![EEVblog show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/032/072/small/eevblog-the-electronics-engineering-video-blog.jpg)
Summary: Fundamentals Friday Dave answers a beginner forum question of why their 74HC390 based breadboard counter circuit does not work properly. Let’s get up to our armpits in datasheets and troubleshooting. A two sentence forum response turned into a step-by-step 27min video investigation involving rise and fall times, setup and hold times, metatability, optocouplers, bypassing, open ...