Hi all,
I've a question about the connections for keying my linear. I understand the concept of open collector, it's limitations (current, voltage breakdown etc.) and have used this approach to switch my linear before. However, the protection diode thing is confusing me. Usually I would connect a diode across the relay coil to prevent back emf problems when de-energisjng the relay coil. So what does the "connect the protection diode to the relay positive supply" comment mean? I don't want to hack my linear open to get to the relay +ve supply. It may be me but don't think the manual is clear on how to establish the interface. Am I better off using an external opto isolator or do I just connect everything up assuming the relay in the linear doesn't draw too much current (switches OK with my K2) Cheers, Paul M1PAF
