Perforated strips eliminated soldering

[Esteban]

In 1929:

http://blog.modernmechanix.com/2010/...ate-soldering/

[Tekeweke]

detectors

Hello my name is Esteban from Argentina I'm also you speak Spanish and I am trying to make the detector Bandit II am the electronics hobbyists and gary make the simple coil and it works pretty well but now I want something that discriminates greetings
PD put it here because your mailbox is full sorry