Educational

This R.F. listening device locator kit will detect any transmitter sending AM or FM, or just CW frequencies anywhere from tp to 450mHz. Peak sensitivity in the 80 to 120 MHz portion where many bugs would be found. Signal strength is indicated on a bargraph - the closer to the source, the higher the indication. Operates on a 9 volt battery for portability.

This analogue sound level meter features: 7 sound level ranges, A & C weighting for sound analysis, fast/slow response, battery level indication and RCA output jack. Specs: - positions: 60, 70, 80, 90, 100, 110, 120dB - load impedance: 1kohm min. - distortion: 2% at 1kHz, 0.5V - microphone: electret condenser microphone, omnidirectional, directionality increases at higher frequencies - precision: ± 2dB at 144dB - output signal: max. 1V deviation at 1kHz for the entire range - power supply: 1 9V battery (incl.) - battery test: OK indication between 7 and 10.5V - battery life: 110 operating hours (alkaline batteries)

Digital multimeter with L & C function. 3 1/2-digit DMM - 10A / temperature / capacitance / frequency. Features: * 39 measuring ranges * low-battery indication and overload protection * transistor, diode and audible continuity test * DC current max. 10A, DC voltage max. 1000V * AC current max. 10A, AC voltage max. 700V * resistance measurements: up to 20Mohm * capacitance measurements: from 2n to 20µF * inductance measurements: 2m to 20H * frequency measurements: max. 20kHz * temperature test range: from -4°F to 1832°F * with TTL logic test function * with holster * K-type thermocouple measuring range: from -4°F to 1832°F (not incl)

Deluxe molded project box features threaded brass insters in top and bottom for security circuit board assemblies. Case is secured with 4 screws and threaded brass inserts. Top & bottom are light gray, front & back are dark gray. 7-1/2" L x 4.0" W x 2-7/8" H.

Sensor-activated robotic car. Changes direction when sensor detects noise or the car hits an object. Uses microphone as sound sensor, requires 2 1.5V AA batteries (not incl).

Robot "frog" moves forward when sound is detected and repears sequential movements: forward, stop, left, right. Comes with 2 sets of gear motors (unassembled) and takes 2 1.5V AA batteries (not incl) and a 9V battery (not incl). Special educational discounts!

These are especially favored by schools. You get a set of 10 jumper cables - 2 of each color. Red, Green, Yellow White & Black. Extra heavy duty 16 gauge flexible wire. 22" long.

This pre-assembled sensitive ultrasonic motion detector circuit uses a quartz crystal to lock the detector frequency for maximum stability and reliability. It was originally designed for use as a parking distance detector. It provides a digital, analog and relay output. Features; Buzzer output: fast/slow/continuous. Distance indication with 3-LED-bar. Adjustable alarm distance. LED alarm indicator. Dry contact NO/NC relay. Applications: robot projects, object detection, distance measuring, parking aid, security systems, etc. Range: 0.66 to 8 ft. Frequency 40kHz. Operates on 12VDC/200ma.

A complete set of parts (battery not included) and instructions to build a real live, working motor. An introduction to the workings of the DC electric motor. A creative experience that no junior experimentor will ever forget. "Watch it come to life" A number of experiments are included in the instructions, which the teacher can use to get young minds thinking. Snaps together. No soldering required. Operates on one AA battery. Contains all you see here.

Our source has offered us 370,000 magnets. The item numbers and descriptions and (quantities) are so; 12-23217-01 MAGNET, PINCUSHION 6.0 GAUSS T E4 E (20,000), 12-23217-02 MAGNET, PINCUSHION 8.5 GAUSS T E4 E (25,000), 12-23217-03 MAGNET, PINCUSHION 15.5 GAUSS T E4 E (252,036) 12-23217-04 MAGNET, PINCUSHION 4+-1 GAUSS T E4 E (29,000), 12-23217-05 MAGNET, PINCUSHION 12+-2 GAUSS T E4 (24,000), 12-23217-06 MAGNET, PINCUSHION 18+-2.5 GAUSS T E4 (6,000), 12-23217-07 MAGNET, PINCUSHION 24+-2 GAUSS T E4 (14,000). Anyone out there have any interest?

Now an inexpensive CCTV surveillance camera. Cameras like these used to cost $60 and more. Works on 110VAC with the adapter supplied or can be operated on a 9V battery. Use for security, observation, experimentation etc. Specs; 1/4" B/W CMOS. 352x288 pixels. CCIR (PAL), 380 TV Lines. Minimum illumination 0.5 Lux/F1.4 S/N ratio 48dB. Electronic shutter 1/50 to 1/5000 sec. Gamma correction 1.0 Auto adjustments; exposure, gain & gamma correction. Lens 13.6mm. Viewing angle 92 degrees. Video output 1.0Vpp composite, 75 ohm. Audio output to RCA connector. 8VDC/80ma regulated power supply (included). Size 1.65" x 1.50" x 1.10". Operating temp. 14 degrees F to 113 degrees F. Weighs 2.12 oz. Buy several at our LOW price.

Connect up to 8 headsets to one audio source. Used by many school teaching systems and language labs. Provides private listening for up to 8 individual persons. Individual volume control for each channel. Multiple units can be cascaded to accomodate more that 8 persons. Operates fro any 8 ohm source to 8 ohm headphones. Supplied in black crackle finish. 9' connecting cable with standard 1/4" phone plug. 4 rubber feet. 50W maximum load.

Magnetic rubberized orange vinyl sheet, 5" x 8" x 0.035" Flexible. Can be cut with scissors or knife. Sticks to refrigerator, file cabinet or automobile. Use for signs, visual aids, displays. Clic pic for bigger image.

Tiny 0.18" x 0.18" x 0.08" plated neodymium block magnet. Available in large quantity.

Ferrite bar magnet. 1.86" x 0.87" x 0.18"

Powerful 1" diameter x 0.185" thick neodymium disc. Shiny nickel-plated finish.

Cylinder magnet. 0.475" diameter x 0.375" high with 0.25" hole. Shiny nickel-plated rare-earth, neodymium magnet.

Powerful round neodymium magnet. 1" diameter x 0.125" thick shiny, plated disc.

This credit card scanner uses an optical system to read the raised numbers on a credit card into a photo array. A small AC motor drives the credit card through the reader. 5"x 5" x4". Used. With diagram.

Great for shop, lab and tool kit. 5 rolls of 22 gauge, solid copper wire with PVC insulation. UL listed 1007/1569. This is the standard at board level. 5 rolls. one each black, white, red, green, yellow.

19 range pocket digital multimeter with transistor checker and continuity buzzer. Tiny only 3-3/4"L x 1-7/8"W x 1"H. Measures AC & DC voltages and Resistance. Great for shop, lab, classroom etc. Super value.

A sweet little pocket multimeter at a "silly" low price! 13 ranges; 10, 50, 250, 500VAC. 10, 50, 250, 500VDC. 50, 250MA, Ohms & dB, Complete with battery & test leads. Measures 3-1/2"L x 2-1/4"W x 1-1/4"H. Designed & engineered in the USA. Manufactured in China. So inexpensive you can afford to "sprinkle" these around the shop, lab, classroom or factory. Imported for ongoing availability.

Amazing value. Great for schools. 13 ranges. 2-1/4" mirrored movement. Protective fuse. 1-3/16" D x 2-3/8"W x 3-1/2"H. DC Volts; 0-10/50/250/500. AC Volts; 0-50/250/500. DC Current; 0-50/250MA. Ohms; 0-1 meg mid scale. Decibels; -20 to +56db. Good/Replace battery tester scale. Complete with test leads, AA cell and English/French/Spanish instruction booklet. Blister packed for retail sales. Made in China. Imported for ongoing availability.

These were originally installed in motel rooms to play tapes rented from a vending machine in the lobby. We have 525 units available as removed in working condition when the motel changed over to another system. These heavy duty VHS players could be very useful for schools. Offers will be considered on the entire lot. Call Ted at 514-739-8723.