I have a simple NOT gate circuit with the following arrangement.
LED D1 will light up by default. If I push SW1, the transistor Q1 will activates and D1 will be turned off. This NOT behaviour works just fine.
The problem is, I want D1 to turn off gradually (the gradation has to be noticeable by humans, so 1 or 2 seconds would probably enough). I put the capacitor C1 for that very reason. I thought by having C1 in that position, the activation of Q1 could be made gradual, because initially currents would be consumed by C1's charging.
It doesn't work. D1 still have an abrupt change of state from ON to OFF. I wonder if I did something wrong with the circuit design?