Step 5Add the battery holder an the switch
Solder the black wire of the battery holder to the lead of the capacitor that is the closest to the grey stripe.
Solder a piece of wire to the other lead of the capacitor.
Then solder the push-button switch to the red wire of the battery holder and the other wire.
Also, the battery holder you just added, that is where you put the dead Ni-Cad battery to zap them.
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