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MOS FETS in passive crossovers
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LeruSound View Drop Down
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    Posted: 24 May 2018 at 8:01pm
It's the second time that I see a Passive crossover made on PCB with some MOSFets screwed on the heatsink. I also noticed there is a zener diode and a diode bridge. I assume this is iniorder to get an envelope out of power signal and probabily use fets as limiter. Is it?
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Points: 4947 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2018 at 8:33pm
what's the model of mosfet?
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LeruSound View Drop Down
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Points: 171 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LeruSound Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2018 at 9:20pm
I saw an IRF540, but it's a common used one.. so N-ch enhancemren..
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snowflake View Drop Down
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Points: 3122 		Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 12:52pm
this sort of thing?




Edited by snowflake - 25 May 2018 at 12:53pm
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studio45 View Drop Down
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Points: 3864 		Post Options Post Options   Thanks (0) Thanks(0)   Quote studio45 Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2018 at 2:57pm
I've seen that in a few boxes, usually "protecting" the tweeters- although by the time such boxes get to me the tweeters and MOSFETS are usually blown anyway - I don't understand why you wouldn't just use a lightbulb instead? 
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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LeruSound View Drop Down
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Points: 171 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LeruSound Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2018 at 3:45pm
Since I am not in commercial I wouldnt use light bulbs nor MOSFets limiters, but I understand why they do.. guess light bulbs is a less "aggressive" solution, but never conviced me at all.

Edited by LeruSound - 27 May 2018 at 6:53am
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snowflake View Drop Down
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Points: 3122 		Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2018 at 10:53pm
a polyswitch in series with R1 could protect the MOSFETs and make that circuit very reliable.
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