Questions about relays

I am building a robot with a specific purpose and I have hit a snag. My remote controls on the receiver end are 4.5v and the motors I want to run are 12v all of it is DC. The relays I have don't pull in a 4.5v so I need another way to doing this. I either need another way of pulling in the relays; I need relays that pull in at 4.5, or some other intelligent solution that I cannot think of. Please help!

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NachoMahma8 years ago
. I'd go with 4½V relays. Make sure they will handle the current of starting the motors.
kendallickes (author)  NachoMahma8 years ago
one problem is that i cannot find 4.5v relays and im not sure how to tell if they can handle starting the motors. will these work?
. Maybe. "Contact rating: 30VDC 1A." How much current does your motor pull?
kendallickes (author)  NachoMahma8 years ago
Well the funny thing is i'm using the little rely to pull in a bigger relay 9v to 12v. I’m a noob for sure but I know that the relays I have will work with my motors because I have tested that part. The relays I have are standard in most Nissans. There is probably a better way of doing this but until I figure it out, I just want to make it work.
if you describe better what you are doing (maybe with images) we may help more
kendallickes (author)  110100101108 years ago
ok will do but i need a day or so to get that stuff together, thanks a bunch guys
kendallickes (author)  kendallickes8 years ago
ok I have a 4.5v bat I need it to switch a relay to run a 12v circuit.

my components are

1 - 4.5v 600mAh Battery (runs my RF controls)

several - Relays

2 - 12v motors (no other information)

1 - 12v (13.6v) 1.4A Battery to run my motors

My major problem is that my relays pull in around 6-9v

I have ordered some 4.5v relays to be intermittent between the 4.5v batt and the other relays, this should fix my problem but its not ‘smooth’ I am also starting to build my own small circuit boards so if you guys know a way I can make this work well let me know and I’ll do it.

I order parts from here:

I am making some drawings for you guys to look at as well.

Thanks a bunch for the help!
your plan (4.5 V relays - 12 V relays - motors) is ok and can work you can use 5 - 6 V relays instead of 4.5 V if they have good enough current rating then you can skip the 12 V relays and control the 12 V of the motors directly with the 1st relays solutions with transistors instead of relays are possible too. but it can be left for later if the motors are from power tools then i think they take like 5 - 10 A each
kendallickes (author)  110100101108 years ago
Check this out
wire diagram.jpg
what you have now can be made with 2 relays and not 4 now add the 4.5 V relays to the existing stuff you can use the car battery instead of the second battery if the omron 8567 relays are 12 V. you can use it if the relays are lower voltage too if you add resistors the 4.5 V relays can be replaced with transistors. its more compact and the batteries in the 4.5 V device live way longer
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