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analog_vu_meter

attiny_audio_spectrum_bar_graph

Audio Spectrum "Analyzer"

attinyx14_arduino

An arduino-style breakout PCB for the ATTINY-x14 line of chips (specifically designed with the ATTINY1614). Includes USB-Serial converter and USB connector so it is pretty much plug-and-play once you flash megatinycore onto it.

clap_lamp

A lamp that turns on when you clap twice, with a specific timing. Works pretty well! I put some in 3d printed lithophane cases and gifted them

differential-spi-over-ethernet

Board that natively plugs into PMOD 6x2 headers from Digilent FPGA boards, and converts it to 2 differential SPI channels sent out to RJ45 connectors for ethernet cables

discrete_audio_power_amp

Discrete audio power amp to be drive from +/-15V, up to maybe +/-20V. Sounds pretty nice!

eddy_pcb_coil

eddy_sensor_test_pcb

infrared_remote

Infrared Remote used to control Nikon DSLRs

kasm_pcb

Thesis Project - PCB to drive actuators for the Adaptive Secondary Mirror at Keck

mems-microphone-test-pcb

USB-powered test PCB for a MEMS microphone

milliohm_meter

A milliohm meter PCBA reading 10V/Ohm.

ntc_thermistor_calibrator

Arduino-based board that can plug 8 NTCs into it, with one of them being a fancy calibrated one. Then all 8 can be bolted to a piece of metal, and heated with the onboard heater. The fancy thermistor can be used as a reference, and the other 8 can have their data printed over the USB connection for calibration over the temperature range.

rp2040_pio_dac

RP2040 PCB with a 12-bit R-2R DAC

split_supply_generator

A SMPS board to generate a +/-15V rail from 5V USB or 9-12V Barrel jack. Uses switching regulators followed by linear ones, so noise performance is pretty good at ~10mVpp!

touch_sensor_lamp

A small PCB with a capacitive touch sensor IC and 2 1W LEDs. I use them to embed in 3d-printed lithophane lamps, see

typeytype

wemos_d1_mini_weather_station

Mini weather station built around ESP8266 WiFi SOC on a Wemos D1-Mini breakout PCB. Shows inside temperature and wifi-updated outside temp, and has LED to indicate for rain.

ws2812_array

A 16-tall by 32-wide array of neopixels, with a RP2040 MCU as default processor but also room for a ESP32-C3-MINI-1 for wifi projects.