If you are looking to design some underwater propulsion Dane from Transistor Man has completed a well documented Submersible Thruster build to get some pointers from. “The goal here is to design a submersible motor assembly that is able to accomplish the following: Able to operate, submersed, up to 1 meter underwater while not transfering more than 10ml of coolant into the surrounding water per hour (not leaky) Capable of
Afrotechmods shows us how a Class D Audio Amplifier works and how to build one. A TPA3122 is a class D amplifier on a chip. There are no external power components needed since class D amplifiers use mosfets for switching and thus the heat dissipation is low enough that it can be squished into the DIP package with no heatsinking needed. “The TPA3122D2 is a 15-W (per channel) efficient,
Having your technology save you time is great. NYC CNC doesn’t have to sort his spent bullet casings any more since he has built this Arduino Sorting Machine. It has an automatic feeder which drops the casings onto a roller, the roller opening is slowly enlarged until the casing falls through. The system then sorts it based on the size.
Ben Heck attempts three different methods for making a prototype PCB. The methods are the toner transfer method, the laser etch method and the good old hand drawn method. I was surprised that Ben didn’t use his CNC machine as a fourth method. “He’s designed PCBs in Eagle and sent them off for production at a board house, but this doesn’t help when he wants a PCB the same
Our friend Bob Davis built a DIY CNC Pendant that allows him to control his CNC machine without spending big dollars on a commercial type. His version makes for a nice quick build since it uses parts that you probably already have in your junk bin. The main items you need are some switches and a 555 timer. If you have an old game controller you might want to
Ben Rothschild sent in details of his latest build, it is an Electric Go Cart Built from Scratch. It has a top speed of 22 MPH and a range of 5 miles. The power comes from 2 Turnigy brushless outrunner motors and a large LiPo battery pack. There is lots of versatile 80/20 and brackets holding things together. He designed the system plans in CAD and made a
If you like playing chess this Wall Mounted Computer Chess Board Project might be something that would be a good project to add to the list. It has a vintage chess game hacked into this hand made wall hung chess board. Thanks to Artless Dodger for sending this in. “Parts Needed Working Fidelity Chess challenger 8 or 9 Power adapter 8v Coin cell battry 3v MDF 6mm board
