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Electromagnetism

18 posts
Good Electric Strikes are not cheap. Yes, you can buy one for 30 - 50 dollars but in the end, you might not like it. Remember here is definitely: You Get What You Paid For It. So think twice before you drop your bucks on some cheap imported crap!   A Von Duprin is a heavy duty strike with a 24-volt  AC or DC coil. The cool part about this strike that it has Dual switch monitoring option has two SPDT contacts, one switch monitors the tripper which is depressed when the latch bolt is i ...
I have done some more work today on the current amplifier and found that I did not have the input turned up to a high enough voltage to obtain the full 1A output, so I have now repeated the test and monitored the heat output from the amplifier.   This is still just within the nominal operating temperature specified for the op-amp, but it was still climbing slowly when turned off. When switched back down to a 0.5A output, the temperature does start to drop away quite rapidly.   With ...
Introduction When making electromagnets, it is difficult to know for sure what kind of magnetic flux density has been achieved. This is because it depends a lot on practical construction factors, where on the electromagnet it is measured, and the core material permittivity. There are commercial measurement devices, known as gaussmeters, but the good ones usually cost upward of $150. Furthermore, those $150 units are basic – they have a response up to 300Hz (for changing magnetic fields) an ...
I haven't had much chance to work on the clamp table this week so it isn't quite complete, the majority of the time has been spend building and testing the current amplifier after the PCB had arrived.   For the clamp table,  I have cut some wooden legs for it and fitted them but they will need painting before final assembly. I have cut and profiled a base board for the table to sit on, this received a final coat of paint today, that is currently drying.  Five rubber feet will fin ...
Electromagnetism Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   Before building this device I have tried lots of different design but in every circuit there were some issues, either it was also a metal detector or detect human as AC voltage source. I even built a device using instrumentation amplifier, 2nd order band pass filter and ARM mcu to do all the math (FFT) S ...
Electromagnetism Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   After all the painting and finishing off the One String Electric Guitar has been finished. I re-installed the pickup and wired it directly into the headphones amplifier  as this enabled me to create an untethered system that I could then plug directly into the main music amplifier that I have. It wo ...
Electromagnetism Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   Once the final guitar body had been shaped it was time to paint it. I decided to follow a painting strategy of undercoat then top coat of spray paint. The undercoat was just a wood primer and undercoat combined, which I sanded down after the first coat and then undercoated it again and sanded it again to ...
Electromagnetism Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   No wires, no batteries, no solar panels, no screws, no glue and no suction cups, but a Klingmagon Subspace Probe can scavenge power to operate and cling to a vertical window without supports. I have been planning to build an outdoor digital thermometer for a long time that uses a temperature sensor and ...
Electromagnetism Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   IntroductionFor my entry in the electromagnetism contest, I decided to look at building some current clamp table adapters. The intention of these was to allow me to test the full-scale range of current clamps utilising my single phase injection test set. I also intended to look at trying to test the frequ ...
Having created the prototype one string electric guitar body and pickup I wanted to be able to hear the sounds it makes. I don't have a guitar amplifier so I decided to use an ordinary music amplifier instead but this needs a pre-amp to make it work. There didn't seem to be any such thing as a guitar pre-amplifier, all I could find were expensive foot pedal pre-amplifiers which were not for me. Then I stumbled across electric guitar headphone amplifiers, which do exactly what I wanted, so I purc ...
As the prototype body for the one string electric guitar has been completed the next step is to make the pickup coil. I have previously made a 3D printed bobbin to wind the coil on so all I need now is to select the wire to be used and wind it. I have selected the thinnest wire I had, which is 'pretty thin' (that's a technical term for non-mechanical engineers like me) which I think is 32 SWG or 38 SWG. It is so thin I can barely see it, even with my glasses on. It is enamelled so that the coils ...
I thought I would start the building of the guitar body with the pickup itself. As I have a magnet which I think is suitable I decided to 3D print a bobbin that fitted it to hold the winding coil. The magnet is 8 mm in diameter and 15 mm in length so I looked at making a bobbin with these dimensions. I also looked at what wood I might have available as that might have an impact. I found some pine plank that is 22 mm thick and 71 mm wide and about 750 mm long. I don't know how long a guitar shoul ...
I saw the Project14 monthly topic of Electromagnetism and thought about it for a bit and couldn't think of anything that I could do - there didn't seem anyway of involving mobile robots in this, so I had decided not to participate. Some time later it occurred to me that maybe I could make some sort of electric guitar. I am no musician but I can just about plink out Doh-a-deer, a female deer on the piano with one finger. I can just about do the same on a guitar so I thought maybe I could make a o ...
Here is more a tutorial to make a battery i remember when i was young to have made one of this have a look at the link, it's not mine (wiki source) but i know how to make it!   https://www.wikihow.com/Make-a-Homemade-Battery   Here is shown how Elettrolisis works it's in Italian i'm sorry (not my source):   http://www.icsgioiasannitica.gov.it/wp-content/uploads/2014/06/elettrolisi.pdf   Ciao   Toolkitman ...
toolkitman

Cigarette computer

Posted by toolkitman Feb 23, 2019
I was thinking after seeing the size of the Raspberry Pi Zero to how the measures will be the next two generations of desktop computers. I guess they will not be wider than a cigarette and you will come to the suppression of the USB ports and HDMI and SD CARD using the bluetooth and wifi, POWER SUPPLY will be replaced by a small battery or solar cell. In practical technology we will have a big computer as a next-generation microprocessor. It will be wearable100 per cent but being very careful to ...