Epee Hit Detector

A simple passive electronic hit detctor for an electric Epee. More info in the Instructions.
The one pictured has no electronics in it, but my fencing coach has the working ones.

DEC 2018: Updated with correction to the instructions (there should not be 2 buzzer (-) legs) and an updated file (_NFC) with a holder and rearranged letters. I built a couple for Newbury Fencing Club so spotted the error in the instructions. If you are in Berkshire in the UK on a Monday night why not visit us (see newburyfencingclub.co.uk for details).