Electronic timers are utilized in many applications. From appliances, to alarms, our lives are completely intertwined with digital timers. In makeshift circumstances, an electronic timer is an invaluable tool for automating tasks. The most common use in wartime is allowing a fighter time to escape from the scene where an explosive device may be planted – and initiated after a set amount of time.
The following documents detail how timers can be built out of gadgets and components “lying around”. The most obvious is by simply using an analog clock, with tinfoil, insulated on the inside, wrapped around the hour hand or the minute hand, depending on the amount of time required. A peg is soldered onto the clock face (or attached by some other means) with tinfoil on it. When the hand touches the peg the tinfoil completes the circuit – initiating what ever you wish.
TIMERS: ““Timers for explosives are much more readily availible now than several years ago. The watch companies have seen to this To make a simple timing device all you need is any digital watch with alarm and some wire. Digital watches with alarms are the perfect timer for a bomb. They can be modified very easily. To do this,simply open the watch and disconect the buzzer. Solder some wires to the buzzer leads and you are all set. This devise must be conected to a primer.
This is actually two separate circuit plans – #1 – a timer which triggers a relay, and #2 – the relay controlled ignition circuit. After looking at the schematic, you may wonder what the point of the relay circuit is – why not just put the igniter in place of the relay coil on circuit [...]