12vac to 12vdc

[jerrymyersmills]

Dear friends
i have bought a 12VDC relay for project work.The line voltage is 220VAC so i bought a 12V transformer to convert the 22ov into 12V for smooth operation of the relay but i keep hearing this BUZZING sound anytime the relay is working.
Folks i am a bit confused.
I suspect that the transformer is supplying 12 VAC to the relay instead of 12VDC.I want to convert 12vac into 12VDC and need some assistance to be able to achieve this.

[SgtWookie]

Your DC relay may have a diode across its' coil. That would short out the transformers' output for 1/2 of the cycle.

You can get a small full-wave bridge rectifier from your local Radio Shack store for around $1.39+tax.
http://www.radioshack.com/product/in...ductId=2062581

It has four leads; two are AC (indicated by ~) and the other two leads are DC, marked + and -. You just connect it up. If the relay still buzzes, you may need to add a filter capacitor across the bridge output. This would probably do the trick:
http://www.radioshack.com/product/in...tic+capacitors

[madhusudan.pigeonsembs]

You can follow this attachment.......
I think you will be very much clear......