Tip Of The Day / Switch Contact Debounce Circuit

This video will cover how to build a very simple switch debounce circuit. It will use a RS flip-flop so no RC timing is involved, which makes it handy for troubleshooting.

[SigEpBlue]

Nice video. It's helpful, even necessary, for those learning electronics to understand the switch contact bounce phenomenon, and the hardware debounce techniques to alleviate it. There are more methods, however, such as using buffers with Schmitt trigger inputs, e.g. SN74LS13 and 14, and debouncing in software (assuming an input to a microcontroller). Just remember that it's almost always faster, more reliable, and easier to troubleshoot when you do things in hardware rather than code.

[ShellacScrubber]

I had not seen the buffer plus spdt combination before.It's quite ingenious. It provides a good illustration of how versatile and useful the 4000 series logic still is.
I recently revisited the video you did about using CMOS logic devices in linear mode.It's all fascinating stuff.
I even managed to find a design(Everyday Electronics magazine Oct 1978 ) for an AM radio receiver that uses a 4011 quad nor gate !

[caletorino]

I read a document called “A Guide to Debouncing” by the Ganssle group. Helped me a ton.

Some people referred to it as the denouncing “Bible” but I must say this video was short and straight to the point. With a touch of old school class.

The 4000 series was a welcome surprise. I’m younger but I’m pretty sure this will save me in a pickle.

[Cyklonus]

The capacitor and resistor itself also works quite well :)

[marios]

Very useful! circuit! Thank you for your precious Tutorials!

[nguyenthinh]

Still follow you after years, from fpga cpld videos

[romancharak]

Very nice circuits for Microcontroller inputs.

[ccv]

Excellent video, really great!!! Thank you so much.
I subscribed, now I will like this video also.

[PhG]

Awesome tip! I've found out about this many years ago... the hard way.

[ronen]

Muy buena conferencia, gracias por difundir el conocimiento

[lohikarhu]

There's a nice cmos 6 channel switch debounce, adjustable timing...
MC 14490

[vanhetgoor]

Very thorough but what is wrong with only a capacitor or two near the switch?

[AnalogDude_]

3:17 Neat, but it would be better to use a transistor than a little common switch.

[eitantal]

Yikes, That's a lot of complexity. I do it in software. If there is no software, then I use a capacitor. I Bet a microcontroller will be cheaper than these 2 ICs