Thank you. I finally had a chance to get back to this and I loaded your file to see the PWM signal. 50uF seems to work for the simulation. Thanks again.

OK there is a bug in the PC version. In the simulation settings, unchecking the "Auto throttle" checkbox and changing the setting to 10uS and 2000Hz doesn't save when you click Apply and Close. It reverts back to 1500Hz, 666uS. I tried to neaten up my circuit a bit and double checked all the connections but I cannot get the PWM signal to show up or the LED to dim with the pot. When you get a chance later to simulate my circuit on the PC version, could you upload the .cru file so I can load it and see how you got it to work? Thanks again.

Wow, thank you for the fast response! I will try your suggestions and see if this works. Glad to see the PWM signal on the scope.

I second this. Would be great to have Pi Pico component and Python support.