Electronics > Beginners
Problem in TINA simulatiing astable LED flasher
alanc:
Hello, I'm new to electronics and eevblog forum (although I already watched a lot of Dave's video :-DD). I am trying to figure out how the astable circuit works. I created a circuit in TINA v11 and simulate it using Transient Analysis but the result has problem.
When I set the end time to 2s, the result looks somewhat OK. VF1 and VF2 will oscillate. But when I set the end time to larger value like 10s, both VF1 and VF2 always at same level. Circuit and simulation results attached.
Is the problem of my circuit? Or I need to adjust some TINA parameters to make it right?
Sorry in advance if the post should not be here or anything inappropriate. |O
jimmc:
It's a common problem with simulators that oscillators do not start without help. In the real world circuit unbalance or noise is usually enough to set things off.
The simplest solution is to add a timed switch from one base to ground, closed for say 1mS from time zero and open after that.
This will provide the 'kick' to start the simulated oscillator running.
Jim
tszaboo:
It is just the way a SPICE simulation works. It is not really suitable to work with digital-ish circuits. But try the Steady state solver, it is more relevant to evaluate this.
Zero999:
Change the value of one of the resistors or capacitors by 0.1.
alanc:
I have tried this before but no help. I don't know why. But thanks anyway :-+
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