ELECTRONIC KITS

Please Note! Once you have opened these kits, they are not returnable. 
All parts are supplied, except batteries unless noted otherwise.
Kits on this page require assembly which includes soldering and testing. 
Some kits require permission of parties involved before use.

4.5 DIGIT LCD COUNTER KIT
Circuit designed around a single Harris ICL7225 IC that contains digital and LCD driver sections to provide a simple yet versatile general purpose counter. 5V TTL signal levels for input and control (Reset, Store, Carry, Inhibit). Runs on 9V battery. 3.25" x 2.125" x 0.75".
Kit 36 $49.95 each

5-LED FLASHER
Five Ultra Bright LED's flash in seven patterns. The modes can be cycled through using an on-board SPDT switch. When the desired flashing pattern is found just leave the switch there and the pattern will remain flashing as long as power goes to the board & the switch remains set. COB PCB measuring 3cm x 1.5 cm. October 2000. Now with trimpot to vary flash rate.
Kit 37  $7.95 each

The two kits below ( Kit 40, and Kit 42) are based on a pre-programmed Motorola 681HC705KT IC, a general purpose 8-bit, 16-pin microcontroller. The idea here is to acquaint you with microcontrollers. Information on programming and software is readily available from Motorola at a very reasonable cost. Software disk provided to show the program in the IC and the flowcharts. The program in the ICs in these kits is not changeable.

REACTION TIMER KIT
This kit uses the microcontroller. to perform as a reaction time timer. One or two players can use this kit. A beep is sounded and player(s) press their button(s). Kit then displays the elapsed time from the beep and button actuation. Uses 9V battery.
Kit 40 $49.95 each

NUMBER CRUNCHER KIT
This kit uses the microcontroller. to perform as a base number converter. Press "STEP" button until number to decode is reached (0-255) then press "MODE" switch to display normal decimal, normal hex, two's complement hex or two's complement decimal. Displays on LED and 7-segment display. Uses 9V battery.
Kit 42 $49.95 each

SPDT RELAY KIT
Ideal for those projects that need an external relay. Circuit board holds a small SPDT relay with 12VDC, 400 Ohm coil and contacts rated 5A @ 120VAC. Suppressor diode across coil. Terminal strips for power and relay contacts.
1.5" x 1.1875" x 1".
Kit 43 $7.95 each

DUAL SPDT RELAY KIT
Ideal for those projects that need one or more external relays. Circuit board holds two small power DIP, SPDT relays, suppressor diode across the coils. Relays rated 12VDC, 700-Ohm coils and contacts rated 1A @ 120VAC. Terminal strips for power and relay contacts. 2.0625" x 1.125" x 0.75".
Kit 45 $12.95 each

LM383/TDA2002 AMPLIFIER MODULE
A proven & popular power amplifier building block for use in any audio project. Power output is dependent on the supply voltage and load resistance. Over 10W is typical for a 16V supply into a 2 ohm speaker. A 12V supply into a 4 ohm speaker will deliver around 4W. Small heatsink provided. In late 2000 the LM383 was discontinued but the TDA2002 is a direct replacement.
Kit 47  $16.49 each

INTRODUCTION TO AUDIO POWER AMPS
Kit uses discrete parts to construct a Class A and Class A/B power amplifier that delivers over a Watt into the supplied 8-Ohm speaker. Hands-on learning about bootstrapping, crossover distortion, push-pull outputs and complimentary pairs. Uses two 9V batteries. Terminal strips for inputs and outputs.
Kit 48    $13.95 each

CRYSTAL LOCKED ULTRASONIC MOVEMENT DETECTOR
Our first ultrasonic movement detector - Kit 20 - has been very popular. This is another circuit design which we believe is more sensitive with fewer components. The transducers are mounted on the same PCB as the circuit
Kit 49  $29.95 each

25WATT HIFI AUDIO AMPLIFIER MODULE
Kit contains the essential components to build a hifi amplifier module using the LM1875 IC. Heatsink, speakers and cables are to be supplied by the user.
Kit 50 $12.49 each DOCS

Miniature FM Transmitter

Five Ultra Bright LED Flasher
Five Ultra Bright LED's flashing in random or in sequence. Uses a COB (Chip-on-board) PCB measuring 3cm x 1.5 cm. The flashing frequency is set by a single external resistor between 300K and 1M ohm. A pad connected high determines the random or sequential flash pattern. A second pad connected low determines whether the flashing is continuous or set by a toggle switch. • Excellent project for schools since the project is very safe: uses 2 x 1.5V batteries, can be easily put together within 30 minutes, teaches the latest electronic technology as found in games and toys and give an strong visual result when it is finished. Comes with a motherboard to aid attaching the components to the COB PCB. Documentation
Kit 52 $9.95

Negative/ Positive Ion Generator
Ion generator powered by 110-240V mains supply. It uses the standard Cockroft-Walton multiplier circuit - a ladder of diodes and capacitors to pump the output voltage up to the level required. Fuse built into the PCB. Uses ordinary needle work pins as the ion emitters. Neon indicator to show when the power is on. Reversing the 1N4007 diodes makes it a positive ion generator. The user must supply a suitable box for this project. • CAUTION: This is a high-voltage, mains supply project. The user must take extreme caution!
Kit 57 $19.95

IR REMOTE TOGGLE SWITCH

78nn-REGULATED POWER SUPPLY
Kit accepts an unregulated AC or DC input. The user supplies a standard 3-pin voltage regulator from 5 volts (using a 7805) to 24 volts (7824). The full range of possible regulators is: 7805, 7806, 7808, 7810, 7812, 7815, 7818 & 7824. Large heat-sink provided. PCB = 64mm x 40mm (2.5" x 1.5").
Kit 60 $8.49 each

3½ Digit LED Panel Meter (using 7107)
Make this general design 3½ digit LED panel meter into your own voltage or current meter. Or customize it to measure  input from a transducer. Full details given in the documentation. Separate display PCB. 7107 Data Dheet .
Kit 61  $21.95

COMPONENTS FOR PIR DETECTOR
We supply the three essential components to make your own PIR movement detector: a PIR sensor, PCB-mounted Fresnel lens, plus the latest movement detector IC. Eight pages of application notes show you how!
Kit 62 $17.50

One Chip AM Radio
Complete AM radio on a PCB. Tuned radio frequency front-end, single chip RF amplifier & detector and two stages of amplification of the audio signal into a speaker. All components supplied. Coil pre-wound. Excellent for schools. Uses MK484 radio IC. Documentation
Kit 63 $19.95

60/75/90 SECOND MESSAGE RECORDER
Single chip 60- to 90-second message recorder using the latest technology. Non-volatile memory. You can record any number of messages up to 60 or 90 seconds depending on the iC supplied. Then play back later. 6V operation. LEDs indicate record or playback.
Kit 64 $39.95 each DOCS

650NM 15MW Laser Diode

DC MOTOR SPEED CONTROLLER
Control the speed of any common DC motor rated up to 100V (5A). Operates on 5V to 15V. Uses NE556 to pulse-width modulate a IRFZ44 mosfet. In this way motor torque is maintained. Adjustable speed control. Box mounted. Spec Sheet
Kit 67  $17.95

POWER SUPPLY MODULE USING LM317T
This is a basic adjustable voltage power supply using the popular three pin regulator, LM317T. You can select any voltage between 1.5V and 30V using a potentiometer. The LM317T is rated at 1.5A so you must use a larger heat sink when drawing high currents. Spec Sheet.
Kit 68  $11.59

THREE X 8 CHANNEL IR TRANSMITTER & RECEIVER
Control 8 relays using this IR Remote Control Unit . Over 20 meters in sunlight. Uses 2 high-powered IR LED's & latest IR detector/decoder from Kodenshi. Transmitter case, 8 miniature relays & all components provided. Uses paired encoder/decoder IC pair. Full instructions included. Four ranges set by jumpers. Spec Sheet  and IR Receiver Module.
Kit 72  $72.50

Big PIC Clock
This is a big digital clock using 2.3" LED displays for the hours and minutes. It can operate in 12-hour or 24-hour mode. The software program including a time adjustment mode can control the clock to a few seconds a year. This project was originally published in the Australian electronics magazine Silicon Chip , March 2001. The fully annotated software for the kit is available here. Documentation - Schematic
Kit 73 $114.95

PC Printer Port Relay Board
Do you have an old PC lying around the house which absolutely no one wants? Then you can convert it into a dedicated controller. Communicate with the real world via the parallel printer port on your PC. Simply connect printer cable from computer to Centronics connector on relay board. (Revised circuit 8/2001 replaces the expensive Centronics connector with a D25 right angled, PCB-mounted connector.) There are 8 relays each capable of switching 12VDC/10A or 240VAC/5A. Each relay has an LED to indicate when it is operated. We provide two sets of complete, stand-alone software to control the relays: one works under DOS so you can write your own batch files to control individual relays, the other under Windows 3.1. • Windows software for Kit 74 written 11/2002. W9x/NT/2000. Download it here k74_win.zip. Linux software for Kit 74 has been written by James Cameron. You may get it at http://quozl.netrek.org/. • Website for a site using Kit 74 is http://www.thebells.net/Halloween/PLCC/PLCC.html.
Kit 74 $47.95

DC Motor Kit

2 CHANNEL UHF SWITCH KIT
Uses two button key ring UHF transmitter to toggle two relays on/off on a receiver PCB up to 40 meters (131 feet) away. 300MHz to 375MHz transmission frequency set by trimcap. DOCS
KIT 82 $47.50

TELEPHONE LINE SWITCHER
Turn on/off up to four relays over the telephone. Dial up your phone from anywhere in the world, input your pin number then turn on or off any of 4 relays. Use the relays to control any devices you have in your house or office. The pin number is set by 4 on-board BCD rotary switches. The circuit has the required telephone line protection circuitry built-in (but non-approved.) The standard line impedance termination can be customized by the user for their own particular country if they want to get better impedance matching. 12V DC. 68HC705K1 controlled. All source code comes on floppy disk with the kit. The LED's in the photo are for testing to give a visual indication that the relays are working.
Kit 86  $64.95

1W STEREO AMPLIFIER MODULE
This stereo amplifier module uses the Samsung KA2209 8-pin IC. This is equivalent to the TDA2822. The circuit is the standard text-book circuit for this chip. No heat sink is required.
Kit 87  $7.49

2 X 10W STEREO AMP KIT
The TDA2009 is a class AB dual Hi-Fi Audio power amplifier monolithic IC designed for quality stereo applications. This is the standard data book application circuit using a minimum of external components. Each channel is capable of delivering 10W into 4-ohm speakers. Recommended supply voltage 8-22V. DOCS

KIT 88 $19.95 each

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