- Joined Mar 19, 2015
I am converting the aforementioned PCB into a circuit. The relays are marked "RL" and highlighted by corresponding colors: yellow for the contacts and coil of the relay 2, for example. Connectors are represented by open circuits. However, I don't understand how the circuit circled by the red circle works.
To my sense, it is a transient protection system, since it got TVS diodes (KE150CA). However, why do we need D5, since it will make the whole protection system work in only one direction? Also, I don't get the idea of using C5 here too.
Should you provide resources for my further studying, I would be appreciated.