Forums » CircuitLab Support Forum

I am trying to simulate a circuit that's made in the real life. The circuit comes from an online course that came with electronics kit called Pirates Electronics.

Here's the screenshot of the circuit description (online course slide): https://ibb.co/fSqbhA

And here's my CircuitLab model: https://www.circuitlab.com/circuit/7n9cjtbqkxuq/pirates-test/

In real life, the LED lits up and then slowly dims away. I'd expect to see this reflected in the voltage graph for NODE1. But the transistor never opens, because the capacitor apparently is immediately charged so there's never a positive voltage at the transistor's base.

At least that's my understanding of what happens in the simulation. Can I please get some advice how the model properties can be adjusted so that it behaves as its real life counterpart does?

Ok, the problem was that the simulator was skipping the initial behavior of the circuit. Changing in Simulate / Time Domain the "Skip initial" setting to "Yes" fixed that. I am confused why such a counter-intuitive choice of values for this setting :-/