relay

[bob]

can 12v car relays be used with 12v ac or do i have to use a 12v dc for the switching sideheadbang, as i thort the other side would not matter :^O

bob

 

[Apache]

Now therein lies an interesting question, Kate.

:|

 

[The Godfather]

http://relays.tycoelectronics.com/appnotes/app_pdfs/13c3250.pdf

The Godfather

 

[SPECIAL LOCATION]

can 12v car relays be used with 12v ac or do i have to use a 12v dc for the switching sideheadbang, as i thort the other side would not matter :^O bob

Hello bob.

As the Dons rather good links describes...

the magnetic field generated by the current flowing through the coil of the relay will alternate if an alternating current is applied...

this would cause the relay to buzz or 'chatter' repeatedly on and off.

This principal can be used with traditional type door bells,

(AC supply to a coil move armature in & out repeatedly to knock the bell dome.)

For the relay to stay on in one position the magnetic field must be just pulling in one direction to prevent repeated on /off/on/off etc..

this is the basic difference between a "relay" & a "contactor"

relays generally DC supply.

Contactor AC supply with built in rectification to hold it 'ON'.

HTH

 

[SPECIAL LOCATION]

Just to add...

because the metal armature of the relay isn't actually 'polarised' 'north' or 'south' with regard to the magnetic field, it doesn't mater which way your DC supply is connected, as long as a field is created it will pull the magnetic

armature metal closer to the coil where the field is generated.

Guiness Drink

 

[bob]

how about 6V DC then, because i have found a psu rater at 6V, but it is a battery charger, in my head it works but i want to run it past you guys first

bob

 

[mikep]

You have not said what you are trying to do and seem intent on using this relay!!

Why not just get a ac 12v relay.

Or are you trying to now switch a 12v dc relay with this 6v power supply, I'm confused and that does'nt take a lot these days: O.

Regards Mike.