Hello everyone,
I'm new here and I have a question hopefully someone can help me with.
After a long break from the hobby, I'm getting back into things and I'm attempting to teach my son at the same time... hard to do when I keep forgetting so much.
Anyhow, I decided to use Multisim for a simulator.
The circuit I've built is just a simple oscillator using a 4001 NOR gate. It seems that Multisim isn't calculating the RC time constant correctly. The frequency Multisim is showing on the Oscilloscope is way faster than it should be when I built it on the breadboard with my son. I've been pulling my hair out all day trying to figure out what's going on.
Here's a screenshot of the Oscilloscope and the circuit:
https://i613.photobucket.com/albums/tt214/stevenbeckman/NANDOscillator.png
If someone could throw me some advice, I'd really appreciate it. If I do the math for C1 to charge through R3 I get 220 milliseconds which is right for what I'm seeing on the breadboard.. the scope in Multisim is showing a tim/div of 200nS which is way faster than it should be.
Thanks in advance for any help that can be offered.
I'm new here and I have a question hopefully someone can help me with.
After a long break from the hobby, I'm getting back into things and I'm attempting to teach my son at the same time... hard to do when I keep forgetting so much.
Anyhow, I decided to use Multisim for a simulator.
The circuit I've built is just a simple oscillator using a 4001 NOR gate. It seems that Multisim isn't calculating the RC time constant correctly. The frequency Multisim is showing on the Oscilloscope is way faster than it should be when I built it on the breadboard with my son. I've been pulling my hair out all day trying to figure out what's going on.
Here's a screenshot of the Oscilloscope and the circuit:
https://i613.photobucket.com/albums/tt214/stevenbeckman/NANDOscillator.png
If someone could throw me some advice, I'd really appreciate it. If I do the math for C1 to charge through R3 I get 220 milliseconds which is right for what I'm seeing on the breadboard.. the scope in Multisim is showing a tim/div of 200nS which is way faster than it should be.
Thanks in advance for any help that can be offered.