carsein
Newbie level 6
Hi,
Right now I'm given a small project by my lecturer to do a vco from 555 timer. The centre frequency of the VCO is 10 kHz. I've already read the application note of the 555 timer and tried to simulated it with pspice. There are 2 problems occur when I try to simulate it:
1) There is a delay in output waveform. How can I make it start exactly at 0 s?
2) I've followed all the calculation from the application note. But I don't get 50% duty cycle and the frequency is not 10 kHz.
I hope you guys can help me with this. Here I attached the result of output waveform of the 555 timer.
View attachment output waveform 555.bmp
Right now I'm given a small project by my lecturer to do a vco from 555 timer. The centre frequency of the VCO is 10 kHz. I've already read the application note of the 555 timer and tried to simulated it with pspice. There are 2 problems occur when I try to simulate it:
1) There is a delay in output waveform. How can I make it start exactly at 0 s?
2) I've followed all the calculation from the application note. But I don't get 50% duty cycle and the frequency is not 10 kHz.
I hope you guys can help me with this. Here I attached the result of output waveform of the 555 timer.
View attachment output waveform 555.bmp