Decoupling Capacitor Experiments

RE: Decoupling Capacitor Experiments

jw0752 — Sun, 23 Jun 2019 14:25:15 GMT

Hi Jon,

I like your creative approach to circuit board fabrication. I will have to try this some time. I enjoyed reading your experiment.

John

RE: Decoupling Capacitor Experiments

genebren — Sat, 22 Jun 2019 22:30:13 GMT

Jon,

Nice look at the effectiveness of decoupling capacitors! It is difficult to build the definitive test for decoupling, but your results do show the problem and the benefits of having decoupled supply lines. From worst case (none) to best case (10uF and 100nF), there is a reduction of the supply side glitch of 90%, which is a very good improvement. Had there been any inputs with higher impedance paths, or inputs held closer to their logic thresholds, you might have been able to see some mis-triggered output.

Nice work!

Gene

RE: Decoupling Capacitor Experiments

DAB — Sat, 22 Jun 2019 19:59:33 GMT

Nice post.

DAB

RE: Decoupling Capacitor Experiments

Jan Cumps — Sat, 22 Jun 2019 10:41:46 GMT

Philips! Virtually everything I touched when studying electronics was Philps. Components, power supply, oscilliscope, multimeters. signal generators, data books.

I'll try to redo this exercise with a modern low power logic device switching a high impedance load. I'm wondering (at low activity times in my life) if they still need decoupling.