Hi , i wanna your opinion on this design before doing it on a PCB, whethere it has something wrong or not , also i added the 2n2222 to make an ENABLE like pin to use it for PWM ..
Still not right.
The A from my schematic is the direction. If you just connect PWM where it should be VCC it will malfunction.
You should add 2 more NAND gates to make some sort of MUX, with the Outputs and "PWM".
Then, in your power section, probably the MOSFETs gates capacitances will interfere your output waveform, you should drive them with push-pull or totem-pole drivers.