Well, the problem was simple. Buffers were working some time before, but they did not work anymore.

You see the craters?

You see the craters?

There is not much left to say. Poor buffers had gotten 20V on the sigal outputs (nominal is 5V).

I soldered new chips and it works like new.

Tagged with:

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>