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At less than $2 each, you can't beat the bang for the buck using automotive 12V relays. 

 

If you need a 12V DC power supply to drive the relays you can also get a regulated 12V DC, 1 Amp wall-wart on eBay for about $2 (free shipping).  If you add a 50 cent (free shipping) adapter jack, you don't even have to splice the wall-wart cable.

 

12v dc wall wart and adapter

 

1 Amp @ 12V is 12 Watts.  So this can drive half a dozen standard automotive relays which require just under 2 Watts each as Dale points out.  For a few dollars more you can get 2 Amp, 3 Amp, etc. 12V DC power supplies.

 

OGR will delete direct eBay links but here are search words and current listing #s which you can cut-paste into the eBay search box:

 

"12V 1A DC US power supply" (e.g., eBay # 181939256344)

"DC female adapter jack" (e.g., eBay # 252186410477)

 

 

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