If you're like me, you probably love tinkering with electronics and getting your hands dirty. But sometimes the technical jargon and confusing wiring diagrams can leave us feeling intimidated and frustrated. That's why I'm here to break it down and explain it in a way that even us non-electricians can understand.
How to Wire a Relay
Relays can be a little tricky to wire up, but once you get the hang of it, they can be incredibly useful for controlling all sorts of electronic devices. The basic idea behind a relay is that it allows you to use a small electrical signal to control a much larger one.
For example, let's say you have a set of lights that you want to turn on and off using a switch. If you were to wire the lights directly to the switch, you would have to run heavy-gauge wire to handle the load. But if you wire a relay in between the switch and the lights, you can use a much smaller wire to control the relay, and the relay can handle the heavy load of the lights.
So how do you wire up a relay? The basic wiring diagram for a relay looks something like this:
As you can see, there are four connections on a standard relay: the control circuit (pins 85 and 86), the normally open contact (pin 87), and the normally closed contact (pin 87a). The control circuit is the part that you wire up to your switch or other controlling device, and it's what sends the electrical signal to the relay to tell it to turn on or off.
The contacts are what actually control the load. The normally open contact (pin 87) is the one that connects to the load when the relay is activated, and the normally closed contact (pin 87a) is the one that's connected when the relay is not activated.
12s Meter Wiring Diagram
Another useful wiring diagram is for a 12s meter. This diagram shows you how to wire up a DPDT (double-pole, double-throw) relay to control a 12s meter. The DPDT relay is used to switch between two different power sources, in this case the battery and the alternator.
The basic idea behind a 12s meter is that it allows you to monitor the charge status of your auxiliary battery while you're driving. This is useful for anyone who has a camper or other vehicle with a second battery that's used to power accessories like lights, a fridge, or a sound system.
To wire up a 12s meter, you'll need a few things:
- A 12s socket - this is the socket that the plug from your caravan or trailer will connect to
- A 12s plug - this is the plug that will connect to your vehicle's 12s socket
- A DPDT relay - this is the relay that will control the switching between the battery and the alternator
- A 12s meter - this is the device that will display the charge status of your auxiliary battery
Once you have all of these things, you can wire up your 12s meter using the diagram above. It might take a little bit of trial and error to get everything working correctly, but once you do, you'll have a handy tool for monitoring the charge status of your auxiliary battery.
So there you have it - two useful wiring diagrams that can help you get started with controlling electronic devices using relays. With a little bit of practice and some patience, you'll be wiring up all sorts of cool gadgets in no time!
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