calculating frequency of oscillator

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
the digital gate switching thresholds aren't well controlled, speced - the equation just gets you in the ballpark - you have to trim for any accuracy whatsoever

the 555 timer circuit chip has much tighter thresholds - can buy CMOS version too
 
Last edited:
On the other hand, the three component circuit in post #6 can be knocked out on a breadboard in a few seconds and find out.

Find the "CMOS Cookbook" somewhere. It might even be scanned at this point. Yes the book is from long ago, but CMOS basics are basics, and it covers oscillators.

Having said that, I don't know that the relaxation oscillator is the best choice for something slow like an LFO.
 
The circuit in post 6 is a relaxation oscillator.
The classic astable multivibrator uses two normal gates or two transistors.
Totally agree with you. I just posted an example in post # 6.
Now, circuit with two logic gates:
2009624215146620.gif
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.