P channel Mosfet switch schematic - diyAudio
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Old 18th March 2009, 05:17 PM   #1
diyAudio Member
 
Join Date: Dec 2003
Location: Massachusetts
Default P channel Mosfet switch schematic

Hi folks,

For my project I have a 5 volt signal that is coming in and when it does (high) I want to switch a 12-13 volt supply to another part of my circuit.
The 5 volt is low current and the 12-13 volt is only pulling around 120mA.
I am using a P channel mosfet as a switch (I can't use an N channel as I can't isolate my system from ground). My main load does not have any weird inductive or capacitive loads, its real simple to drive.

I am not great at electronics schematic design but I am good at designing PCB boards and breadboarding etc.
Does anyone have a schematic for this simple circuit? it would help me out a great deal!

Thanks!
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Old 18th March 2009, 05:35 PM   #2
diyAudio Member
 
Join Date: Dec 2003
Location: Massachusetts
Looks like with the P channel when the input is high the output is low and vice versa, if I used a NOT logic chip on the input of the mosfet this should work to switch things back to normal?
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Old 18th March 2009, 08:53 PM   #3
mjf is offline mjf  Austria
diyAudio Member
 
Join Date: Jan 2009
Location: Austria
hello.
a not logic inverts the signal.........
or if you need more than 5v output you can use an inverted opamp (with gain ).......
greetings...............
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