I have now spent quite some time trying to figure out where this is going wrong, so I though I’d ask you smart people before I burn another core.
I have the following setup, where I am trying to power my core from a 15V DC source. The problem is that when I measure the voltage between Vin and ground on my core, it is 5V DC and 10V AC and I am at a loss as to why. The problem only occurs with the core as far a I can see, but as I have tried with another core too (the one that burned), I don’t think it is the problem. I have also tried with several different L7805 for IC1, all with the same result. Has anyone else had the same problem?
IC1= L7805CV, C1=330nF, C2=100nF