Brief CMOS NOT logic gate signal inverter circuit BS250 2N7000

N channel and P channel MOSFET are typically used as solid state (no moving parts) switches.

CMOS complementary NOT gate signal inverter circuit with 2N7000 BS250 transistors schematic diagram by electronzap
CMOS complementary NOT gate signal inverter circuit with 2N7000 BS250 transistors schematic diagram by electronzap

N channel enhancement mode MOSFETs are a low side switch that is turned on by a high level voltage (close to +5V with a +5V supply.). Whereas P channel enhancement mode MOSFETs are a high side switch that is turned on with a low level signal (close to ground when ground is the negative supply).

When wired as shown above…

  • High input (switch not pressed) results in a low output (connection to ground).
  • Low input (switch pressed) results in a high output (connection to +5V).
  • Connection in the 2 cases listed above, means that the output is connected through a transistor that is conducting as well as it can.
  • MOSFET gates just respond to voltage. You can safely connect the gate directly to either supply voltage (hence the pushbutton switch connecting directly to ground) as long as the voltage doesn’t exceed the max rating. When not pressing the switch, 5V will still be at the gates though the (pull up) resistor. Whereas, while pressing the switch, the resistor limits how much current goes from +5V to ground.


I got my 2N7000 N channel enhancement mode MOSFET from the assortment of semiconductors kit above. The link is one of my Amazon affiliate link ads.

Video:

Brief Circuit Schematics with Short Video List of Pages

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