Laser Pointer - Across and Along The Track Detection

This train detector makes use of hand held laser pointer devices that are widely available to detect trains over long distances.

A laser harp

A laser harp is basically an instrument which somehow resembles a real harp. There are no strings. Instead, beams of laser light are projected from the bottom of the harp. These beams strike light sensors at the top of the frame. (or are picked up reflectively by sensors at the base of the harp) When something (a hand, foot, etc.) blocks a beam, a note is triggered on a synthesizer or some type of tone generator. Theoretically the harp could control anything.

10mhz to 20mhz laser light detector

This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system. It has good ambient light immunity.

10 MHz to 20 MHz laser light detector

circuit was originally designed to detect laser light pulses for an optical Ethernet communications system, good ambient light immunity

20 MHz VCSEL 3 mW laser test circuit

this circuit shows how to drive the laser device from a single high speed CMOS IC, circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that dont require light output control circuits

20mhz vcsel 3mw laser test circuit

This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that do not require light output control circuits. The circuit shows how to drive the device from a single high speed CMOS IC.

Experimental laser data link

Laser / Led Light Output Intensity Meter

This circuit uses a large 1cm X 1cm silicon PIN photo diode and a transimpedance amplifier to measure the light power output of infrared and visible LEDs and laser diodes.

Laser Diode and HeNe Laser Information

long laser circuit includes laser poswer supplies and modulation circuits

Laser diode driver with feedback