There is plenty of information about this type of device on the internet so I won't repeat it here.
This page is just to provide a simple stripboard layout for making a zapper.
The cathode (short leg) on the LED is at the top (negative).
The 555 timer device should be in an 8 pin DIL socket
Capacitors are ceramic disc type
4.7nF = .0047uF and 10nF = .01uF
Do not forget to break the copper tracks between contacts of the 555
All parts available from www.maplin.co.uk and many other suppliers.
8 pin DIL socket for 555 timer
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