Flip-Flop

295

04:05:45

Simple Flip-Flop Circuit 

published 11 months ago

Robert_Kidd

11 months ago

Increase the 10k resistors to 33k.

yunus2796

11 months ago

Why?

Redstone_guy

11 months ago

It’s because the circuit doesn’t work in the simulation as it is now. The resistances in the RC networks are not large enough for oscillation to be simuated.

ViolationMad

11 months ago

It does simulate just fine, the circuit is in equilibrium tho and thus won't start to oscillate. If you add a switch, e.g. between the cathode of the red LED and ground, it will work as intended.

Robert_Kidd

11 months ago

Answer: with the values you have used the circuit doesn’t ’auto-start’. A rule of thumb is that the base resistor values should be 10 times the collector resistor value (approx.). In the simulator the transistors are perfectly matched, in other words they are identical. Also each resistor, capacitor etc. are precise values. As such the circuit is perfectly balanced and doesn’t always start up. This would never occur in a real physical circuit.

Robert_Kidd

11 months ago

Using a switch (as suggested) to unbalance the circuit can cause it to break into oscillation.

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