Speed controller circuit for radio controlled boats…
“This application note describes a circuit designed to control the speed of a dc motor used in radio-controlled boats. The electronic speed controller (ESC) is a “no-brake, forward-only” controller. I wanted to keep the part count low and the circuit simple so a couple features were sacrificed. The circuit does not have: over-current protection, over-temp protection, polarity protection, or over/under voltage protection. All the parts can be obtained from digikey distributors. The circuit was designed with a popular 12-cell model boat motor in mind (graupner speed 700). This project was my first attempt at using Bascom-avr and Atmel microcontrollers. ” Thanks JasonR! Link.
Interesting tactic, people were driving too fast in a neighborhood, so the neighborhood built “roadwitches” – “These type of “DIY traffic-calming happenings” are described by their creator as “roadwitches” and have included an 11-feet high rabbit, a big bed (for a sleeping policeman), a Casualty-style fake crash scene for Halloween and the setting up of a living room in the middle of the road.”
Rick writes “After reading a post in MakeZine about
Nick writes “Want an inexpensive Windows CE-based web browser, email client, MP3 player, voice memo recorder, rudimentary games machine, and home automation X10 controller that will also create and edit Microsoft Word and Excel files with handwriting recognition and 16-bit color in a package that resembles a space-age Etch-a-Sketch?…this is it”
Trevor writes “Here’s a simple mod I did to an old telephone reciever to make it compatible with my laptop- for use with Skype. I tried using the original coiled telephone cord, but for some reason I couldn’t get adequate microphone volume through it. Funny, because telephones are made for talking…”
PDF downloads on how to make those cool (but expensive) enclosed glass ecosystem – “Here you have the choice of two different ecosystems, a “dry land” ecosystem like the one in our Virtual Ecosphere and a marine aquatic one.” [
Wow, now you can upload a PNG image and have a part cut and sent to you, made from metal or plastic, no need to use CAD software. Simon