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Hi,
your schematic seems to be from a simulation tool. Why don´t test it? What are the results.
Usually switching resistive load is the most uncritical situations. Why do you worry?
Klaus
R8 and R9 are way too low in value as each resistor will be dissipating 10 watts.
Change then to something like 10k ohms.
If you want to determine the power dissipated in a device after a transient simulation, just roll the cursor over the device will holding the ALT key until the thermometer symbol appears, and then left click.
All those dangling nodes and wires makes for a messy schematic.
Just remove them with the cut (scissors) tool.
You talk about 20mA, but you circuit shows about 1000mA ---> this is a factor of 50.Yes I know they are too low. The reason for the circuit is I'm using a switch with a min wetting current of 10mA. the switch contacts are between R8and R9 . ,so i can make them a value that say delivers 20mA .
I was just playing with the values of R8 and R9
V_th is where the MOSFET starts to get conductive.. maybe just a couple of microamperes. (read datasheet).. I just need to ensure that the potential devided is more than the min Vth for the fet