Changing Ohm load using relays

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chrispcwiz

Member - Posts: 11

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

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wirewise

Moderator - Posts: 489

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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~~

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hot_shot_guy123

Copper - Posts: 114

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.

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2DamnLoud

Member - Posts: 5

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

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wirewise

Moderator - Posts: 489

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~~

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2DamnLoud

Member - Posts: 5

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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Changing Ohm load using relays

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