1. ASSEMBLING THE PCB – V3.914 Hold the PCB as shown below

2. WIRE LINKS There are 2 wire links to put in – LK1 and LK2. Use tinned copper wire (0.6mm 2 ) and shape it so the wire is as flat as possible to the PCB.

3. BATTERY HOLDER The battery holder is for the button cell. It has 2 tabs top and bottom that insert through the large holes. Solder these carefully and use plenty of solder.

4. RESISTORS There are 2 resistors, R1 and R2. Insert them as shown and cut off the excess wires with side cutters. When the resistors are inserted into the PCB, bend the wires outwards slightly, to hold them in place while you solder them.

5. IC HOLDER This is optional but eases replacement of the IC if needed. The IC holder is inserted with the notch facing down. Make sure all 8 pins go cleanly through the holes. When the IC holder is inserted into the PCB, bend the pins over from 2 opposite corners to hold the IC holder in place while you solder it.

6. CAPACITOR The capacitor C1, is a 1uF capacitor labelled “105”. It can be inserted either way round.

7. TRANSDUCER The transducer is an AC type. It can be inserted either way round.

8. PUSH BUTTON The push button has a flat edge on the cover. This should be inserted facing left as shown. Ensure it is pushed fully into the PCB.

9. LEDS There are 4 red LEDs. These have a positive connection denoted by the longer wire. There is also a flat section on the edge showing the negative, this faces upwards. Use the LED guide to set the LEDs to the correct height. This is the same height as the rim of the push button, 6.5mm.

10. INTEGRATED CIRCUIT The IC can now be inserted into the IC holder. Make sure the notch on the case of the IC is facing down and all the pins are inserted correctly. To ease IC insertion, carefully pinch the rows of legs inwards slightly to help align them. ICs generally have their legs set slightly apart from manufacture.

11. BUTTON CELL Finally insert the button cell with the flat side upper most. The LEDs should flash and a brief tune should play – then the IC will go to sleep. Push the button to operate.