Interesting 16V thought: knock light LED?

[juliemac57@hotmail.com (Julie Macfarlane)]

If the attaching wire was sent to a HiZ (High impedance >10meg ohm) input 
amp, (a comparitor would be better) the signal drain would be minimal. The 
output could be sent to pin2 of a 555 timer in monostable mode.
As a monostable the output would drive the led for X# seconds each time the 
input was triggered. A potentiometer sets the time on for the LED time the 
input pulse arrives.

<$10.00 from Radio Shack for the parts.



Julie Macfarlane
Menlo Park Research & Development
Internet Application Developer
www.menloparkrandd.com
www.montgomeryweb.org
Amsterdam NY





>From: T Berk <tberk@mindspring.com>
>To: Ryan H <rhock99@epix.net>
>CC: Brian McGarvey <brianm@earendel.org>, scirocco-l@scirocco.org
>Subject: Re: Interesting 16V thought: knock light LED?
>Date: Fri, 28 Mar 2003 03:28:39 -0800
>
>Ryan H wrote:
> > > On Thu, 27 Mar 2003, T Berk wrote:
> > >
> > > > Ryan H wrote:
> > > > >
><snip>
> > > > > know, there has to be some wire with a basic signal
> > > > > (12V or 0V) for knock, so I can hook an LED up to see
> > > > > when knock is present.
> > > > > Anyone already try such a thing?
> > > > > ___________________________
> > > >
> > > > <http://home.mindspring.com/~tberk/index.html>
> > > >
> > > > Can these schematics help any?
> > > >
> > > > TBerk
> > > >
> > > One way to do it is via  a compare ckt.
> > > if the output of the CIS box == output of the knock box no knock.
> > > if != retard occuring.
> > > brian
> >
> > Brian: Sounds a bit too complicated to make... although I'm no 
>electrical engineer.
> > TBerk, your schematic is pretty good, so maybe you have some ideas - do 
>you think a 12v LED with the positive lead to pin 13 would do anything?
> >
>
>I would be concerned with signal drop if you just hook up an LED, I'd
>want you to wrap a coil around the signal wire (#13) and use it to
>trigger an LED circuit.
>
>Wait, all that would do is flicker when the mic that is the K/S was
>fed ping. Better yet would be to get a signal from when the K/S box
>goes into action, lets see...
>
><http://home.mindspring.com/~tberk/_uimages/Knock-Sensor-Diagram.JPG>
>Looking at David's pic I see a test port on pin #4, this might be what
>your looking for.
>
>
>TBerk
>
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