QTPy-knob: Simple USB knob w/ CircuitPython

A how-to on making a simple USB media knob using rotary encoder and Neopixel ring: I like minimal solutions to problems. I was playing with a CircuitPython-enabled QT Py on a breadboard with and a rotary encoder and I ended up making a USB knob, like many others have done before. But I realized: waitaminute, […]

A passive tunable HF preselector

Dave Richards (AA7EE) has written an article detailing his tunable passive HF preselector: When I built the VE7BPO DC Receiver Mainframe recently, it wasn’t intended to end up as a final finished project. The intention was more to have it as part of an experimental platform. The little box that contains the DBM, diplexer, and […]

MetaClockClock build

Erich shared detailed instructions of how to build the MetaClockClock project, a set of individual analog ‘clocks’: The ‘MetaClockClock’ project is using multiple small dual-shaft stepper motors which are usually used in instrumentation clusters. In this project multiple such motors are interconnected on a RS-485 bus and can be controlled by a master to display […]

Over engineered true random value generator

maker_ATOM shared detailed instructions of how to build over engineered true random value generator, project instructables here: Random numbers are often used in daily for example in encryption, gambling, gaming and much more. These numbers are generated by computers using complex algorithm but it can be predicated if we know the seed value and the […]

DIY current sensor capable of handling up to 15A

Utsav shared detailed instructions of how to build your own current sensor that can measure up to 15 Amps, project instructables here: This current sensor can easily be used for measuring currents up to 15 Amps constant and can even handle about 20 Amps peak. I had previously built a shunt current measurement module using […]

Laser cut project plate

Layne designed a laser-cut project plate: When I build electronics prototypes, it’s sometimes difficult to keep all the parts together without falling apart, especially if you need to move everything from one location to another. Between the breadboards, Arduino boards, programmers, FTDI cables, spare wires, and spare parts, I wanted to create a way to […]

A sensitive, frequency-modulated dip meter capable of measuring resonator Q

Qrp Gaijin’s version of a dip meter to measure resonator Q: A highly-sensitive, narrow-band frequency-modulated dip meter offers a simple way to measure resonator Q. I have been working with an unusual dip meter circuit recently that has some interesting properties. The dip meter, also called a grid dip meter, is a simple homebrew instrument […]

Low-cost open source ventilator-ish device

Johnny made a low-cost ventilator-ish device, that is available on GitHub: In the event that COVID-19 hospitalizations exhaust the availability of FDA approved ventilators. This project documents the process of converting a low-cost CPAP (Continuous Positive Airway Pressure) blower into a rudimentary non-invasive pressure support ventilator that could help with breathing during respiratory distress. It’s […]

Back to basic – Mini CNC plotter

tuenhidiy shared detailed instructions of how to easily build your own low-cost Arduino mini CNC plotter from old DVD/CD player, project instructables here. I have become too concerned with complicated details or new things, and now I should concentrate on basic, simple and important ideas. Getting back to basics, to start learning CNC, today I’d […]

DIY portable video conference, sharing and teaching device

A DIY conference and teaching device @ mcuoneclipse.com: COVID-19 is by far not over, and in Switzerland the infection rate is going up again (2nd wave?). During the spring 2020 semester university lock-down we moved pretty much everything to a ‘distance learning’ setup. With that experience and with the request to prepare for the fall […]

The Hayes Chronograph, a remake for 2020

smbakeryt built his own Hayes Chronograph: I’ve always wanted a Hayes Chronograph, but have never been able to acquire one, so I finally broke down and just made my own. The Hayes Chronograph was a compliment to Hayes line of smart modems, and implemented a real time clock for computers that didn’t have a built-in […]