Every once in a while, I run across or design a circuit worth saving. This Zero Crossing Detector Circuit is one such animal. It's operation is not restricted to a pure sine wave, but that's the application shown. The circuit is based around the LM324 op amp seen above. Use it as you see fit and enjoy... The original image is available in adobe pdf file format.

OK, that's about it, good luck and enjoy.
Cheers,
Skipp
(Contact Email and Menu Icons below)

We/I get a lot of Email from visitors who drop into these file down load description pages via a web "Search Engine" (like Google). Vistors are not able to locate the file download icon for that specific description page. There is a simple way to find the file download icons on the main www.radiowrench.com/sonic page...

First and best: Use the menu icon just below to the main sonic page.

Second: Back space out the page your now looking at in your browser location line. As an example, using the http://www.radiowrench.com/sonic/so2004.html description page. Remove the last portion of the web location with the keyboard back space key to read http://www.radiowrench.com/sonic then press your Enter Key to reload the main sonic page "just in front" which would probably have the information you're looking for. This works on most of the current browsers at most web sites.