Blog

Reflow Micro Table: Compact USB PD Reflow Table with Browser Control

pvit — Sat, 11 Apr 2026 08:33:39 GMT

www.youtube.com/watch Reflow Micro Table is a compact Bluetooth-controlled reflow table with an 80×70 mm working area. It is built for those who assemble PCBs from time to time and do not want a bulky professional-grade machine taking up desk ...(read more)

Simple DCR (Direct Conversion Receiver) – Part 2: Common Emitter Amplifier

shabaz — Tue, 24 Mar 2026 03:06:52 GMT

Table of Contents Introduction Circuit Diagram Dealing with Inputs and Outputs Power Supply Problem! Applying a Signal Frequency Response Loading the Amplifier Testing Both Stages Together Summary For all blog posts in this series, click here, o...(read more)

A 4-zone universal transmitter node for open-drain sensors (Proof of Concept)

BigG — Thu, 19 Mar 2026 23:37:23 GMT

Introduction Traditional home security systems have long relied on a centralized architecture. All of the signal processing and control logic lives in a single, often bulky, cabinet. The user interface is usually just a simple keypad used for arming ...(read more)

Simple DCR: Assembling a 7 MHz (40m) Direct Conversion Radio Receiver – Part 1

shabaz — Thu, 12 Mar 2026 08:38:11 GMT

Table of Contents Introduction How Does It Work? How to Build It? Circuit Diagram What Has Been Constructed So Far? Audio Amplifier Testing the Amplifier’s Third Stage Summary For all blog posts in this series, click here, or type simple_d...(read more)

EoRa-S3-900TB with FreeRTOS — LoRa Camera Control System --Avg 174 µA

AB9NQ-William — Sat, 28 Feb 2026 11:48:14 GMT

A long-range wireless camera battery control system built on the EoRa-S3-900TB development board (ESP32-S3 + SX1262 LoRa). A FreeRTOS-based Transmitter (TX) sends commands over LoRa to a deep-sleep Receiver (RX) that controls camera power v...(read more)

Easy Xmas Gift: Simple LED Name Signs or Night-Lights

shabaz — Mon, 08 Dec 2025 12:53:40 GMT

I had a small request from a friend to produce a night-light that spelled out his kids' names. This turned out to be a very easy project. I obtained quarter-circle wood dowel with a 45-degree cut on the inside, instead of a sharp 90 degree corne...(read more)

MiniThermaDrive: Fun with 3D Printer Heating Elements - Part 1

shabaz — Wed, 05 Nov 2025 16:03:12 GMT

Table of Contents Introduction What can it be used for? High-Level Design Driver Board Summary Introduction Ever wanted to heat something to a precise temperature? I have, but I initially didn’t know how to go about it. 3D printer spares a...(read more)

LoRa Standalone Sensor Network ~45 µA Node with radio.sleep and deep sleep

AB9NQ-William — Thu, 09 Oct 2025 21:17:57 GMT

"LoRa BME280 Sensor Network" a collaboration between Anthropic's Claude and William Lucid. Project requires two, "Ebyte" EoRa-S3-900TB Development Boards; one for Gateway and one for Node. One 74HC04 for each node to reroute the Lora DIO1 signal to ...(read more)

CH340: Building Yet Another USB-C to UART Adapter Board

shabaz — Wed, 27 Aug 2025 21:25:40 GMT

Table of Contents Introduction Features Circuit Diagram Building It Using It Summary Introduction USB-to-UART adapters are extremely useful when connecting devices, as UART is a widely standard protocol available on many microcontrollers and per...(read more)

Building a VK5JST Antenna Analyzer for HF, VHF and UHF

shabaz — Sun, 08 Jun 2025 20:00:19 GMT

Table of Contents Introduction Obtain a Kit of Parts Building an Enclosure Flex PCB Construction Panel Meter End Panel RF Connector Assembly Main Board Parts Soldering Joining the End Panel and Main Board Attaching the End Panel/Main Board Assembly...(read more)

A Three-Way Prototyping Board for Awkward Through-Hole Components

shabaz — Fri, 14 Mar 2025 17:07:01 GMT

Table of Contents Introduction What Problems Does it Solve? Working with Dual-in-Line (DIL)Headers Working With Pi Pico and other Wide DIP Devices Easy Desoldering Easy Grounding Large Screw Terminals and Connectors Support Summary Introd...(read more)

Half-Hour Project: Building a Simple Audio Amplifier

shabaz — Wed, 05 Mar 2025 01:29:19 GMT

Table of Contents Introduction How Does it Work? Building It Using It Summary Introduction A while back I built a little audio amplifier based on a circuit found in an old book. The amplifier performed reasonably OK (by that I mean adequat...(read more)

KiCad 8: Working with Circuit Simulations!

shabaz — Thu, 05 Sep 2024 01:24:36 GMT

Table of Contents Introduction Create the Schematic Adding SPICE models Adding Simulation Voltages Running a Simulation Plotting Frequency Response Simulating Parts of a Circuit (Excluding some Components) Summary Introduction The recent release...(read more)

Bridgetek EVE Series - Touch Enabled Graphical User Interfaces

BRT-Marketing — Fri, 26 Jan 2024 06:40:42 GMT

Bridgetek’s products include the EVE family of display controllers which make it easy to add attractive and fully featured touch-enabled graphical user interfaces to existing and new product designs. To improve the user experience and functiona...(read more)

High Voltage Isolated Measurement Board: Initial Prototype

shabaz — Wed, 13 Dec 2023 21:10:00 GMT

Introduction In an earlier blog post Very Low-Cost Pulse-Width Modulation (PWM), and Isolated Analog Measurements a method was discussed to perform isolated analog measurements at a sub-£1/$1 price. It was fine for slow-ch...(read more)