Arduino controller and summarize the UI elements.

Building the Control Board

Building the Control Board

This pages summarizes the bill-of-materials and schematic for the coffee roasting controller. Wiring up the controller is pretty straightforward and follows directly from the schematic.

Modifying the Air Popper

Modifying the Air Popper

This page shows the process of modifying a Poppery II popcorn popper so that the motor and heater coils can be operated independently of each other. During the modification a thermistor is added to monitor the temperature of the coils and a thermocouple to monitor the chamber temperature.

Bookshelf Speakers + Mini Subwoofer

Bookshelf Speakers + Mini Subwoofer

This is a build log for a custom set of speakers I built for a friend. I made a subwoofer similar to the "Voxel" design from Paul Carmody. I made it slightly larger, increased the port diameter, tuned slightly lower, and added a Lepai plate amplifier. I am *very* impressed

D&D Miniature and Dice Holder

D&D Miniature and Dice Holder

As a Christmas present I hired someone on Fiverr to create a 3D model based on the image and I 3D-printed a couple of custom miniatures. I also created a wooden dice tray and miniature holder for storage out of walnut.