The British Caving Association

Hi, my name is Roberto and I´m from Spain. I have Friends who likes speleolgy and how I know something about communications they ask me If I would be able to build a radio. I´ve read about heyphone and I would like build a pair of them, thanks to CREG, in particullary Jhon Hey (RIP). Nevertheless I´...

Hi, my name is Roberto and l´m from Spain. I´m interested in build two heyphones. Is possible buy any pcb´s yet?

I know this is a old topic but.........

Thanks in advance.