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Changing Ohm load using relays


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chrispcwiz 
Member - Posts: 11
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Joined: March 20, 2002
Location: United States
Posted: April 03, 2002 at 6:22 AM / IP Logged  

hi,

 what about power handling!!??

   thise relays wont handle alot of power that way!!!

chris

wirewise 
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Joined: March 07, 2002
Location: California, United States
Posted: April 03, 2002 at 8:25 AM / IP Logged  
Hey Chris, try this...according to Ohm's law (I = Square Root of (P / R)) at 500 watts at 4 ohms, current would be 11.2 amps, at 1000 watts at 4 ohms, current would be 15.8 amps and so on. Rated contact current capacity of a Bosch relay = 30 amps, Potter & Brumfield relay = 40 amps. Rated contact power capacity @14VDC = 500 watts...(500 watts@14VDC = toasted voice coil!) Power handling looks fine to me :)
Try it yourself     https://www.the12volt.com/ohm/page2.asp#12
~~wirewise~~
hot_shot_guy123 
Copper - Posts: 114
Copper spacespace
Joined: March 09, 2002
Location: Canada
Posted: April 03, 2002 at 4:33 PM / IP Logged  
This is a handy feature to have so you don't have to mess with setup.
2DamnLoud 
Member - Posts: 5
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Joined: April 03, 2002
Location: United States
Posted: April 03, 2002 at 9:41 PM / IP Logged  

Have any of you ever actually tried this?!?

12 volt and ground running with the speaker wires in a magnetic relay,......

damn that's gotta be noisy

wirewise 
Moderator - Posts: 489
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: March 07, 2002
Location: California, United States
Posted: April 04, 2002 at 9:17 AM / IP Logged  
Yup, no noise in either mode!
~~wirewise~~
2DamnLoud 
Member - Posts: 5
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Joined: April 03, 2002
Location: United States
Posted: April 08, 2002 at 9:28 PM / IP Logged  

I've had the diagrams for a long time, never tried either though

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