Light & Laser
K8 - Light Alarm Price Photo Docs
Detects very small amounts of light and sounds the piezo alarm. Put it in your cash box or cupboard. Uses Darlington photo transistor MEL12 and 14011 IC. Educational kit.

K12 - Audio-To-Light Modulator Price Photo Docs
Introduces the Optocoupler-triac MOC3010 and triac. Complete electrical isolation between input audio signal (low voltage circuit) and output light modulation (mains supply voltage levels) is achieved.

K37M - 5 LED Multi Sequence Flasher Price
5 ultra bright LEDs flash in seven patterns. Cycle through the patterns using pushbutton switch. When you find the pattern you want operate the toggle switch to keep it flashing so long as power is applied to the board. 3V operation. Chip-On-Board PCB. Motherboard supplied to mount all components.

K52M - 5 LED Random Sequence Flasher Price Photo Docs
Very small Chip-On-Board PCB just 15mm x 8mm. 3V supply. 5 LEDs flash in sequence. Push-on switch toggles the flashing sequence on. A second push is required to turn the flashing sequence off. Ideal for model railways. Tape up two 1.5V button cells with the PCB. Spare COB PCB supplied. Good introduction to the electronics in today's toys and games. Motherboard supplied to mount all components.

K79C - Light/Dark Relay Switch PricePhoto
This is a basic relay switch which is triggered by either falling or rising light levels. Uses a schmitt trigger to avoid relay "chatter" at the trigger point. A PCB-mounted switch converts the circuit from light to dark switching and vice versa. A small trimpot adjusts the light level. The trimpot does not need readjusting when the light/dark switch is moved. (LDR datasheet)

K130 - IR Light Fence/Door Minder Price Photo Docs
Set up an invisible infra-red light beam to monitor doorways or any other area. When the beam is broken a relay (maims rated) is tripped which can be used to sound a bell or alarm. Ideal for customers entering a shop, cars coming up a driveway, etc. Separate transmitter and receiver boards. Transmitter can be powered from receiver board (extra plugs supplied). Uses modulated 38KHz carrier signal. 9-12VDC operation. IR LED and Sensor datasheets.

K169 - Versatile PIC Flasher PricePhoto Docs
Enhance your Christmas decorations or simply brighten your childrens' bedroom ceiling with this versatile PIC-powered flasher display. Creates a number of different effects and powers up to eight channels of LEDs or miniature low voltage filament bulbs. Can be added to almost any Christmas decoration or make your own design. Safe low voltage operation from a suitable mains adaptor.

This kit can be used to flash from 1 to 176 LEDs. The kit is supplied with 8 superbright red LEDs and 8 green LEDs. The LEDs can be arranged in any pattern as required. The board produces a random pattern and uses an onboard DIP switch to select speed (fast, medium fast, medium slow, slow), modulation (100%, 50%, 25%, 12.5%) and profile (smooth, flash).

This kit is based on the Versatile PIC Flasher by Steve Challinor, EPE Magazine, December 2002. The design has been modifed to use a 2803A driver chip instead of all the transistor/resistor combinations in the original. This not only allows for quicker and easier construction but even more LEDs than the original circuit. The PIC source code and HEX file is available here (ZIP file).

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