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Fun Stuff

Transmits a modulated infrared light beam up to 30 feet without lenses, up to ¼ mile using simple lenses. Since the beam is modu-

lated with a 30 KHz carrier (like AM radio) there is no effect from 60 Hz hum that is produced by indoor lighting. Easily transmits

through windows - ideal for “bugs” or listening to IR television remote controls. The transmitter can use any type of mic and is very sensi-

tive. The receiver employs an IR PIN diode detector and there is enough power to drive any loudspeaker or earphone.

The PC board is cleverly “scored” so you can easily separate the Transmit and Receive sections so they can be used individually to transmit at one loca-

tion and receive at another. Units run on 9 to 12 VDC and will use a standard 9V battery. The LB56 has been a popular kit for years and makes a great sci-

ence fair project to show how you can send audio over Infrared! Custom case set measures 5”W x 1½”H x 5¼”D. (First, two paper cups & string, then soup cans, now IR beams!)

LB56C Infrared Light Beam Communicator Kit With Case $34.95

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Send your voice over light - even through windows!

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30’ to ¼ mile range!

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Receiver drives a speaker or earphone!

Voice Over An IR Beam!

Infrared Light Beam Communicator

KIT

LBC6K Laser Beam Communicator Kit (Includes Receiver, Transmitter and Pocket Laser Pointer) $59.95

LBC6K2 TWO Laser Beam Communicator Kits, for Duplex or Two-Way Audio (Save $10.00!) $109.95

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Modulated at more than 16kHz for excellent voice audio fidelity

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Uses standard pocket laser module for ¼ mile maximum range (included)

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Each kit includes one transmitter and one receiver

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Includes microphone and digital AGC circuit for full audio range control

Now you can talk to your friends over one of the most secure long-distance transmission types available, a laser beam! Our

new laser beam communicator allows you to talk with pretty good fidelity to your friends up to ¼ mile away just using a

pocket laser pointer.

The transmitter uses a microphone or external audio to modulate a laser beam on and off at a rate of more than 16kHz so the audio fidelity is much better

than that of a telephone. A telephone is limited to 3kHz, but the LBC6K is limited to 6kHz. The receiver includes filtering to remove the 16kHz carrier and leave behind the

high quality audio, and then boost its level for use with earphones. To improve the fidelity of the system, the transmitter employs audio AGC on the microphone to boost weak audio,

and reduce loud audio so that the listener never misses a word.

Each kit includes a transmitter, receiver, and pocket laser pointer. This gives you a complete one-way audio path. If you need full duplex, or two way, buy two at the special price!

Receiver and transmitter are designed to fit in two pieces of 2” PVC pipe for easy mounting and alignment. Each runs on a standard 9V battery, DC adapter or AC adapter (not includ-

ed). Audio output drives a standard personal stereo headset. Your friends will be amazed when they see you talking over that red laser beam! (My kids built a couple of these and

were really amazed! But then they asked me why they couldn’t see their voice change the laser beam light... I told them “Um... ask your Mom!”)

LASER

RECEIVER

LASER

TRANSMITTER

Send Audio Over That

Laser Beam!

Laser Beam Audio Communicator

KIT

Here’s a kit that’s not only a ton of fun for everyone, but is useful too! This low cost microwave radar uses the same

principle found in police units costing thousands more. You’ll turn heads when you clock cars, planes, runners, boats,

horses, bikes, races, or virtually any large object that moves.

Speed readout is on two LED displays which can be set accurately (better than 1%) to show MPH, kilometers-per-hour, or

even feet-per-second. An earphone output allows you to hear the actual Doppler frequency shift of moving objects, the

theory upon which all radars operate.

Uses two 13 oz. coffee or juice cans for antenna (not included)... so start drinking! Antenna unit can be remotely placed up to 300 feet away. The SG7 is easy and informative to

build, with a detailed manual that not only carefully guides you to a finished unit but also tells you the hows and whys of Doppler radar. Even though the kit employs microwave cir-

cuitry, no exotic tuning is needed. All critical sections are PCB stripline and calibration is as easy as pointing the SG7 at a fluorescent lamp! Your Speedy kit includes a deluxe black

ABS plastic case with SPEEDY graphics for a neat professional look. Operates on 12-15VDC. Electronics case: 3 5/8” x 5 3/4” x 1 1/8”. (Yes, the coffee needs to be in cans!)

SG7 Speedy Personal Speed Radar Gun Kit $69.95

AC125 110VAC Power Adapter $9.95

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Direct readout in miles/hour, kilometers/hour or

feet/second

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1/8 mile range for average car-sized object

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Earphone output to hear actual Doppler shift

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The nation’s #1 science fair project!

YOU Be The Cop!

How Fast Was HE Going!

Speedy

Personal Speed Radar Gun

KIT

The TFM3C has three separate field sensors that are user selectable to provide a really cool readout on two highly graphical

LED bargraphs! Utilizing the latest technology, including Hall Effect sensors, you can walk around your house and actually “SEE”

these fields around you! You will be amazed at what you see. How sensitive is it? Well, you can see the magnetic field of the earth...

THAT'S sensitive! The technical applications are endless. Use it to detect radiation from monitors and TV's, electrical discharges from appliances,

RF emissions from unknown or hidden transmitters and RF sources, and a whole lot more! If you’re wondering whether your wireless project or even your cell phone is working, you

can easily check for RF! A 3-position switch in the center allows you to select electric, magnetic, or RF fields. A front panel “zero adjust” allows you to set the sensors and displays to

a known clean “starting point”.

If the TFM3C looks familiar, it’s probably because you saw it in use on the CBS show Ghost Whisperer! It was used throughout one episode (#78, 02-27-2009) to detect the presence

of ghosts! In the electric mode, the TFM3C’s displays will wander away from zero even though there isn’t a clear reason for it What it was in the Ghost Whisperer was a friendly

ghost. What it will be in your house... who knows! Runs on 4 AAA batteries.

TFM3C Tri-Field Meter Kit With Case $74.95

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SEE RF, electric, and magnetic fields!

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Watch the magnetic field of the earth!

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Sense different magnetic poles!

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Detect RF transmitter fields

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Graphical display “sees” invisible fields