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How to Make Electrical Timers
by Fletch
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02/27/88
Dripping Tap Timer
This type of timer is made for a sink/faucet of some sort, where you
can control the rate of water dripping out of the nozzle. The most convenient
way of doing this is to place the whole thing in the sink, but the charge
(bomb) can be placed elsewhere, depending on how much wire you have. What
you're gonna have to do is get a glass jar (or any other non-conducting
container), size doesn't matter (depending on how much time you need). Hook
two wires to aluminum foil (Steel wool may also be used), placing the strips of
aluminum over the mouth of the jar. Connect one wire directly to the
detonator. Connect the second wire directly to the battery. Run a third wire
from the battery directly to the detonator. Now place the glass jar under the
dripping tap (if not already placed), and turn faucet on (adjust the rate
according to how much time you need). When the water level in the jar reaches
the aluminum foil contacts, the electrical circuit is closed, thus detonating
the bomb.
Relay Timer
This type of timer is best used when long delays are required. You
will need two batteries (A & B respectively). Hook battery A to a relay.
Battery A gives the power to the relay's electromagnet. When battery A fails,
the circuit running through the relay closes. Battery B is hooked so that when
the relay closes, it fires the charge. Experiment with various batteries till
you find the best type of battery to use for the desired delay.
Hourglass Timer
What you're gonna have to do is take out all the sand in the hourglass,
replacing it with metal filings. Now make two small holes into one end of the
hourglass. Hook one wire from the battery directly to the detonator. Hook a
wire from the detonator to the top hole in the hourglass, and hook the last
wire from the battery to the bottom of the hourglass. The metal filings
flowing into the bottom of the hourglass will close the electrical circuit and
detonate the bomb.
Thermometer Timer
Make a small hole in the bulb of the thermometer, inserting the first
wire from the battery directly into the bulb. Next make a hole into the stem
of the thermometer (Making sure it's above the mercury level). Insert the
second wire directly from the detonator to the stem. Insert the third wire
from the battery to the detonator. When the thermometer is exposed to heat,
the mercury will rise and close the electrical circuit, detonating the bomb.
Delay time can be adjusted by varying the intensity of the heat source and the
thermometer's proximity to it.
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