This project uses a Microchip PIC microcontroller and an Infra-Red LED to act as a PC controlled cable TV changer. A very simple program on the computer sends the channel number over RS232 to this PIC based IR transmitter which creates the correct waveform for the digits to be sent. Source: Andrew M. Bishop

Source: escol

Having recently tested a lot this method, I’ve finally determine my “easy and cheap” way to build PCB using toner transfer method. Source: sirblog

Lithium-Ion cells require a constant voltage, current limited charge. The voltage must be accurately limited to 4.2V, as higher voltage reduces cell life. This circuit is designed to meet these requirements using standard components. Source: bhabbott

The circuit consists of two parts, a constant current generator using a PNP power transistor (Q2), and a peak-detecting shutoff circuit using a high-gain opamp (IC1). To start the charge cycle, switch SW1 is momentarily closed, causing C1 to discharge. As IC1′s inverting input is now higher than its non-inverting input, its output goes low, [...]

Tired of switching having to manually switch between his headphones and computer speakers, Peter Lavelle decided to go all out and built a LAN-controlled audio switch to solve the problem. Source: solderintheveins

Ever feel like you’re missing some beats? Does your day need a better soundtrack? Feel the boom with the Super GrooveAxe! It’s a pocket sized, battery powered drum machine & sequencer that you can take anywhere. Source: nmcclana

The Garage Parking Assistant makes it easy to pull in the garage by signaling you with a traffic-light style display of when to pull in (GREEN), slow down (YELLOW) and stop (RED). If you pull too far in the Red LED blinks to let you know. Although this type of project has been done before [...]

These LEDs are magic, inside the ordinary looking LED dome there is actually 3 LEDs along with a tiny controller that sequences the lights in some cool patterns. Stay tuned for a peek inside one of these LEDs! It first cycles the individual colors quite rapidly, and that is followed by some slow color fades [...]

Download Service Manual :Chassis GPU15KE-GPU20KE Model:LE15S51BP-LE20S51BP-LE20S52BP

The star is about 35cm across and designed to be displayed indoors in a window. I originally created the star three years ago using a 16F872 controller. The original version worked ok – but had no spare memory for adding more features. This new version uses a 18F2620 because I now prefer the 18F series [...]