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6 votes
2 answers
356 views

Switching on an SSR on positive voltage and turn it off on negative voltage

I am currently trying to "hack" my way through a door lock, whose PCB cannot be changed. The task is to replace the motor for turning the cylinder with a Solid State Relay. However, the only ...
Sofia Braun's user avatar
-1 votes
1 answer
953 views

Close/Open circuit based on power supply to a relay [closed]

I am new here and to electrical world. I need to resolve a very basic real life issue. I have two fans in my bed room. One is AC and the other one DC powered by a lead acid battery. I want the DC fan ...
Sikander's user avatar
  • 109
0 votes
1 answer
394 views

How to stop two DC motors simultaneously using limit switches

I need some help - I'm building a machine but I'm not sure of the best way of doing it. Thanks a million for your help Just to refresh my point - I've made one or two changes I have two large wire ...
Golden Bucky's user avatar