Do you know how much voltage you get from the speaker when you "brush" it? I tapped (not brushed) a little oval 8 ohm speaker, and got output pulses of ~0.1V - 0.4V, depending on how hard I tapped it. How and why are you touching (you said tapped, then you changed to brushed) the speaker?

__________________
Ron

 

Just kind of a light brush, it's a poly spealer from a pr of headphones like 32ohm really light plastic, real soft and crunchy. I read about ~.2 volts on this one with a light brushing, enough to make it crunch just a little. brush more than tap but a light tap would be about the same.

 

Does it need to require the same number of touches before each trigger, or do you want it to be a function of how hard you touch it and/or whether you tap it or brush it? In other words, do you want the circuit to basically "count" the number of touches? What is the maximum and minimum time between successive touches?

__________________
Ron

 

No, counting isn't necessary. The brushing of the poly speaker will be a constant,It will always be the same. but being able to adjust the time between when the brushing starts and the 555 fires is a must. For example, During "Set Up" I can adjust the time it takes when I start the brushing of the speaker and when the 555 fires, and change it if necessary. Maybe giving between 1-15 minutes between when the brushing starts and the timer fires.

 

Hee, hee.
I am a dirty old fondler!

__________________
Uncle $crooge

 

You didn't answer this question from my previous post:The answer is important.
Another question: What might be the minimum and maximum number tof touches required for triggering, i.e., you want it adjustable, but over what range?

__________________
Ron

 

We always suspected that.

__________________
Ron

 

Once the brushing starts, it will continue at a constant, it would be milliseconds between brushes. Imagine brushing your finger back and forth on the speaker. Maybe 500 brushes to start, like one minute, going up from there to 15 minutes before the timer fires.

 

I am an audio guy but I have never fondled a speaker.
Most girls can't speak anymore after being fondled 500 times in one minute.
I got slapped once.

__________________
Uncle $crooge

 

Aww, c'mon we all know you have fondled at least one speaker.

 

Is her moaning almost the same as speaking??

__________________
Uncle $crooge

 

One more thing that might clarify things, I don't want any stray brushing to do anything only trigger the timer when it's sustained for a few minutes, hence charging the cap idea.
George

 

Capacitor leakage time constants pretty much preclude your cap charging idea. I have hacked out a circuit that basically keeps a cap charged to a fixed voltage so long as the brushing is continuous, and that voltage trips a comparator. The output of the comparator starts an oscillator which clocks a counter, and it simultaneously removes the reset from the counter. If the brushing stops before the counter times out, the comparator detects that condition, turning off the oscillator and resetting the counter.
If the counter does time out (time adjustable 1-15 minutes), it stops the clock but does not reset itself, effectively latching the counter output until the brushing stops. You can take the counter output and trigger a timer, or whatever. It might not work with your speaker without some tweaking, because I don't know what the actual signal out of it looks like.

__________________
Ron

 

I thinkI might have most if not all of that sitting on my desk right now. Will a CD4017BCN work for the counter? I also have a LM339 quad comparator.

That sounds like it'll work.

 

I'll post the schematic tomorrow. I used a CD4040 as the counter. With some modifications to the circuit, you could use CD4020 or CD4060 instead. CD4017 does not count high enough to be useful in this application. I used LM393 for the comparator, but you can use an LM339.
You also need a CMOS 555 and an op amp such as TL071 or TL072, and a handful of resistors, capacitors, diodes, etc.

__________________
Ron