astablemultivibratortransistors
I was wondering if you can help me to know why my circuit is not working. I have tried with different pre-existing circuit values to make sure the circuit was working properly before I put my calculated values but I am not able to obtain an oscillating output…
Thanks!
1) Your LED current limiting resistors should be 300 ohms instead of 330k ohms.
2) DIS should be connected to THR, not to TRG.
3) VS1 should be a voltmeter, not a voltage source.
4) The connection to the junction of R4 and C1 should be made at the dot.
5) There needs to be 0.1µF between U1 pins 1 and 8. (Real World)
6) Why is the battery a MOSFET?
It look like you have your collector connect to ground. The 2n3904 Transistor pinout looks like this;
Best Answer
To get an oscillator in spice to work, you need to give the circuit some initial conditions to get it to start. In the real world, noise does this. In a simulation, the bi-stable circuit needs to 'tip' one way or another to start it ringing.
Try these links to help you set initial conditions.