!!! SURF PI PRO negative voltage issue

[domoha]

Hello guys I m building the surf pi pro and when i connect the negative (-5v) voltage to the OPAMP NE5534, it drops to 0.5 V. Can someone help? Cheers

[chiuino]

Hi there!!
Before writing I checked several posts on the forum but no one has been a real help to know what is wrong with the kit I bought on site silverdog! I state that I do not have an oscilloscope but doing tests with an AM radio I hear the sound produced by the coil. The problem is that I...