Denmark: Amplifier Module
This post summarizes the build of an ICEpower-based 3-channel amplifier with DSP crossovers.
esorensen.com
My experiments in video, audio, automation, and programming
Latest posts
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
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
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
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
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
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
This is a build log for a custom set of speakers I built for a friend. Started with some 18mm Baltic Birch plywood. Ripped into 8" strips and glued together I cut four blanks for the front baffles in case I made any mistakes I cut the facets using
Photo of Comet Neowise
Made it over to Mt. Hood to see Comet Neowise and captured this photo. The Portland city lights are visible on the horizon. Comet Neowise. Canon 6dmkii, 24mm prime lens 
Home Antenna Grounding
I recently installed an end-fed wire antenna running from the apex of my garage into a large maple tree in my backyard. I want to get the best performance I can from the antenna and also take the appropriate precautions to operate safely and protect my equipment.
Yeasu FT301D Restore - Part 1
When I first got my ham radio license I purchased a Yaesu FT-301D from another amatuer radio operator on Craiglist. I enjoyed using the radio, but over the years I've ended up using other radios that were either more reliable or matched my requirements better (QRP, portable, etc)
MiSTer Case
I've recently been interested in FPGA-based gaming systems. These systems implement the hardware of gaming systems on a programmable FPGA to achieve very accurate "hardware emulation" of the platform. A recent popular example is the Analogue Pocket , which is an FPGA-based handheld gaming system which can
Loop Antenna Copper Jumpers
I am planning to machine some copper jumpers to go between the copper loop and the vacuum capacitor. These can be soldered (or brazed) to create a solid connection with very low resistance.
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.
LCD Control Board for SX3 Mill
The LittleMachineShop control board replaces the button board built in to the mill, so when the spindle control board is connected the buttons and LCD built in to the mill are no longer functional. I designed a drop-in replacement for the button board to help add back some functionality.