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Message
Simple diode question in a circuit
Posted on 9/13/16 at 8:46 pm
Posted on 9/13/16 at 8:46 pm
I want to make a circuit where a action happens when given an input by a relay. I would also like the same action to happen by a switch press without back powering the circuit.
A 10a 12VDC circuit.
Would just using a simple 10 amp diode on the leg from the switch to the circuit not allow power to flow back through the circuit?
It's a reverse camera that comes on when the reverse light energizes it's relay. I would also like to turn on the relay from a switch without the reverse lights coming on.
I have a hitch camera, and a high mount reverse camera. In reverse the radio gets the hitch camera and the parking lines appear on the rearview monitor. So I have two reverse screens in drive, the rearview monitor gets the rear image and the radio goes back to being a radio but when parking I would like to be able to leave the cameras on.
A 10a 12VDC circuit.
Would just using a simple 10 amp diode on the leg from the switch to the circuit not allow power to flow back through the circuit?
It's a reverse camera that comes on when the reverse light energizes it's relay. I would also like to turn on the relay from a switch without the reverse lights coming on.
I have a hitch camera, and a high mount reverse camera. In reverse the radio gets the hitch camera and the parking lines appear on the rearview monitor. So I have two reverse screens in drive, the rearview monitor gets the rear image and the radio goes back to being a radio but when parking I would like to be able to leave the cameras on.
3
Posted on 9/13/16 at 9:43 pm to Napoleon
The relay would prevent back flow. If it's open no power can go across it. Same with the switch if it's open.
Would there ever be a case where the relay is closed with no power on its common? If so then you'd put the diode from the NO leg of the relay.
Would there ever be a case where the relay is closed with no power on its common? If so then you'd put the diode from the NO leg of the relay.
Posted on 9/13/16 at 9:51 pm to Napoleon
A graphical representation of the circuit would help. Depending on how I read the description, you may not need a diode, as you first response pointed out, if the relay you are talking about powers the camera alone.
Posted on 9/14/16 at 2:21 am to Napoleon
Put the cameras on a SPDT switch. I have aftermarket backup lights I run off of one
Battery hot
Off
Reverse On
Battery hot
Off
Reverse On
This post was edited on 9/14/16 at 2:24 am
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