I’m looking for any information about trigger (books, sites, pictures).

I have made this trigger some time ago, it’s from Ragnar's Homemade Detonators:

http://www.angelfire.com/oz/garbagelive/trip/20.jpg


http://www.angelfire.com/oz/garbagelive/trip/trip.htm

You can use a clothes peg with two drawing pins for electrical trips. Just put something non-conductive between them, and have the wire pull it out.

Electrical systems are very much easier to set up than mechnical ones, but harder to make in the first place.

It works well but I have used an aluminum foil for electrical tips, a piece of thin can could work too

http://www.angelfire.com/oz/garbagelive/trip/d1.jpg


I prefer mechanical systems because I don’t understand too much about electrical systems.

This might sound a bit lame, but you know those throw-down snaps? The little paper wrapped ones?

Place a load of them in the way, and you will hear people coming.

Does anyone know what the explosive in those is?

As for mechanical systems, there are quite a lot. NBK2000 talks about "toe poppers" elsewhere, which is where you modify a bullet with a BB glued to the primer, put it in a tube in the ground, so when trodden on, it fires the cartridge.

You can make pnuematic or hydraulic ones, too, using the weight on a mat or balloon to push a contact shut or even hit a primer.

The hand grenade in a tin can is quite an old one, but use a short fused grenade, or the tripper will have time to run.

Any spring or bungee can be used to smack a primer.

In the UK, you can buy alarm mines, which are 12g carts set off by a strong tripwire. Generally, blanks are used.

I think that these poppers are made with a small part of silver fulminate and other part with sand. The sand is used to give friction.

Jacks Complete, NBK's toe poppers didn't operate by firing a cartridge, IIRC they were a small bag that contained a sensitive primary (such as AP or HMTD) and some fine gravel to cause friction.

They are kept wet with a volatile solvent (any solvent, but it has to evaporate quickly and mustn't dissolve the explosive), then they are placed and dry out after placement. Once they are dry, they will go off when stepped on.

Read NBK's pdf for the exact details.

I tried to make the first trigger, but I had some problems with the second wire: when you put the cork in the pipe the second wire gets out of its position; that part of the wire that should stay in the top of the nail just displaces itself.

I think you can solve this problem with another nail, roll the second wire on it and stick it in the cork as the other nail, such that the wire will stay firm inside the cork.

I had the same problem and I was thinking to do some thing with this wire, your idea was very nice, here is it:

http://www.angelfire.com/oz/thegarbage/trip/1.jpg

http://www.angelfire.com/oz/thegarbage/trip/2.jpg

http://www.angelfire.com/oz/thegarbage/trip/d2.jpg

Just a thought. That hanging wire worries me. I'd use two small nails of equal length and have just the heads protruding from the cork. When the spring powered nail touches both, the circuit is complete. The clothespin is a lot easier, though not as elegant.

Why don't you go for this
------------------------------------------------plastic pipe
--------------------------------------
Metal strip +
--------------------------------------
plastic strip ..........................|----------------------trip wire
-------------------------------------
metal strip -
-------------------------------------
-------------------------------------------------------plastic pipe
both metal strips are bound with rubber to each other and plastic strip is in beteween them.The trip wire is attached to plastic strip,so when pulled it will take the plastic strip out and hence making contect between metal strips.
You can control the required force(to some extent not of the order of 10s of kgs) by the tighting hard the metal strips.
The drawing is crude but I think it will give you the basic idea.

Charlie Workman:

That hanging wire is necessary to facilitate the contact. Some times when I use two small nails of equal length as you sad, the big nail touches just one small nail and don’t complete the circuit. To solve this problem I have made this hanging wire, with it every time that you pull the trigger the wire touch the nail and complete the circuit.



Thrall:

Your trigger is very good. In the Vietnam war, Vietcongs have use similar systems with Bamboo.

I'd attach the "hanging" wire to the head of the (top) spring-loaded nail. Flexible wire shouldn't stop the spring-loaded nail from moving all the way down.

I think that it really works. Soon I will test it…