Electronic Projects (Model 400/500 Series)


Size: 8.0" x 2.2" x 1.6"

411: Telephone Kit

Clear and white models

Pulse and tone dialing

2-color student manual

Highest education content

Lowest prices

411C (Clear) has colorful neon lamps that flash when the phone rings. Both models include comprehensive 2-color, 40-page manual that teaches telephone history and operation from the early telegraph to the modern-day telephone company central office. Step-by-step instructions and 49 2-color illustrations guarantee student success. Includes 2 PCBs, high-tech IC, transistors, diodes, high-performance microphone, conductive rubber keypad, wall mount cradle, baseboard mounting jack, and more!

Order No. 411--White

Order No. 411C--Clear

Size: 1.5" x 3.5" x 2.6"

502: 6/9 Volt Power Supply


Step down transformer

Battery eliminator

Neon pilot light

24-page student manual

AC operated

A beginner's project, Model 502 covers electronics theory including filtering, rectification, transformers, and more. The output is easily switched from 6 to 9Vdc and maximum current is 100mA. Use to power small electronic items such as transistor radios.


Size: 4.0" x 5.0" x 6.2"

523NB: Strobe Light Without Breadboard

523: With Breadboard

Variable flash control

32-page student manual

AC operated

Graymark's Model 523 Strobe Light is an intermediate project that covers basic electronics theory in the areas of RC timing circuits, gas filled tubes, voltage doublers, and much more. The flash speed is adjustable from 1 to 5 flashes per second and tube life is about 500,000 flashes.

Size: 5.75" x 3.25" x 1.75"

536NB: AM Transistor Radio Without Breadboard

536: With Breadboard

8 transistors

Push-pull output

88-page student manual

Battery operated

Superheterodyne circuit

Separate local oscillator

This popular advanced project covers radio receiver and superheterodyne theory in depth. The manual contains special sections on acoustic and electromagnetic energy, energy transfer systems, and development of the superheterodyne circuit. The radio circuit is highlighted by a separate local oscillator for high sensitivity and excellent selectivity., Requires one 9V battery (not included).


Size: 7.25" x 4.75" x 3.25"

540: Binary Clock

10 TTL integrated circuits

Voltage regulator

Binary coding system

80-page student manual

AC operated

This comprehensive advanced project contains a series of digital logic experiences covering Transistor-Transistor Logic (TTL) and the binary numbering system. Binary counters, AND, OR & NAND gates are discussed in detail. Areas of electronics theory include pulse shaping, transistors, rectification, and transformers.

Size: 3.6" x 5.0" x 1.7"

542: AM/FM Portable Radio

Use of test equipment optional

64-page student manual

16 PCB test points

Unsealed FM tuning section

3 IC superheterodyne circuit

Perform alignment and many experiments without expensive test equipment. Experiment topics include amplification, dB, feedback, distortion, heterodyne, modulation, demodulation, detector, and AFC. The state-of-the-art circuit and modern styling with LED tuning indicator, auto-off and comfortable headphones will give years of listening pleasure. Requires two AA batteries (not included).


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