DIY Electronics

Kits (page 2)

Kit 73 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

Kit 74 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. 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 here

Linux software for Kit 74 has been written by James Cameron. You may get it at Quozl's Open Source Work

Website for a site using Kit 74 is here

Another website explains simply how to connect a light to be switched by Kit 74 here

Kit 75 PIC Trainer

Kit 79 Three Circuits-In-One LDR Circuits

Scan of Kit 79B PCB

Scan of Kit 79C PCB

CdS Cell Specification Sheet

We provide 3 complete and separate Light/Dark LDR circuits each with a relay on-board all in the one kit. Each is a simple well tried circuit: one uses two transistors in a super-darlington setup, the second uses a LM741 op-amp while the third uses a Schmidt Trigger. Each board has a PCB-mounted switch to convert the circuit from light to dark switching and vice versa. There is nothing original in these circuits - they have been around for years. What we have done is bring three good timer circuits together all in the one Kit for you to build & experiment with

Kit 82 2 Channel UHF Relay Switch

This kit uses the RF transmitter and receiver units to control 2 relays. The transmitter unit has two control signal buttons. Pushing one button once turns on one relay. A second push toggles it off. Red LED's indicate the state of the relay so it can be viewed from a distance. 12V relay contacts 120V/10A. Full circuit diagram and explanation. By removing the 4013 and making 2 jumper connections you can go to momentary mode

Kit 83 Kit 83 Universal Power Supply

Picture of PCB

Put in your own 78xx and 79xx 3-pin regulators (TO-220 type) to give fixed positive and negative voltage outputs which you want for your project. Supplied with 2 small heatsinks. Requires centre-tapped AC voltage source. Dimensions = 78mm x 43mm

Kit 84 Mains Power Relay Switch

Picture of PCB

Many electronic projects use a low-voltage circuit to control the mains power supply eg. a touch switch, movement detectors, etc. In most cases the signal is brought out to a pad or terminal on the PCB. It is left up to the user to "use a suitable relay" to make the actual connection to the mains. Well this kit is the answer. It will take a +12V high or low going signal to switch a DPDT relay rated at 5A/240V. Both sides of the mains supply can be switched. A 5A fuse on one side is also included

Kit 85 Three-In-One Timer circuits

Picture of PCB 1

Picture of PCB 2

Picture of PCB 3

We provide 3 complete text book timer circuits all in the one kit. One is traditional 555 timer circuit, the second uses a 555 to pulse a counter while the third uses the discharge of a capacitor to time a period

Kit 87 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. New PCB and documentation june, 2004

Kit 88 10W+10W Stereo Amplifier Module

Picture of PCB

TDA2009A Data Sheet

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 10 watts into 4 ohm speakers using a 24Vdc supply voltage. Dimensions = 79mm x 50mm

Kit 89 Stereo VU Meter

Picture of PCB

A simple, low cost stereo VU meter. Two LM3915 dot/bar display driver ICs are used to drive 2 rows of 10 LEDs (14 green, 6 red) in a moving bar display. Each row of LEDs spans a power range of 0-30 dB in ten 3-dB steps. This VU meter indicates "peak music power" when used with audio amplifiers. Ideal add-on for any of the amplifier kits. Dimensions = 65mm x 42mm

Kit 90 3W+3W Stereo Amplifier module

BA5406 data sheet

A simple stereo 3 watt per channel amplifier based on the BA5406 power amplifier monolithic IC. Minimum component count. Runs on 12Vdc power supply. Good general purpose amplifier. Dimensions = 67mm x 38mm. Requires heatsink (supplied)

Kit 92 IR Remote Control & Decoder IC

This Kit uses a commercial 14 button remote control, unit to put an active low signal onto one of 14 output pins on a decoder IC. That is, when a button is pressed the pin corresponding to that button goes low. Normally, each of the 14 output pins is high. It is up to the user to use this information in their own circuit where remote control is required. For example, to control up to 14 relays or to control the movement of a robot. We supply all the necessary extra components required for the decoder IC to function properly. No PCB is supplied. It is up to the user to breadboard their application then make their own PCB. A sample application/test circuit is provided. A 330W resistor & LED are supplied for testing the active low on a pin in response to a button press.

We supply three sets of components:
1. a 14 button Infra Red Remote Control unit. It just needs you to add 2 x AAA batteries.
2. a 3-pin Infrared Receiver Module, the Waitrony PIC1018SCL, which converts the modulated 38kHz signal into data pulses. 3. an Atmel 89C2051-24PC microcontroller which we have preprogrammed to decode the IR data pulses from the remote control into one of 14 active low outputs. All required components for the microcontroller are supplied - a 12MHz ceramic resonator for the oscillator, resistor, capacitor and diode for the power-on reset circuit plus two 10K pullup resistors

Kit 93 PC Data Acquisition Unit

Use the parallel port of your PC as a real world interface. It enables your PC to both monitor & control external events and devices. The world is a mixed analog & digital world. With the appropriate sensors the PC can monitor physical variables such as pressure, temperature, light intensity, weight, switch state, movement, relays, etc, process the information and then use the result to control physical devices such as motors, sirens, other relays, servo motors (up to 11) & two stepper motors

May 2004 - Revised software for Kit 93. Works with W9x/ME/2000/XP.

Picture of PCB

Hardware Features
* Eight digital Outputs. Open collector, 500mA, 33V max.
* Sixteen Digital Inputs. 20V max. Protection 1K in series, 5.1V zener to ground.
* Eleven Analog Inputs. 0-5V, 10 bit (5mV/step.)
* One Analog Output. 0.2.5V or 0-10V. 8 bit (20mV/step.)
* Small plastic box (140mm x 110mm x 35mm) with screen printed front & rear panels supplied.
* Connected to the PC by a 25 pin straight through cable.
* Software utilities & programming examples supplied.
* Seven pages of documentation plus schematic. Requires heatsink (supplied.)

Kit 94 Digital Rotary Control of a Unipolar Stepper Motor

Picture of PCB Kit 94 source code 2K

ecw1j.pdf Kit 94 Bourn Grey Switch encoder Data Sheet

This kit uses a Grey switch aka bit switch, to single step a unipolar stepper motor in either direction. Uses a PIC 16C54 plus UCN5804 stepper driver IC. PCB is 4 in square, single sided

Kit 95 50 MHz Frequency Meter

Kit 97v2

2 Watt Amplifier Module using the LM380. The IC solders directly to the PCB so no heatsink is required

Kit 98 Preamplifier

Picture of PCB

General preamplifier. It has a gain greater than 40dB which is enough for most applications. It can also take input from an electret microphone by adding one extra resistor (supplied in the kit)

Kit 100 Stereo Preamplifier - Tone Control Unit

Kit 101 20MHz Function Generator

Uses MAX038. Comes in its own box with front & rear panel pieces. Coarse & fine tuning. Also TTL output. 2V p-p. Full instructions. Three links are needed on the single-sided PCB. It used to be 5 links (as seen in the photo) but we managed to reduce it to three for the last PCB production

Picture of PCB

Picture of end panel pieces provided.

EL2001 data sheet

MAX038 Data Sheet

Kit 102 Four servo Motor driver

Picture of PCB

Using a PIC 16C71, a crystal, 8 resistors & 4 capacitors this kit will independently control up to 4 servo motors. We do not supply the potentiometers or servo motors. (We used a Futaba FP-S148 for out tests.) 5V DC power supply required. Full instructions provided

Kit 103 Christmas Tree

C source code

As published in 11/99 Silicon Chip, Australia

Kit 104 Music Box Engine

Picture of PCB

M3481, M3485 IC Specification

The electronic equivalent of a mechanical music box. It is activated by light falling on an LDR. It then plays a range of tunes. The kit can be placed anywhere you want to hear a tune when light shines on it; opening a cupboard or drawer, music box

Kit 105 18W BTL Audio Power Amplifier Module

Uses HA13118

Kit 106 50W Hi-Fi Audio Power Amplifier with Mute & Standby

TDA7294 $36 total all inclusive price

Kit 107 Low Voltage 1W Stereo Amplifier Module

TDA7053 data sheet

Stereo version of Kit 27. TDA7053. Note there is NO suffix. This is very important

Kit 108 Serial Isolated I/O Module. 8-Relay Module (mains rated - to 250VAC)

Picture of PCB

An extension of our Kit 74, PC controlled 8-Relay Board with safe & protected 250V switching relays and added features. It is in a plastic case, latched relay operation, 250V/12A certified relays switched by using Dinkle connectors (250V rated), and with 4 external inputs. Comes with case and end panel pieces as shown in the photos. Uses serial port so it can be located over 100 yards from the PC. After programming the PC can be disconnected from the PC without affecting the state of the relays. However, the kit is not programmable in itself. It requires an external controller such as a PC to send it commands to control the relays and monitor the inputs.

Latest Windows software available from here

New Windows control software for K108 - Serial I/O board here
The K108 Controller Pro software provides a more graphical user interface. It's designed to provide general purpose control and monitoring functions for the K108. Note that it is not intended to be an exact replacement for the software supplied with the K108. Freeware

'Lite' version also available here

Dual Kit 108

Kit 108 has been a good seller so we have connected two together to give 6 Inputs and 16 Relay Outputs. All you have to do is change the firmware, change the front & back panels, and jumper out 2 ICs

Get new Windows software zip/

Kit 109 Unipolar Stepper Motor Driver Kit

Picture of PCB

UCN5804B data sheet

Drives any 5, 6 or 8 lead unipolar stepper motor. Based on the UCN5804 IC. All features of this IC (direction, on/off, pins 9 & 10) are brought out to SPDT PCB-mounted switches. Pulses from a 555 setup as an astable oscillator are used to rough position the motor. Switch to manual single-step mode for final positioning using a tact switch. 4 LED's give visual indication that step has been made. Three run modes supported. Full explanation

Kit 110 Continuity Tester

Picture of PCB

A continuity tester is one of the most useful pieces of test equipment to have. It is used for testing the electrical continuity between two points. Our tester will "buzz" up to a specified resistance or less. Two on-board resistance ranges available. Full theory of operation given. The user may adjust the resistance ranges to suit his own requirement

Kit 111 Square Wave Oscillator

Picture of PCB

Simple circuit to generate square waves of approximately 1Hz 10Hz 100Hz 1KHz 10KHz & 100KHz

Kit 112 Pocket Data Logger/Sampler

Picture of PCB

Picture of end-case piece

Revised software for Kit 118, Kit 112 and Kit 93. Works with W9x/ME/2000/XP.

Connects to the PC parallel port & will sample 0-2V or 0-20V at intervals from 1/hour to every 100uS. Copied (with permission) from Electronics Australia 8/96. PCB redesigned with PCB-mounted switches to be ALL CONTAINED IN AN EXTENDED D-SHELL CASE. No batteries needed

Kit 113

Picture of PCB

ZTX1053A Data Sheet

March 14, 2005. Kits 113 158 179. Peter Simmonds has developed a visual basic program with source code which can interface a PC running windows to the stepper motor kits K113, K158 and K179 via the parallel port. It uses a high speed timer component RSTimer. Both the source code and RSTimer are available for free at here

Two Stepper Motors Driven from a PC. Connects to the PC parallel port & will drive two stepper motors up to max. 3A each. All contained in an RS232, extended D-shell case. Software will accept 4 inputs from external switches. Software will also single step motors. Three run modes supported. All components supplied except the stepper motors

Kit 114 Dual Unregulated Power Supply

Picture of PCB

Four on-board 100V, 3A diodes plus 2200uF/50V electrolytics to provide an unregulated power supply from a center-tapped transformer

Kit 115 1W Stereo Amplifier.

- Version 2 9/2004

Uses 2 LM386N-1 for a stereo amplifier. Ideal for Walkman and other battery powered items. 4V - 12V DC.

Kit 116 Alarm Siren Driver.

Driver circuit for 8 ohm horn speakers. Based on the Zetex ZSD100 siren driver IC. 4V - 18V. 120dB of sound. $13 plus postage.

Kit 118 12-bit Data Acquisition System

April 2002. Revised software for Kit 118, Kit 112 and Kit 93. Works with W9x/ME/2000/XP.

Linux software for K118 has been writen by James Cameron. You may get it at Quozl's Open Source Work

It uses a MAX186 ADC. It all fits inside an extended D shell case which plugs onto the parallel DB25 connector of your PC. It has 8 analog inputs, 4 digital inputs & 4 digital outputs

Kit 120 Dual Temperature Meter

Uses LM34 or LM35 with a commercially available C&C LCD module

Kit 123



Kit 124 & Kit 125

Kit 124

Picture of PCB

Kit 125

Compact positive (K124) and negative (K125) adjustable power supply +/- 1.5V to 35V depending on input power source. On-board heatsink

Kit 126 Mini-VOX and Relay

Kit 127 3 1/2 Digit Panel Meter

LCD data sheet VI302-DP-RC

A double-sided board designed to eventually replace Kits 2 and 34

Kit 129 4 Digit Up / Down Counter using an Atmel micro-controller

This kit was reviewed in Silicon Chip, April 2001. Kit 129 and k154. Microcontroller-Based 4-Digit Counter Modules

Open collector output is used in k129 and k154. For a discussion of open-collector output get this text file

The first in a series of counters using uC's. This kits clearly shows how uC can more than replace a host of ordinary logic IC's. This is a single-sided PCB. It will replace the old Kit 1. It will do much more than Kit 1 for about the same price. Several versions of the software have been made in response to special customer requests. If you want these or similar small changes in the software for no extra cost contact us.
K129-5: Counts by 5
K129-5U: Same as "K129-5" except display is upside down
K129ND: Count up only, no debounce, display on/off via "Down" input

Kit 130 Infra Red Barrier/Door Minder

The plastic tube is to put over the IR LED to restrict beam divergence. This is needed to prevent false triggering when the barrier is only a few yards wide

12/2001. We have a new version of this kit. It is a new Transmitter circuit. The original transmitter circuit had excessive frequency drift with supply voltage. Although it still worked we were not happy with it and this new version used 2 x nmos 555 chips which oscillate independent of the supply voltage

Waitrony IR Receiver/decodermodule - General purpose. Not noise protected

Kit 134 Introduction to LCD's

Software for Kit 134

JPGs for assembly

DS1620 data sheet

This kit was published in Silicon Chip, 12/2000. Here is a copy of the article. Kit 134. Introduction to LCDs. 12/2000

Learn how to connect a 2x16 LCD to a PC parallel port. First this kit will show you how to write keystrokes from the PC keyboard to display on the LCD. It will show you how to process this data (rotate the string left and right.) All the code is provided. Second, there is an on-board DS1620 to measure temperature. The temperature is displayed in F or C. Just press a button to display either. With the DS1620 you may set breakpoints to turn a thermostat on/off. We provide all the code to do this. Once the DS1620 is programmed it may be removed and placed in another device for temperature control. Many web references are given

Windows software for K134 - Introduction to LCDs
Windows software combining both LCD and DS1620 control in the one application. Screenshot Download