Re: Debouncing....at About 1Mhz

On Sat, 03 Nov 2007 20:28:38 -0800, D from BC
<myrealaddress@xxxxxxxxx> wrote:

On Sat, 03 Nov 2007 20:00:00 -0500, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:

[snip]

I could handle up to 100nS of edge delay but the circuit loses it's
'cool' appeal.

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It's not 'it's', it's 'its'.

So, you were asking for something frivolously, disregarding the
investment in time someone seriously interested in helping you would
have to expend in order to meet your ~10ns "requirement", when that
10ns spec was just there to make you look "cool" in your bosses'
eyes?
---

Like driving a bicycle instead of a motorcycle. :(

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First you need to learn to walk.
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I can probably do a ultra fast version another day.

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Don't you mean that you can ask someone to do an ultra fast version
for you another day?

Anyway, here's the simulation I promised you, in LTSPICE:

[snipped .asc file]

The concept is there, and it works, so all you need to do is convert
the circuit to a TTL equivalency, if that's what you want to use,
and maybe use some diodes instead of gates to get the chip count
down.

You know how to do that, right?

Larkin's down to two chips, but he's got a lot of RFI going on since
every transition of the input signal generates spikes all through
his delay network and into the air.

ok ...ok..
I guess it's (correct use of apostrophe) not cool to back off on a
spec after some time..
I should have included in the 1st post some dream specs, some lower
and upper specs.
I do have a real justified technical reason for needing minimal edge
to edge delay. Not just for sport...
And I do plan on building a debounce circuit this month.

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OK, sorry about the rudeness, sometimes I just go off half-cocked.
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I was trying to make this point....
If the circuit problem is too heavy then I'll settle for simpler
longer prop. time designs.
Those would be quicker to post and describe. Also, those designs can
be an inspiration to faster designs.

Yup... I've done some DTL circuits to reduce chips.

About your circuit.....

Holy frick batman! :O
What amount should I put on the check? :)

You did the generator too!

I cheated on that ... :P
http://www.members.shaw.ca/chainsaw/SED
2 sine generators and a comparator.

Huh...I didn't know the unused pins could be left open in LTSpice...I
guess I should read the whole manual someday...It was driving me nuts
to hook up all the unused inputs.

Heyy! This is a fun problem :)
I've got papers all over the floor from trying to figure this out on
my own..

k...I'm gonna take this circuit for a test drive... :)

Thanks. :)

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My pleasure! :-)


--
JF
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