http://zappers.narod.ru

We saw a lot of discussions about which zapper to buy, which one is superior to another, etc. What we start to forget is, that all the zappers are inherited (even not as a schematic) from Clark's original and that zapper was supposed to be DIY device.
For many people buying a zapper is the only option, but for some DIY enthusiasts building a zapper could be more interesting than using it.
Here I found a collection of good designs of zappers:

http://zappers.narod.ru

Enjoy :)