Hobby projects - Simple electronic circuits. Computer microphones Learn how to interface electret and dynamic microphones to the standard computer sound card. Metal detectors Theory of operation and schematics of the most common metal detectors used today: Very Low Frequency (VLF), Pulse Induction (PI) and Beat-Frequency Oscillator (BFO).
Wireless microphone The wireless microphone transmitter can be built in an afternoon with simple, affordable and widely available parts. Handbook of hardware pinouts, cables schemes and connectors layouts. Arduino Pong. //Arduino Tv framebuffer//Alastair Parker//2007 // Video out voltage levels#define _SYNC 0x00#define _BLACK 0x01#define _GRAY 0x02#define _WHITE 0x03 // dimensions of the screen#define WIDTH 38#define HEIGHT 14 //number of lines to display#define DISPLAY_LINES 240.