I am wanting to control 5 voltage signals with MOSFETs (0-1V each, through drain-source of each MOSFET) from BNC connectors to then observe with an oscilloscope. The circuit is optically isolated and activated by a transistor on the 12V VCC line.
I have a few questions about the feasibility of this due to my basic knowledge; 1) Is it actually okay to connect MOSFETS like this, will they operate correctly/simultaneously or will the small voltage signal not flow?
2) I understand that the capacitance of the MOSFETS will slow down the switching, how do you calculate this effect?
3)Is 12V enough to switch all of the MOSFETS?
4)Are the pull down/gate resistances appropriate?
Please note I am very new to circuit design/electronics, any direction on this would be much appreciated.
The MOSFET I have available to me; http://www.mouser.com/ds/2/149/FDV305N-888896.pdf but can change it very easily The optical transistor; http://datasheet.octopart.com/HFBR-2522-Avago-datasheet-7278264.pdf