Since the input +ve voltage will be shared by controller * circuit & output pin, then input has enough ampere to satisfy the load. Then why not just c onnect input directly to the load ? This will save the ampere used by the * i.e. less heat ( esp for hot climate ) & more amps for e.g. spark plugs / starter motor, less cost & weight too.
3 pin relays seem useless, am I right ?
Feb 04, 2016
5 Replies
Show us a circuit so we might get a glimmer of what you are on about !!
Google usenet does not let me post any diagram. Now in Msia, no ISP has a nntp server. Youtube has a video ( listed by Yahoo, when I searched for 3 pin relay )with diagrams of 5, 4 & 3 pin relays.
The wiring for any controlling switch, and the switch itself, will have to be rated for the load current if you don't use a relay. More copper, size and safety risk for these parts.
There''s Dropbox for one. What do you mean by "3 pin"??
If you think of the relay like a transistor in "emitter follower" it makes perfect sense.
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