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#1
March 8th 04, 06:33 AM
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Using a power mosfet to select from various power sources for HFrig
Anything I should be concerned about with my plans to use a power mosfet
to choose amongst various 14V sources to power an IC706. This is for automotive use. I want to use my deep cycle batteries while the engine is off, and use the engine/battery/alternator while the engine is running. Thought I'd use a couple of big mosfets to select one or the other. thoughts? - jim |
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#2
March 8th 04, 11:13 AM
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Tried it. Save yourself some grief and use relays ;-)
-- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
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#3
March 8th 04, 11:13 AM
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Tried it. Save yourself some grief and use relays ;-)
-- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
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#4
March 8th 04, 03:33 PM
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Care to expand a bit on this?
Gregg wrote: Tried it. Save yourself some grief and use relays ;-) |
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#5
March 8th 04, 03:33 PM
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Care to expand a bit on this?
Gregg wrote: Tried it. Save yourself some grief and use relays ;-) |
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#6
March 9th 04, 12:05 AM
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Behold, James W signalled from keyed 4-1000A filament:
Care to expand a bit on this? Sure! I found that the RDSon was too high with most MOSFET's. The best I could attain was a 1/2 volt drop at 1 amp load. When the CB linear came on, it increased the drop to 6 volts (60 amp draw). So, I went to the auto wrecker and got a couple of 30 amp relays and a 100 amp contactor for the job and it worked perfect. -- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
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#7
March 9th 04, 12:05 AM
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Behold, James W signalled from keyed 4-1000A filament:
Care to expand a bit on this? Sure! I found that the RDSon was too high with most MOSFET's. The best I could attain was a 1/2 volt drop at 1 amp load. When the CB linear came on, it increased the drop to 6 volts (60 amp draw). So, I went to the auto wrecker and got a couple of 30 amp relays and a 100 amp contactor for the job and it worked perfect. -- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
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#8
March 9th 04, 12:59 AM
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On Sun, 07 Mar 2004 22:33:12 -0800, James W
wrote: Anything I should be concerned about with my plans to use a power mosfet to choose amongst various 14V sources to power an IC706. This is for automotive use. I want to use my deep cycle batteries while the engine is off, and use the engine/battery/alternator while the engine is running. Thought I'd use a couple of big mosfets to select one or the other. thoughts? Why not a pair of BIG Schottky diodes? |
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#9
March 9th 04, 12:59 AM
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On Sun, 07 Mar 2004 22:33:12 -0800, James W
wrote: Anything I should be concerned about with my plans to use a power mosfet to choose amongst various 14V sources to power an IC706. This is for automotive use. I want to use my deep cycle batteries while the engine is off, and use the engine/battery/alternator while the engine is running. Thought I'd use a couple of big mosfets to select one or the other. thoughts? Why not a pair of BIG Schottky diodes? |
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Linear Mode
