De-Bounced Logic Gate RS

105

01:09:47

Treat the switches as if they are Normally Closed (in the current position) Pushbuttons. Which means click/tap twice. 
Here is what you're seeing: Each switch feeds a quick input signal to a De-Bounce component who's subsequent output signal is fed into the RS Latch. 
In this configuration, it may be difficult to realize the value and moreover, the effect of the de-bouncing components. This is due to EC's always-clean logic gate signals. The effect (or lack thereof) would be made more apparent with a discreet circuit, even in simulation. 
Keep in mind that any de-bounce circuit is only necessary on a real-life build, and only if the circuit requires a signal by means of a mechanical switch.

published 10 years ago

jdlogic

10 years ago

Thank you will look at this in the later AM hours! Much appreciated

hurz

10 years ago

Sorry Sine, you know i am very critical, but what the hell is this? Could you give a more detailed but short explanation what the double inverting thing in front of this RS latch is all about. The RS latch itself is already enough! Or are you trying to show some delaylines? Keep it simple ;-)

jdlogic

10 years ago

I asked him to make a debouncing circuit the other day. What building this circuit will show is any time you activate a mechanical switch there is a voltage bounce( the switch goes from on to off repeatedly until it finally settles. This circuit removed the bouncing normally associated with mechanical switching. Denouncing is quite important when it comes to Digital Electronics as the components are very sensitive to changes in voltage/current. NOTE: Bouncing is when you first turn a switch on and for a very sgort amount of time you will get(for all intensive purposes) a triangle wave before the voltage going through the swotxh settles.

Sine_eyed

10 years ago

Thank you jdlogic, for that concise reiteration. You follow along hurz?..

hurz

10 years ago

@jdlogic, thanx for the time you spend to explain, however I was talking about this circuit. I know what bouncing is. But this circuit makes no sense, except the RS part, but the two inverter gates at each input do not have any impact. Or at least they have a secrete which sine_eyed might tell us?

Sine_eyed

10 years ago

There's no secret hurz, no mystery. I feel my description was clear enough, and since the three of us know what bounce is and what debouncing does, I am at a loss to what exactly you want me to explain. Please comment back, it's no big deal- I would just rather save an explanation until the time I know what it is I'm explaining! ;^)

hurz

9 years ago

Ok, this is quite some time back but let me explain. See the 1k parallel to the nand. Its not having any effect to the following gate, its just overruled by the parallel nand gate output. Remove it. The 10k also makes no sense as long gates in EC, e.g. cmos gates in real, do have a infinity input resistance. Remove it! Whats left over, 2 nand's in series which are working as double inverting logic. Remove them! Same for the lower switch part. Whats left over? Just a RS latch. And this RS is doing the debounce nothing else in your circuit. But only if you do not allow to press both buttons at the same time.

add comment in editor