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W4KRL

Electrical engineer, licensed amateur radio operator, railroad enthusiast.

Northern Virginia

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This user joined on 03/29/2014.

My Projects

Modify the output voltage of a dollar store automobile cell phone adapter.

Dollar Store Switch Mode Buck Power Supply

Build a meter in a jewel box using a micro-servo driven by a DigiSpark.

Jewel Box Servo Meter

Projects I Like & Follow

KaRadio A fully featured wifi web radio player with only low cost boards. with or without a vs1053 board

WiFi Webradio on ESP8266 or ESP32

jean-pierre-cocatrix Jean-Pierre Cocatrix

The 2015 Hackaday Prize

A full stack project dedicated to easily collecting, analyzing and sharing IoT sensor data.

analog.io - A full stack IoT platform

luke-beno Luke Beno

Bypass the Arduino library to get 688,000 samples/sec (52 times faster than the library). Fast enough for audio signals.

Arduino Oscilloscope: 688000 samples/sec

bruce-land Bruce Land

Investigating fluxgate current sensors (DC capable) with detours into analog electronics and switched mode power supplies.

DC Current Transformer

Wireless packet radio interface for HF/VHF/UHF transceivers, using ESP32 as KISS TNC or audio relay for use with soft modems

ESP32 TNC and Audio Relay for HF/VHF Packet Radio

ryan-kinnett Ryan Kinnett

A minimal-parts AX.25 / APRS TNC that can pair with a phone.

ESP32 AX.25/APRS TNC

This microcomputer system combines a vintage Z80 microprocessor with a modern ATMEGA328P microcontroller.

Z80 microcomputer

nigelhunter nigel.hunter

A digital model train controller for those who still want an analog world.

Model Train Controller

john-spencer John Spencer

An interesting project that describes how to make several useful devices using a CFL bulb ballast, with minimal modification.

Induction Heater and HV source from CFL Bulb

mircemk mircemk

Thoughts and tips about the TTGO T-Watch

TTGO T-Watch review

chris-low Chris Low

Break-out & interface board for the Dorji DRA818 amateur radio transceiver modules

NoVAHammy

bob-coggeshall Bob Coggeshall

FreqMeasure & FreqCount Arduino Libraries

paul-stoffregen Paul Stoffregen

A simple way to make a transformer for a vacuum tube project

Quick and Nasty Tube Power Supply

This PCB is a single channel gateway of LoRa, You can use this PCB as a node as well.

LoRa gateway single channel PCB

akarshagarwal98

Current cost: under $50

Project Photobooth

samuel-wittman Samuel Wittman

Bits