K Kieron88 New member Jan 17, 2021 #1 Hi. I just got the HAARP PCB and I was unsure what these 4 holes are for? Attachments F9F72728-18EF-4041-8F77-50A26E5E7CA6.jpeg 890.4 KB · Views: 8
H HamishR Well-known member Jan 17, 2021 #2 The + and - are where you connect the power supply socket. The other two are usually grounds for the input and output sockets. Just check they connect to known ground points on the PCB but that's usually what they would be.
The + and - are where you connect the power supply socket. The other two are usually grounds for the input and output sockets. Just check they connect to known ground points on the PCB but that's usually what they would be.
