There is a 4.7uF (electrolytic?) capacitor that when a key is pressed should charge up and hold the voltage high for a period of time untill it discharges at pin 11, so while it is high the rest of the unlocking code can be inputed. The problem is as soon as i release the key the voltage goes low - i think the capacitor isn't charging or im not using the correct one?? im using a 4.7uF electrolytic capacitor at 63V the circuit is running from a 5 volt supply.