MEP EP#239: Frictionless Spherical Cow Transformers

<h4><a href="https://macrofab.com/blog/mep-ep239-frictionless-spherical-cow-transformers">MEP EP#239: Frictionless Spherical Cow Transformers</a><br></h4><h4>Parker</h4> <ul> <li>Garage Door opener hacking <ul> <li>Converting my normal style garage door opener to a “jackshaft” style opener</li> <li>Reversing the direction of the A/C single phase motor? <ul> <li>Split phase motors</li> <li>One phase is shifted with a large capacitor by ~90 degrees</li> <li>In my application I just had to reverse the wires and the end stop wires</li> </ul> </li> </ul> </li> <li>PyInstaller <ul> <li>Can take your python scripts and make it into a self contained application</li> <li>Useful for non technical inclined people on your team</li> <li>Cross Platform!</li> <li>GUIs <ul> <li>Tkinter seems to work well in Win10 and Ubuntu 20 LTS</li> </ul> </li> </ul> </li> </ul> <h4>Stephen</h4> <ul> <li>High voltage low current measurement <ul> <li>Tony_W Recommended the ACS37002 <ul> <li>Hall effect sensor that can be ground referenced in very high voltage applications </li> <li>0.85m ohm conductor resistance</li> <li>4.8kV RMS isolation voltage</li> <li>VCC of up to 6.5V</li> <li>-50 to 50A sensing range</li> <li>Gain selection of 30mv/A to 60mV/A</li> </ul> </li> <li>In my situation I would want to monitor 0.1mA or 100uA. With a gain of 60mV/A that would be 60uV/mA so 0.1mA would be 6uV….. This may still not be the best solution because I would likely need a ton of gain and have to correct for any offsets.</li> <li>Possibly to a tro prong approach - Measure voltage across known resistances in the circuit</li> </ul> </li> <li>Getting transformers manufactured for your product <ul> <li>What do you need to know?</li> <li>How do you get started?</li> <li>What are the specifications <ul> <li>Mains transformers</li> <li>SMPS and flyback style “yellow tape” Transformers.</li> </ul> </li> </ul> </li> </ul>