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RFBitBanger. A QRP digital transceiver created from readily available parts for off-the-grid maintenance

Apple2Card. Apple II Peripheral Card that Interfaces to a ATMEGA328P for SD card storage

VNA. Vector Network Analyzer based on the STM32F103C8T6 bluepill

ModularTuner. A Modular Antenna Tuner for a Phased Array Antenna System

DRSSTC-PCB-Pack. A pack of PCBs for a dual resonant solid state tesla coil setup. Pretty much everything you need.

GuitarPico. A guitar effects processor based on the Raspberry Pi Pico

HIDPanel. A customizable HID USB device with buttons, encoders, sliders, potentiometers, etc.

ISACard. A ISA card for PC/XT/AT that has SD storage and SPI/I2C interfaces using a ATMEGA328P

STM32surface. STM32F103C8T6 bluepill like board with 0805 size and easily sourceable parts

QRPAmplifier. Layout of WA2EBY amplifier in Kicad, licensed CC-BY-SA 4.0

PowerAmpAudio. Power Amplifier based on Michael Chua's C300 amplifier

Z80SBC. Assembly

TMatchPCB. An adjustable T Match where the capacitors and inductors are on the PCB.

ParanoiaBox. A standalone elliptic curve/AES file encryption and decryption device

Apple2Shield. An Apple ][ bus card that allows an Arduino and/or a Shield to be connected to the Apple ][ bus.

LinearPS. Linear constant constant/current constant voltage power supply PCB

FlexibleCharger. An Arduino-controlled charger for different kinds of batteries, or it can be a standalone power supply

MCTheremin. Microcontroller based theremin using the STM32F103C8T6 bluepill board

PicoAlt2. An alternative Pi Pico 2 (RP2350) type board you can have made yourself.

ActiveRFProbe. An active RF probe based on the 2SC3356 transistor available from many sources.

LittleDX. A super simple, super cheap all-mode QRP transceiver

WifiModem. An implementation of an interface between an ESP8266 to a line level serial port

TrebleSynth. A Raspberry Pi Pico miniature synth keyboard inspired by analog keyboard with analog controls and MIDI

OneChipTerminal. A single chip VT100 terminal based on the STM32F103C8T6/CS32F103C8T6

NixieClock. A Nixie clock that uses IN-14 tubes and very generic components that can be easily sourced.

RFNoiseSource. A RF noise source with about 2 GHz bandwidth

SuperProbe. A single PCB implementation of Carlson's superprobe in Kicad

PrettyGoodPreamplifier. A Pretty Good Preamplifier for Stereo and Subwoofer Use

STM32alt. STM32F103C8T6/STM32F103CBT6 Bluepill-compatible devboard with through-hole parts (mostly)

FreeCADParametricModels. A bunch of useful FreeCAD parametric models I've designed

HighVoltageOpAmp. A discrete high voltage op amp that uses 5551/5401

PhonoPreAmp. A Phono Preamp Based on Bill Christie's design

SchottkyNoiseSource. A Schottky RF noise source based on the BAT17 diode

fldigi. fldigi repository with SCAMP

PhonoJFET. An amplifier for a contact piezo microphone, for a mechanical phonograph player or an acoustic guitar, etc.

STM32F4ThruPill. STM32F405RGT6 dev board with bluepill compatible pinout and through-hole components

ip65. IP65 - a TCP/IP stack for 6502 based computers (added Dan ][ card support)

RFUtilityKnife. Five circuits for RF work crammed onto a single PCB.

ActiveDifferentialProbe. A RF Differential Probe based on the 2SC3356 transistor

CGA2Scart. A PCB for a CGA To SCART adapter

STM32F4surface. A STM32F4/STM32F1 LQFP64 surface mount PCB

RFUtilityKnifeBFP740. The RF Utility Knife PCB, redone for the BFP740 44 GHz transistor

SuperGainClone. A stereo layout of Bob Cordell's Super Gain Clone amplifier.

PicoAlt. An alternative Pi Pico type board you can have made yourself.

ssc. Simple Serial Card, an Apple Super Serial Card clone

PLLBoard. A SI5351A based PLL with the option to add a TCXO

NanoDIP. A PCB with the Arduino Nano pinout but uses the ATMEGA328P

NiftyRobot. A Raspberry Pi/Arduino based robot with ultrasonic, infrared, other sensors

STM32F411surface.

PersistenceDisplay. A 3-D persistence display

LEDPanel. A panel for illuminating a decorating display from below with options for size and layout

SuperSpeakerSwitcher. A heavy duty switch between two audio amplifiers and two sets of speakers.

TriacControl. Triac Phase Controlled by analog / PWM signal

MeterMaker. A device for controlling analog galvanometers and other meters for making silly displays

Jumentum-SOC. A tiny basic interpreter with a web interface that can be used to automate projects.

ArduinoSTM32_TVout. Arduino STM32 TVoutライブラリ

BizBopWhingWhang. A device for twiddling the mouse optically

Arduino_STM32. Arduino STM32. Hardware files to support STM32 boards, on Arduino IDE 1.8.x including LeafLabs Maple and other generic STM32F103 boards