Also left a comment on JHAT Dec 6. Structural batteries and also integration with motors is a fascinating subject. But it suffers from the same problems that the integrated circuits suffered from over the last several decades. Before the integrated circuits could be highly integrated, the optimal structure had to be determined. Things like 8,
(Read More…)
Photo from ?? Thanks, Mike Guerrucci. This is a simple device. That means it’s just a buzzer and a battery. And it has a super sensitive magnetic switch. This detector is always open until it is disturbed by a magnetic field. They call it a magnetometer. One way to make this is to use a
(Read More…)
The beginning isn’t clear about how it looks. First, scroll to end and look at the photo. https://www.randombio.com/capacitor.html
FB comment Years ago at work (community college) we had an IBM mainframe and the terminals were connected with coax cables. We also had thin Ethernet cabling. I had the proper connectors and thousand foot boxes of coax, and most importantly the proper stripping and crimping tools. I installed hundreds of coaxes, and I was
(Read More…)
From FB group Hobby Electronics, 2018-09-01 I faced this dilemma before. I’ve repaired power supplies where the transistor failed because it was not held tightly to the heat sink because of a nylon screw that got hot. I used a steel screw and a fiber washer, and heat shrink tubing over the threads to insulate.
(Read More…)
FB comment “Brilliant!” Preet Sangha said, and I agree, but since I have a hard time seeing small meters across the room, I thought up another, bigger meter. How about this? Instead of meters, use a printout of a meter face, full page size. There will be one for each hour, minute and second. These
(Read More…)
My answer to a FB Arduino group question on Sept 17 Dan Rogers has the right idea. The protoboard, with all the holes in it, was never meant to be permanent. The contacts in each hole lose their springiness as they are used to hold wires. The contacts can become intermittent after awhile. As time
(Read More…)
I’ve been thinking about this for awhile. Let’s say I have a switch, for example a thermal switch that only has contacts that are NC (normally closed) until a certain temperature is reached. At that point, it changes to open, interrupting the circuit. But the input to my controller senses NO (normally open) switch contacts
(Read More…)
