One wire control for up and down. Rev 1.7 - update Fet high current

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02:46:32

Track (one wirer control for up/down solanord's) 
The lights on the top right side are the solanord's the left one is Down and the right one is Up. Up requires a pump and Down dose not, so the up light would control the solanord and the pump. Where the down light justs controls the solanord only.
The Leds below the lights are just a indercatter only, for visual only.
Buttons on the left side are as (top) is Down, the one below that is Up.
I have traced the one wirer (Colour blue)
IRF540N Fet Transisor  Note: Fets on this app are reversed i'm not sure why this is. 

The circuit  shows a p - channel fet but the fet is a n - channel..

published 9 years ago

2ctiby

9 years ago

When either mosfet is switched on with its gate open: volt drop across it is 3.61V ... current flow through it is 10.3A ... So when P=I²R or P= IV Power dissipated as heat at each mosfet ≈ 37.18W ... R= V/I so R≈ 0.35Ω (this is your created Rds₍ₒₙ₎). ... The mentioned N mosfet IRF540N has a Rds₍ₒₙ₎ = 0.04Ω... You can see then that your schematic mosfet Rds₍ₒₙ₎ is about 10 times greater than your bought mosfet, and so the schematic needs altering. See here for help on altering your schematic mosfet Transconductance to make your mosfet here similar to the bought one mentioned.... http://everycircuit.com/circuit/5927322113015808

2ctiby

9 years ago

The mentioned bought mosfet has a Vgs₍ₜₕ₎ of 2v to 4v ...A setting of say 3v would be a reasonable alteration there ... see same link above to set that VTO

2ctiby

9 years ago

You will then need to re-adjust your lamp settings to suit the now higher current and volts since the full volts will now be dropped as they should be across the lamp rather than across the mosfet switch.

DavidDeLaTorre

9 years ago

Thanks forthe info. 2ctiby

2ctiby

9 years ago

You are welcome...Those altered adjustments that you have now done look really good.

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