Light Circuit Sim

211

01:54:43

Basic LED sim with NPN's and a NOT using a 5V source.

Click switch to change mode

The gate switch will can be swapped for RPI GPIO pin.

To prevent unnecessary switching of an N-Channel FET in place of the NPN just use a 10-100k ohm pulldown on the gate.

published 3 years ago

wyoelk

3 years ago

The default setting in this app for LEDs is 2 volts and 20 milliamps. So the current limiting resistor would be 3.3v-2v=1.3v/20ma=65ohms. Of course in real life each LED varies by application color etc

deansanders21

3 years ago

Thanks for the suggestion @wyoelk, will fix now, adding an op amp comparator to translate the 3.3v signal from a gpio pin to 5v. I have some motorolla MC33174s that will handle this no problem!

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