I am learning about transistors, and I've designed this oscillator circuit.
In the simulator it works perfectly, and in my brain it makes sense, but when I try to implement the circuit in the real world it stabilizes with one side of the capacitor 0.7V above the other. I expect it to repeatedly charge and discharge the capacitor.
Start w/ the capacitor discharged and all transistors are in their cutoff mode.
If the cap is discharged then it's like a short circuit, so R1/R2 just form a voltage divider, which has a lower voltage than D, so Q1 is not yet forward biased. This means Q2's base is starved for current (which it must get from Q1's collector).
As the cap charges, the voltage at A will eventually exceed the voltage at D, causing Q1 to become forward biased. This will in turn cause current to flow from Q1's collector to Q2's base, forward-biasing Q2 as well.
Now there is a 'connection' (via Q2's collector/emitter) between D and B. This pulls D down to the same voltage as B, keeping Q1 forward biased until the voltages at A and B are equal.
Now the voltages at A, B, and D are equal, reducing the current through the transistors to zero and returning to the original state.
Any information on what I may be missing or how to make my circuit work IRL would be greatly appreciated, thanks!