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Build Long Range Laser Window Bounce Listeners
and Optical Voice Communication Systems

Remarkable concept where you listen to sounds picked up from a reflecting surface illuminated by a laser. These light reflections, or scatter, are reproduced back to the original sound by our special optical receiver.

Assembled laser and receiver modules may be placed on video tripods and temporarily aligned for limited performance demonstration systems. They may also be enclosed as shown in the instructions for use as a field worthy device with a potential range of up to 500 feet. May be used as a long range laser voice communicator with a range usable to 10 miles line of sight. Low cost audio surveillance science project or useful device for listening to power line faults, over pressured pipes, etc.

Plans show 3 systems ranging from a low cost science project to a long range infra red surveillance system. Includes LVC1 long range optical voice communication system.

LWB9 - Plans and Data for Complete System (By Download - $12.00) ............$25.00

Up to 100' Science Project Demonstration System You setup on individual video tripods. LWB6K - Includes LM650P3Laser Diode Module and LLR3K Optical Receiver Kit for 100' Demo/Science Project ...............$129.95 LWB60 - Includes LM650P3Laser Diode Module and assembled LLR30 Optical Receiver Ready to Setup and Use ..........$159.95

Up to 500' Invisible Red High Performance System You supply and build a precision mechanical enclosure with optical alignment features to house our CWL20 infrared laser for the illuminator and our LLR40 voice filtered optical receiver with basic collection lens. Also includes a visible red laser module test tone oscillator for initial system alignment and modulator for optical voice communicator. See below descriptions. ASSEMBLED UPON CUSTOMER’S ORDER USUALLY WITHIN 24 HOURS LWB9K - CWL20 Infra Red Laser Kit and LLR40 Kit .....................$349.95 LWB90 - Assembled CWL20 Infra Red Laser and LLR40 ...........$499.95

Ultra Sensitive High Performance
Optical Receiver

Cylindrical Enclosure Easily Retrofits To Tripod Includes Headsets 9 Volt Battery Operation Adjustable Gain Control Sensitivity Adjustment

Low Cost
Experimenters Optical Receiver

LLR3K - Kit/Plans..................................$69.95
LLR30 - Ready To Use.........................$99.95

Continuous Wave
Infra Red Laser and Collimator

Illumination source for night vision, target designation controller and laser bounce systems long range optical voice communicators etc..

30 mw@980 nm 1 milliradian Divergence Input 3 volts@ 60ma Includes x7 Collimator Class IIIB Compliant Cylindrical 7" Length Available As Kit or Assembly

Light Beam Transceiver

Two way optical communicators provide crystal clear performance when properly aligned. Can achieve ranges over 1000 feet! Excellent winning science project. The minimal kit includes the harder-to-find circuit boards and optics for this project (other components must be provided by you); the complete kit includes all parts. LBT1 - Plans (By Download - $4.00) ............................................$8.00 LBT1K-1 - Minimal Kit (plans, pc boards, and optics only) ....$49.95 LBT1K - Complete Kit (includes all parts) ..............................$129.95

Test Tone and Voice
Modulator Modules

Board level circuit is used with our diode lasers to produce a test tone, simplifying window bounce systems. Also modulates lasers for voice communication projects. Operates on a 9 to 12 volt battery with sensitive FET mike and level control. MODUL1 - Plans ............................................$6.00 MODUL1K - Kit/plans ..................................$29.95 HNM3 - Plans for HeNe Lasers (By Download - $3.00) ....$6.00 HNM3K - Kit/Plans for HeNe Lasers ...................................$29.95

PO Box 716, Amherst, NH 03031-0716