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Basic circuit with relay

Former Member

Hi.

First of all: I hope this is the place to post.

 

I am gonna make an easy circuit with a relay to control a pump.(see attachment)

I understand the principal, but I wonder if there is anything more I gotto think of, like resistors or something?

 

It is not to be used in a car.

 

I am thinking of using an car relay: 12V, Max 30 amp.

The pump use 12V and 4 amp.

The fuse need to be 4 amp?

 

Can the switch for example be wired directly to pluss and minus on the car battery or do I need a  resistor there?

Thanks!

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    Boy, brain fart!  (It was me)  Somehow, it got into the back of my cabasa that those signal diodes of yore could handle an ampere, wrongo! 200mA, 300mA are the types of numbers I am seeing.  Anyway, you want an HVish diode that has low capacitance.  Let me step back from discussion of specific p#s to one point about circuits that switch reactors.  Charged, in the case of capacitors, they initially max out at the potential ya' left 'em at.  Inductors at the current you inserted.  This is a point of analytic simplicity, in what can look like a spaghetti bowl (all metaphors turn to food at a certain hour) of equations. 

     

    Sorry, I should have looked that up before I posted.  Didn't realize I didn't know what I didn't know.  In the many places where they are applicable the 1N4XXX diodes are an excellent value and quite robust.  I certainly keep a drawer-full that I replenish often.  Reliable, cheap, and easy to find a DS for, something I must train myself to do more often.  Parts are generally much better now than when I became accustomed to them.

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  • 0

    Boy, brain fart!  (It was me)  Somehow, it got into the back of my cabasa that those signal diodes of yore could handle an ampere, wrongo! 200mA, 300mA are the types of numbers I am seeing.  Anyway, you want an HVish diode that has low capacitance.  Let me step back from discussion of specific p#s to one point about circuits that switch reactors.  Charged, in the case of capacitors, they initially max out at the potential ya' left 'em at.  Inductors at the current you inserted.  This is a point of analytic simplicity, in what can look like a spaghetti bowl (all metaphors turn to food at a certain hour) of equations. 

     

    Sorry, I should have looked that up before I posted.  Didn't realize I didn't know what I didn't know.  In the many places where they are applicable the 1N4XXX diodes are an excellent value and quite robust.  I certainly keep a drawer-full that I replenish often.  Reliable, cheap, and easy to find a DS for, something I must train myself to do more often.  Parts are generally much better now than when I became accustomed to them.

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